INSTRUCTION MANUAL FT-301 • YAESU MUSEN CO., LTD. TOKYO JAPAN. TABLE OF CONTENTS (Page) GENERAL DESCRIPTION 1 SPECIFICATION 2 CONTROLS AND SWITCHES 4 REAR PANEL CONNECTIONS 6 PREPARATION FOR OPERATION 7 OPERATION 8 BLOCK DIAGRAM 14 CIRCUIT DESCRIPTION 15 AC POWER SUPPLY 24 FREQUENCY COUNTER UNIT 26 MAINTENANCE AND ALIGNMENT 28 PARTS LIST 37 GETTING ACQUAINTED WITH YOUR YAESU FT-301 After you unpack the unit, spend some time with this manual so that you have a good understanding of what each switch, knob and control is for. It will make your operation easier, possibly keep you from accidentally damaging something, and give you the basic information you need to put the unit to work in the way that will provide you maximum pleasure. Solid state equipment has enormous reliability. The statisticians have not yet developed life expectancies of many components simply because "end-of-life" cannot be established. Transistors and IC's just keep on going IF THE RATINGS ARE NOT EXCEEDED. If you observe some basic precautions, the FT-301 will provide you with many years of reliable operation. This manual is revised for the units produced starting with Lot No. 003 and the lots produced subsequently. Copyright of Yaesu Musen Co., Ltd. ALL SOLID STATE HF TRANSCEIVER FT-301 The model FT-301 is a precision built, all solid state, compact high performance transceiver of advanced design providing SSB (USB, LSB selectable), CW, AM and FSK modes of operation covering 160m - 10m bands. All circuits are fully transistorized with IC's and FET's for increased reliability. Instant operation, immediately after power is turned "on", provides tremendous convenience for mobile operation with minimum power consumption. The power amplifier employs power transistors with extremely good linearity and large heat dissipation capability. A wide band tuning system, with preset pass band tuning combined with wide band amplifier techniques, eliminates the necessity of final amp tuning for each band change. In addition, the double protection circuit ensures protection of the components from damage due to antenna mismatch or failures. The well established YAESU RF mu-tuning system is geared with a precision built vernier mechanism which provides bandspread tuning over a 16 kHz segment of the band per turn. The extremely stable VFO, combined with this vernier mechanism, permits precise tuning of the SSB signal. Rejection tuning utilizes an extremely sharp resonance characteristic of a crystal tunable over the entire IF pass band to reject interference. The active filter in the audio circuit limits audio spectrum sharply within 3 kHz, which improves readability of the signal being received by eliminating interferences. The noise blanker, with the latest noise detecting circuit, eliminates pulse type noise which has an extremely small amplitude for noise free reception. All features, such as VOX, semi-break-in CW with side tone, 25/100 kHz calibrator, noise blanker, speaker, fast/slow AGC, and clarifier are integral parts of the unit. The built-in RF speech processor will be operative with installation of an optional crystal filter. It will provide increased talk power improving the intelligibility at the receiving end. For mobile operation, fixed crystal controlled channels may be preferred. The FT-301 accepts 11 fixed channel crystals easily selectable from the front panel. The FT-301 offers wide versatility when used in conjunction with an external VFO, the FV-301. Plug-in modules are employed for the main circuit systems permitting an orderly arrangement of the circuit signal flow with excellent isolation. This allows simplified service and alignment, while assuring unsurpassed stability. When operated on DC (13.5V), the transceiver requires no external power supply, as is required for hybrid type HF transceivers. This compact, light weight, yet feature packed transceiver is well suited for base or mo.bile operation. The AC power supply, FP-301 or FP-301D, is available for base station set-up. Please read the operating manual carefully before attempting to operate the transceiver as it contains useful information which will assist you in achieving the maximum satisfaction from your YAESU FT-301. SPECIFICATIONS Frequency Range 160 m through 10 m (WWV/JJY, CB - - Receive only) Emission LSB, USB, CW, AM, FSK Power Input SSB 200 watts PEP CW 200 watts AM, FSK 50 watts (Slightly lower on 10 and 160 meter bands) Carrier Suppression Better than 40 dB Sideband Suppression : Better than 50 dB Transmitter Frequency Response : 300 Hz — 2700 Hz -6 dB Spurious Radiation : Less than -40 dB Distortion Products : Better than -31 dB Frequency Stability : Less than 100 Hz drift in any 30 minutes Antenna Output Impedance : 50 ohms unbalanced Sensitivity : 0.25 pV at S/N 10 dB Image Ratio : 1.9 — 21.0 MHz Better than 60 dB 28 MHz Better than 50 dB IF Interference : Better than -70 dB Selectivity : SSB 2.4 kHz at -6 dB 4.0 kHz at -60 dB CW, FSK 0.6 kHz at -6 dB 1.2 kHz at -60 dB AM 6 kHz at -6 dB 12 kHz at -60 dB Audio Output 3 watts at 10 % THD Output Impedance : 4 ohms Power Requirement DC 13.5 V negative ground Power Consumption TX(max) 280 watts ( 21 A) RX 12 watts (1.1 A) Size 280(W) x 125(H) x 370(D) mm Weight : 9 kgs approx. SEMICONDUCTOR COMPLEMENT Transistors: TA7120P 1 TP4011 1 2SA564A 1 2SC784R 5 T1L306 3 pPC14305 1 2SA695D 1 2SC1000GR 2 T1L308 3 pPC14308 1 2SB529D 1 2SC1383 1 2SC372Y 10 2SC1589 1 Diodes: 2SC373 8 2SD359D 1 1N60 24 BZ090 1 2SC536D 2 MPSA13 1 1S1007 12 WZ050 1 2SC711F 1 S10-12 2 1S1555 40 WZ090 7 2SC735Y 6 S2535 2 10D10 2 WZ110 1 2SC741 1 BY1-1 1 1S2209 1 YZ033 1 1S2236 1 Field Effect Transistors: 2SK19GR 13 3SK4OM 7 Thyristor: 1 3SK35Y 1 CWO1B 1 Integrated Circuits: Varistor: 34013PC 1 SN7490AN 1 MV5W LD3141 1 SN74160N 1 MC1496G 2 SN74560P 1 MSL980Y2 1 SN76514N 1 MSM5564 1 TA7060P 1 SN7400N 3 TA7089M 1 SN7404N 2 MODEL CHART FOR YAESU FT-301 SERIES FT-301 is supplied complete with cable, connectors, fuse and microphone as shown below. Model Power Input Frequency Readout FT-301S 20W Dial FT-301SD 20W Digital FT-301 200W Dial FT-301D 200W Digital Figure I CONTROLS AND SWITCHES 2) Figure 2 (1) TUNING KNOB The tuning knob varies receive and transmit frequencies over a continuous 500 kHz segment of a band. It is connected to the VFO through a precision built VFO drive mechanism. This vernier provides 16 kHz per turn allowing precise tuning for SSB signal. (2) MODE This switch selects the mode of operation: LSB (lower sideband SSB), USB (upper sideband SSB), CW (code operation), AM (amplitude modulation) and FSK (frequency shift keying). (3) REJECT This control varies resonance frequency of a crystal to reject interference. The control should normally be in the 9 o'clock position to avoid distortion of the received signal which may be caused by a sharp bandwidth. (4) BAND The eleven-position switch selects the desired band from 160m — 10m bands, plus JJY/WWV. The wave length of each selectable band is shown on the panel. (5) CHANNEL The channel switch selects any one of the 11 crystal positions used for fixed crystal controlled operation. This switch also selects the VFO for continuous tuning with the main tuning knob. (6) SELECT The select switch provides selection of the controll . Front Panel Controls & Switches ing VFO, either internal or external, or a combination for various splits. TNT The internal VFO controls both receive and transmit frequencies. EXT The external VFO 'controls both receive and transmit frequencies. RX-EXT . . . . The external VFO controls the receive frequency and the internal VFO controls the transmit frequency. TX-EXT . . . . The external VFO controls the transmit frequency and the internal VFO controls the receive frequency. Whenever the internal VFO is active, the sub dial lights up in red, indicating that the internal VFO is in operation. (7) RF/AF GAIN The RF gain lever allows manual control of the gain of the receiver RF and IF amplifiers. Clockwise rotation increases the sensitivity of the receiver. The AF gain knob control varies audio output level to the speaker and phone jack. (8) DRIVER/CLAR The drive lever controls the drive level in transmit. Clockwise rotation increases the transmit power output. The clarifier control varies receive frequency only up to 3 kHz on either side of the dial frequency affecting the transmit frequency. It is particularly useful in "net" operation where several participants may be transmitting slightly off frequency. The clarifier control functions in conjunction with the CLAR switch. When the CLAR switch is turned on, the CLAR indicator will light up, and the CLARIFIER is energized. The CLAR switch should normally be in the "off" position until the initial contact is made. The CLARIFIER control may then be used to zero-in and correct any drift on the received signal. The CLARIFIER control must also be set to "off" while calibrating the dial. (9) TUNE The tune switch peaks the receiver and transmitter circuits by means of a mu-tuning system coupled to a vernier mechanism. It provides continuous permiability tuning throughout the frequency range of the transceiver. (10) VOX GAIN Selects MOX, PTT and VOX (voice controlled operation) as well as adjusting the sensitivity of VOX operation. The PTT position provides pushto-talk operation. The MOX position provides manual transmit. It must be returned to PTT position for receiver recovery. (11) FUNCTION SWITCHES — (AGC, RF PROC, NB MARK, CLAR) AGC This switch selects AGC time constant — fast, slow and "off". RF PROC RF speech processor is placed into the circuit to increase the modulation power with the switch "on" position. NOTE: An optional crystal filter is required for this operation. NB Inserts the noise blanker into the (Noise IF circuit to eliminate pulse type Blanker) noise. CLAR . . . With the clarifier switch in RX position, the CLARIFIER control varies the receive frequency slightly. With the CLARIFIER switch in TXRX position, both transmit and receive frequencies are varied slightly by the CLARIFIER control. MARK . . The marker oscillator generates signals every 100/25 kHz for calibration of the dial with MARK switch "on". (12) POWER The power switch turns the transceiver "on" and "off". (13) PHONES The phones jack accepts the headphone plug. The internal or external speaker in the FP-301 (if used) is disabled whenever a headphone is plugged in. Use low impedance (4 ohm) headphones. (14) MIC The microphone jack has a four-pin connector and is used for microphone input as well as PTT control. (15) CALIB The CALIB knob shifts display frequency for calibration of the frequency display. (16) CLAR/FIX/VFO CLAR lights up when the CLAR switch is turned on, indicating the clarifier is in use. VFO lights up indicating tuning dial is in operation. FIX lights up indicating fixed crystal controlled channel is in operation and the VFO is disabled. (17) METER Functions as an "S" meter on receive and reads collector current of the PA on transmit. MIC PLUG MIC PTT SWITCH R Figure 3 Microphone Plug Connection cc KEY PLUG KEY Figure 4 Key Plug Connection REAR PANEL CONNECTIONS 87 6 Figure 5 (1) POWER DC power supply receptacle. For AC operation use FP-301 power supply with built-in speaker. When the transceiver is used together with the FP-301, the speaker in the transceiver is disabled. (2) EXT VFO - interface for external VFO unit. Supplies power to the FV-301, external VFO unit (if used). (3) KEY key jack for code operation. Keying is through closure of a +5V DC line. If electronic keyers are used, polarity should be checked. (4) ACC - accessory socket. Provides +13.5V for control of an external relay. (5) ANTENNA - coaxial connection for antenna. (6) PO ADJ - meter sensitivity adjustment for relative power output reading. (7) OUT - RF output is obtained from the driver stage for final linear amplifier at this jack. This output may also be used for optional equipment such as a 6 or 2 meter transverter. (8) IN - input jack for a low pass filter. Booster amplifier is connected here. PREPARATION FOR OPERATION ANTENNA The transceiver is designed for use with a resonant antenna having an impedance of 50 ohms resistive. Any of the common antenna systems designed for use on the HF amateur bands may be used as long as its impedance is 50 ohms. If an antenna other than 50 ohms is used, a suitable antenna matching device should be used between the antenna terminal and the transmission line to assure proper matching of the antenna to the transceiver. In either case, the antenna must be properly adjusted so that SWR becomes less than 1.5. A high SWR will cause reduction in power due to overloading of the power transistors. POWER SUPPLY The transceiver will operate satisfactorily from any 13.5V DC negative ground battery source or equivalent. For mobile operation, connect the red DC power cable to the positive and the black to the negative side of a battery. For base station installation, use of the FP-301 AC power supply with built-in speaker is recommended. CAUTION The antenna matching is the most critical part of the transceiver installation, especially in mobile operation, as the installation of antenna is often confined. Peak performance of the equipment will largely depend upon how well the antenna is matched to the transceiver. It is very important that the antenna has a fairly close to 52 ohm non-reactive load. An automatic drive control circuit will work to reduce the drive when the SWR is high. The power output is decreased as much as 50% when the SWR is 2:1. Refer to the following: SWR POWER OUTPUT 1.0 100% 1.5 80% 2.0 50% 3.0 20% INSTALLATION To achieve maximum performance, location of the transceiver installation is very important. Allow adequate space on all sides of the unit to assure proper ventilation around the cabinet. Avoid installation in the following places: (a) Under direct sunlight or near a heating system. (b) Humid areas. (c) Dusty places. (d) Poorly ventilated areas. (e) Unstable places. PERMANENT DAMAGE WILL RESULT IF IMPROPER SUPPLY VOLTAGE AND POLARITY ARE APPLIED TO THE TRANSCEIVER. WARRANTY DOES NOT COVER THE DAMAGE CAUSED BY IMPROPER SUPPLY VOLTAGE AND POLARITY. INITIAL PREPARATION Prior to initial operation of the transceiver, be sure to read the operating manual carefully to familiarize yourself with the proper operation of the controls. Simulate operation without connecting the power cable until you become thoroughly familiar with all the functions of the knobs and switches. Connect a non-reactive dummy load (50 ohms) to the antenna terminal (5). The YP-150 dummy load with power meter is suitable for tune-up practice. NEVER TRANSMIT WITHOUT HAVING PROPER ANTENNA OR DUMMY LOAD CONNECTED TO THE TRANSCEIVER, OR SERIOUS DAMAGE MAY OCCUR TO THE UNIT. Connect the microphone furnished with this transceiver or any other low impedance dynamic microphone in the 400-600 ohm range. Refer to Fig. 3 for the microphone plug connection. For CW operation, insert the plug into the key jack (3) on the rear panel. Refer to Fig. 4 for the key plug connection. OPERATION Receive Operation Connect the power cable supplied to an appropriate power source, such as a car battery or FP-301 AC power supply. Make sure that the power switch of the transceiver is turned off while making the wiring connections. Connect an antenna to (5) using the connector supplied. Do not plug or unplug the power cable while the unit is on, or serious damage may result from transient voltage pulses. Follow the steps below: (1) Preset the controls and switches as indicated - POWER OFF VOX GAIN PTT MODE DESIRED MODE REJECT 9 O'CLOCK POSITION AGC RF PROC OFF NB OFF CLAR OFF DRIVE FULLY CCW POSITION MARK OFF AF GAIN FULLY CCW POSITION RF GAIN FULLY CW POSITION CLARIFIER 12 O'CLOCK POSITION DIAL DESIRED OPERATING FREQUENCY TUNE DESIRED BAND SEGMENT SELECT INT BAND DESIRED BAND CHANNEL VFO NOTE: It is customary to use LSB below 7 MHz, and USB above 14 MHz. (2) Turn the power switch "on" (if the AC power supply FP-301 is used, turn on the power switch of that unit as well). (5) Turn the dial to the desired signal of frequency. (6) Adjust the AF GAIN control to the desired level. (7) Readjust the TUNE control after setting the dial for maximum received signal or noise if no signal is present. (8) Use the CLARIFIER if the received signal is drifting. This control provides a means of offsetting the receive frequency approximately 3 kHz to either side of the transmitting frequency. The CLAR indicator will light up whenever the clarifier is in use. (9) When pulse type noise interferes with reception of the signal, turn the NB (Noise Blanker) on. It will eliminate the noise effectively enabling you to enjoy noise free reception. (10) When interference by another signal exists, adjust the REJECT control to tune out interfering signal. NOTE: 11 meter band is set for receive only. (11) When a headphone is connected to the PHONE jack, the internal speaker is disabled. Use headphones with 4 — 8 ohm impedance. RECEPTION OF JJY/WWV (STANDARD SIGNAL) Reception of the standard signal requires an optional fixed frequency crystal to receive 5 MHz. The signal is heard with zero beat regardless of the dial setting. BAND JJY/WWV TUNE 2 OF THE UNIT SCALE MODE LSB (3) The meter will light up and the operating frequency will display in the dial window. As you turn the AF GAIN control clockwise, noise or signal will be heard. (4) Adjust the TUNE control to the maximum noise or signal level. - 8 - - % \ N N \ ? V 10 % 1 1 .., I I I / / / — — —. 'I I / 20 I 1 I / / I IF— I k30 1---- [ ":::--% ..... --- "----__, 40 50 60 —3 —2 —13 fo=9000kHz REJECTION TUNING Figure 8 Tunable Rejection Tuning PRESETTING FOR TRANSMIT It is necessary to preset the transceiver regardless of mode of operation. (1) Set the controls and switches to the positions indicated. MODE CW RF PROC OFF DIAL DESIRED FREQUENCY TUNE DESIRED BAND SEGMENT SELECT INT BAND DESIRED BAND DRIVE FULLY CCW CHANNEL VFO (2) Turn the power switch "on". (If the AC power supply FP-301 is used, turn on the power switch of that unit too). (3) By setting the VOX GAIN to the MOX position, the FT-301 will transmit until the switch is returned to the PTT position. (4) Rotate the DRIVE control until the meter indicates 10 amps, then adjust the TUNE control for maximum meter deflection. The meter indicates 15 amps at full input. (5) If a dummy load or an antenna with SWR less than 1.5 is used, you may increase the DRIVE control until the maximum power output is attained. (6) If the SWR of the load or antenna system is higher than 1.5, the power output automatically decreases to protect the final amplifier transistor. (7) With an appropriate load (or antenna) the meter will normally read 15 when the DRIVE is fully clockwise. (8) Return the VOX GAIN control to the PTT position. NOTE: With the key plugged into the rear key jack, transmitter does not load up unless key is down. SSB OPERATION After completion of presetting the transceiver, follow this procedure to transmit in SSB. (1) Connect the mike plug to the MIC jack. (2) Place the MODE switch to the USB or LSB position, as desired. (3) Turn the DRIVE control fully clockwise. (4) Speak into the microphone while pressing the PTT switch on the mike. The meter should indicate V3 —V2 as compared to the CW position. (5) If the meter reading does not fall into the specified range, adjust the MIC GAIN control (located inside the cabinet) for proper reading of the meter. (6) By releasing the PTT switch, the unit will return to receive mode. (7) By turning the RF PROC switch on, the RF speech processor is inserted into the circuit. (The optional crystal filter must be installed). The RF speech processor will increase talk power which is particularly effective in DX contacts. For local contacts, operation without RF speech processor is recommended. The RF Processor increases talk power to cut through the pile-ups without addition of a linear amplifier. CW OPERATION After completion of presetting the transceiver follow the procedure to transmit in CW. Keying is accomplished by closing the DC 5V line to ground. The current that flows in the KEY is around 6mA. Use caution when an Electronic Keyer is used, to be sure polarity reversals or excessive voltages do not cause damage to one or both units. (1) Insert a properly wired key plug into the KEY jack on the rear panel. See illustration on Pages. (2) Set the MODE switch to CW position. (3) Closing the circuit will transmit CW when the VOX GAIN control is placed on the MOX position. The meter reading should be zero when the key is open, and 15 when the key is closed. The receiver will be disabled until the MOX switch is returned to PTT. (4) You may monitor the keying. (The monitor circuit is built in the VOX unit). (5) Repositioning the VOX GAIN control to the PTT position will return the unit to receive. Figure 9 RE Processor "OFF" Figure 10 RF Processor "ON" RECEIVE-TRANSMIT SWITCHING There are several ways to activate the unit for receive-transmit switching. MOX (MANUAL) OPERATION Setting the VOX GAIN control to MOX or PTT position will transmit or receive respectively. This is convenient for continuous transmit on RTTY, or for transmitter adjustment. PTT (PUSH-TO-TALK) OPERATION The PTT switch accompanied by microphone is used for keying. Pressing the PTT switch will transmit and releasing will receive. The VOX GAIN control must be set to the PTT position. VOX (VOICE CONTROLLED) OPERATION OR CW BREAK-IN VOX or CW break-in operation is available to the operators as follows: (1) For SSB VOX operation, adjust the VOX GAIN control on the front panel until your voice actuates the transmitter while speaking normally into the microphone. (2) Set the ANTI TRIP control located inside the cabinet to the minimum point in order to prevent the speaker output from tripping the VOX circuit. Do not use more VOX GAIN or ANTI TRIP gain than necessary. (3) Adjust the DELAY control for a suitable release time. (4) For CW operation, break-in is available by use of the VOX circuit. As you stop keying, the unit will automatically return to receive, and you can hear the other station between your dots and dashes. Adjust the DELAY control for suitable release/delay time. (3) If an optional CW filter is installed, the calibration should be taken by reading the maximum S meter deflection instead of zero beat. SELECT SWITCH The SELECT switch provides selection of a companion FV-301 external VFO, which is very useful in DX work because it provides the operator with split frequency capability. TNT The internal VFO controls both receive and transmit frequencies of the FT-301. EXT The external VFO controls both receive and transmit frequencies of the FT-301. RX The external VFO controls the receive frequency of the FT-301 and the internal VFO controls the receive frequency. TX The external VFO controls the transmit frequency of the FT-301 and the internal VFO controls the receive frequency. The FIX indicator will light up when a crystal controlled channel is used. CRYSTAL CONTROLLED OPERATION AND CRYSTAL FREQUENCIES Fixed frequency crystals must be placed in the crystal holders on the FIX UNIT located inside the cabinet in order to operate on a fixed frequency within a band. The crystal sockets correspond to CH-1, CH-2 CH-11, counting from the one nearest the front panel. The last one, 12th socket, is an auxiliary. When the CHANNEL switch is in the VFO position, the internal VFO is controlling the transceivers, and when the switch is on any other position between 1-11, the corresponding fixed crystal frequency controls the transceiver. CALCULATION OF CRYSTAL FREQUENCIES The crystal holders accept standard HC-25/U type crystals. All crystal frequencies must fall between 5,000-5,500 kHz. The correct crystal frequency for any desired operating frequency may be determined by using the following formula: Fx = F1- Fo where Fx : crystal frequency F0: operating frequency F, : constant taken from Table 1 Figure I I If ordering non YAESU fixed crystals from a crystal manufacturer, be sure to specify the crystal correlation information shown below, in addition to the frequency of the crystal. TYPE HC-25/U LOAD CAPACITANCE . . • 30 PF SERIES RESISTANCE . • 25 ohms or less STATIC CAPACITANCE • 7 PF or less DRIVE LEVEL 5 mW BEFORE BEGINNING ANY PROCEDURE DESCRIBED, READ THE INSTRUCTIONS THROUGH COMPLETELY AND KNOW AND UNDERSTAND IN ADVANCE WHAT IS BEING ACCOMPLISHED. CIRCUIT DESCRIPTION The block diagram and the circuit description that follows, will provide you with a detailed understanding of this transceiver design. Computer type plug-in modular construction is used throughout the transceiver for RF isolation, service and alignment purposes. The transceiver consists of a premix type single conversion system with a 9 MHz IF for all modes of operation. RECEIVER The RF input signal from the antenna is fed to pin 4 of the RF unit (PB-1443) through RL-1 (relay), trap T1401/C1413 in the trimmer unit and T1, the permiability tuned RF input coil. RF UNIT (PB-1433) The incoming signal is amplified by the RF amplifier Q102 3 SK4OM FET, and then fed to the gate of the mixer Q103 3 SK4OM where the input RF signal is heterodyned with a local signal delivered from pre-mix circuit (PB-1439), producing an IF signal of 9 MHz at pin 11, through T102. The input and output of the RF amplifier are permiability tuned circuits which provide high sensitivity with excellent rejection of unwanted out-ofband signals. FILTER UNIT (PB-1435) The IF signal received at pin 2 is passed through the monolithic filter XF-301 which has a ฑ10 kHz Figure 13 RF Unit (PB-1433) Figure 14 Filter Unit (PB-1435B) bandwidth, providing additional selectivity. enough delay time is designed into the filter circuit to match the timing with the noise blanker output. The noise blanker diode D3,1, 1S1007, is placed between the two IF amplifiers Q_30i , 2SC784R, and Q302, 2SK19GR. The noise blanker diode D301 functions as ON/OFF switch which is controlled by the noise blanker driver Q3 „ , 2SC372Y. The output from the source of Q302 is passed through the SSB or CW (option) filter which has been selected by diode switches D303 —D306, 1S1007, depending on the mode of operation. The filtered out clean IF signal is transferred to the IF unit (PB-1436) through pin 17. IF UNIT (PB-1436) The IF signal from pin 17 of the FILTER UNIT appears at pin 14 of the IF UNIT (PB-1436). The signal is further amplified by Q401, 3SK40M, and Q402, 2SC784R. The output from Q402 is coupled to a rejection tuning circuit to eliminate the interference, then supplied to the AF unit from pin 5. A portion of the IF signal is picked up by C408 , 10 PF, and is rectified by D407, 1S1555 to produce AGC voltage. It is further amplified by the DC amplifier Q404 and Q405 . The DC output voltage is then fed to the gates of Q102, RF amp, and Q401 , IF amp to control the gain of these stages for AGC purposes. The AGC voltage produced at the emitter of Q405, 2SC373 is used for S-meter indication. The RF GAIN control on the front panel varies the AGC voltage, applied to the base of Q404 2SC373 providing manual control of the gain of the RF and IF stages. Also, assembled onto the IF UNIT board is a 6V regulated power supply for the CARRIER, VFO, FIX, and LOCAL circuits. DC 13.5V is applied to the collector of Q408, 2SC1383. The base voltage of Q408, 2SC1383 being fixed by the zener diode D409 WZ 090, DC 8.5V is generated from the emitter, which is further stabilized by Q407, regulator IC TA7089M to produce 6V DC. Q406 and Q410, 2SC735Y are transistor switches. On receive, Q406 conducts to supply 6V to an external receive VFO through pin 8. On transmit, Q410 conducts to supply 6V to an external transmit VFO through pin 16. AM UNIT (CPB-1556) The signal from IF unit is also fed to AM unit from pin 12 for AM detection. The signal is amplified by Q2005, 2SK19GR and applied to a diode detector consisting of D2006 and D2007, IN60. Detected --2006 2SC372Y and audio signal is amplified by 0 fed through AUDIO GAIN control to the AF unit. Figure I 5 IF Unit (PB-1436B) Figure 16 AM Unit (PB-1556) AF UNIT (PB-1437) The 9 MHz IF signal is delivered to pin 2 from PB-1436. A balanced demodulator circuit consisting of D503 — D506, 1S-1007 demodulates the 9 MHz IF signal into audio using the appropriate USB or LSB frequency being applied from Q501, 2SK19GR, carrier oscillator and Q502 2SC372Y, buffer amp. The demodulated audio then goes through relay contacts to an active low pass filter, , 2SC1000GR. The audio spectrum is shaped by the decay curve so that it has an attenuation slope of —3dB at 2.3 kHz and —6dB at 2.6 kHz. The filtered audio is amplified by Q505, 2SC1000GR, and the signal travels from pin 8 to pin 11 through the AF GAIN control, providing manual audio level control. The audio signal returned to pin 11 is amplfied by Q506, 2SC711A, Q507, 2SA695D, and finally by OTL power amplifier Q508 , 2SD359D and Q509, 2SB529D producing a maximum of 3 watts audio output into the speaker. The carrier oscillator Q„, , 2SK19GR is followed by a buffer amplifier Q502, 2SC372Y. It oscillates either 8998.5 kHz with X502 or 9001.5 kHz with X501 depending on the mode of operation. The crystal selection is made by diode switches D501 and D502 , 1S1555. The carrier is then injected into the balanced demodulator through VR501. The diode D502 conducts to activate the crystal for 8998.5 kHz, used for LSB on 160, 40, 20, 15, 10 and USB on 80 meter band on both transmit and receive -- 8998.5 kHz is also used for CW receive on all bands. The diode D501 conducts to activate the crystal for 9001.5 kHz for USB on 160, 40, 20, 15, 10 and For CW transmit, the oscillator in the IF UNIT (PB-1436) oscillates at 8999.3 kHz carrier frequency. NB UNIT (PB-1434) A portion of unfiltered 9 MHz IF is fed to pin 5, and appears at Q204 3SK40M, where the 8545 kHz signal generated by X201 and Q20'7, 2SK19GR is mixed with the incoming IF signal to produce 455 kHz. The 455 kHz is then amplified by Q205 3SK40M. When a carrier, or noise free modulated signal is received, the 455 kHz signal with its corresponding strength, is rectified by D201 and D202 to charge C221 . There is no discharge loop for C221 , therefore, signals which exceed the charged voltage established by the reference voltage on C221 will not pass through D201 and D202 1N60. Accordingly, there will be no voltage drop across R226, and Q206 , 3SK40M, will conduct as the gate voltage approaches zero potential. When Q206 conducts, the drain voltage at pin 2 of printed board will drop. The drain of Q206 is directly connected to the base of Q3„ , 2SC372Y in the FILTER UNIT. As the drain voltage of Q206 drops, the base voltage of Q303 drops, as well, which will turn off Q304. The collector voltage will then increase and it will produce a forward bias to D301 . As D301 conducts, the signals will pass normally through the circuit. When pulse- type noise, which exceeds the charged reference voltage established by C221 is received, D201 and D202 will permit negative going pulses to turn Q206 off. The drain voltage will rapidly increase as it turns off. As the drain voltage increases, Q303 will become "on" and the collector voltage will decrease. Accordingly, D301 , 1S 1007 will be biased to block the signal. Whenever pulse type noise is received, it will blank off the signal passage momentarily. TRANSMIT CIRCUIT Audio signals pass through the MIC jack, J8 and go to pin 4 of the AF UNIT through VR19o1, MIC GAIN control. AF UNIT (PB-1437) From pin 4, the audio signal passes through Q503, LD3141, is amplified, then is applied through RL501 into a balanced modulator D,„ through D506, 1S1007, where the carrier generated by Xsoi or X502 is modulated by the audio. The output becomes a 9 MHz DSB signal and is fed to the IF UNIT. AM UNIT (PB-1556) For AM (amplitude modulation), the microphone signal is fed through a level set potentiometer VR2002 to a microphone amplifier Q2003, TA7120P which is controlled by Q2004,2SC372Y. Q2004 supplies the base voltage to Q2003 when the MODE switch is set to an AM position. Carrier oscillator, Q2001,2SK19GR generates a crystal controlled carrier frequency of 8999.3 kHz. The carrier and microphone signals are fed to an AM modulator Q2002, , 3SK40M. The amplitude modulated signal is fed through pin 2 to pin 14 of NB unit and amplified by Q208 , 3SK35Y. The carrier frequency is shifted 170 Hz for FSK and the signal is then applied through Q2002 which works as a buffer amplifier to Q208 in the NB unit. IF UNIT (PB-1436) The 9 MHz DSB signal enters into pin 5 and is amplified by Q403, 2SK19GR. It then goes into the FILTER UNIT from pin 14. The function of Q409 2SK19GR is to oscillate 8999.3 kHz carrier for for CW transmit. The carrier is amplified by Q403, 2SK19GR and then goes into pin 17 of the FILTER UNIT from pin 14 of the IF UNIT. FILTER UNIT (PB-1435) In the FILTER UNIT, the DSB signal is converted into SSB by the filter, XF-303 by removing the unwanted sideband. From pin 6 the SSB signal is fed into pin 12 of the NB UNIT (PB-1434B). The signal is fed to the speech processor circuit which is built into this NB unit. NB UNIT (PB-1434) When the RF PROC switch is "OFF", the SSB signal entered at pin 12 is amplified by Q201 , 2SK19GR and then is applied to the XF-201 filter which is optional. When the RF PROC switch is "on", the SSB signal is amplified by Q202, 2SK19GR and is further amplified by the limiter IC, Q203 T A 7060P where the • signals that exceed the clipping level are sliced out. The clipping level may be adjusted by VR203, VR201 and VR202 to adjust the signal level differences caused by the PROCESSOR "on" or "off". This highly clipped SSB signal is then followed by a selective filter XF-201 to remove RF harmonics and out of band intermodulation products that result from signal clipping. The filtered out clean signal is amplified by Q208 , 3SK35Y and fed to pin 1 of the RF UNIT (PB-1433). RF UNIT (PB-1433) The signal from pin 1 is applied to the double balanced mixer Q101, , MC1496G where the SSB signal is heterodyned to the desired RF frequency by injection of the local signal which is supplied from the PRE-MIX UNIT (PB-1439) through P101. The RF output from Q101 passes through T2, then into the two stage amplifier on board PB-1433, Q104,2SC784R and Qios , 2SC741 to drive the lOW power amplifier, PB-1443. The transformers T2 and T3 are permiability tuned type which are used for both receive and transmit to provide unsurpassed selectivity in both modes. In CW operation, the emitter voltage of Q104 and Q105 are controlled by the keying switch transistor Q106,25C735Y. A flip-flop circuit consisting of Q,„ , SN7400N, is employed to shape perfect waveforms for keyclick free CW operation at any speed. Q106 and Q107 also function as the protection switch when the protection circuit on the LPF UNIT (PB-1445) is activated for any reason, such as excessive SWR, short, etc. The exciter output from pin 17 of the RF UNIT (PB-1433) is amplified by the driver Q1101, 2SC1589, to drive the push-pull power amplifier, Q1102 and Q1103 S10-12, to produce a nominal power output of 10 watts. A non-resonant, broad band type power amplifier, utilizing ferrites and the most advanced circuitry is used to eliminate the nuisance tuning process usually required for each band. These techniques also protect the power transistors from erroneous tuning procedures. The zener diode D1101 YZ033 sets the bias for Q1101 — Q1103 at exactly 3V. The silicon diodes D1102 and D„03, 10D10 are mounted on the power transistors Q1102 and 0 to compensate bias, as well as to protect them from thermal runaway. The negative feedback circuit delivers a clean signal to the following booster amplifier. (P8-1443 IOW AMP UNIT) Figure I 9 10W Amp Unit (PB-1443) BOOSTER UNIT (PB-1444) The booster unit is built in the heat sink which is attached to the rear panel of the transceiver. The 10 watts signal is fed through an input network to a pair of S-2535, Q1201 and Q1202 which are connected in push-pull amplifier configuration. This circuit is a non-resonant broad band type amplifier covering 160 through 10 meter bands. A part of output energy is feedbacked in negative polarity to the input circuit. Q1203 BY 1-1 is used to sterilize the bias voltage to the final amplifier. The amplified signal is fed into the two stage low pass filter consisting of Li,„ , L1206 , C1214 C1215 and C1216 to alternate the fre quency beyond 35 MHz. The RF output from the secondary winding of the output transformer is fed into the low pass filter, composed of L1103 L1104 , C1110, C1111 and C„12 to eliminate frequencies beyond 35 MHz. The jacks, J2 and J3, are connected by a jumper wire for the 10 watts model. The band switches, S2 B1 and S2 B2, select the proper low pass filter network for the band in use. The signal passes through T130„ an output detector, and the antenna relay (RL1) to the antenna terminal, J1. T1301 detects the forward and reflected waves. The forward wave is rectified by D1303, 1S 1555. When the forward power exceeds safety level, it will trigger the thyristor D1301 , CWO1B which will, in turn, shut down Q1301, 2SC735Y and the protection relay RI-1301 will be released. When the relay opens, the voltage on the output side of Q107, SN7400N on the RF UNIT (PB-1433) becomes low and Q106 25C735Y will turn off. As Q106 turns off, the emitter circuit for Q104 , 2SC784R and Q105, 25C741 will become wide open and these transistors will turn off. As a result, no signal will be delivered to the power amplifier. The forward wave is also rectified by D1306 and D1307, 1S 1555 to obtain ALC voltage. The ALC voltage is fed back to the base of Q208 53SK35Y in the NB UNIT to control the gain of that stage. At peak transmission, the ALC voltage will reduce the gain of Q208 to prevent overloading or distortion. The output of the reflected wave from T1301 is rectified by D1304, 1 S 1555 to obtain ALC voltage. When there is an excessive amount of reflected power due to an antenna mismatch, the reflected wave is rectified by D1308,1S 1555 and the voltage is used for ALC to reduce the gain of Q208 which will also reduce the corresponding input level to the power transistors. BLANKING UNIT (PB-1451) While the protection circuit is activated, Q1301 will be off and there will be no voltage drop across the relay coil connected to the emitter. This lack of emitter voltage (DV) is used to activate the BLANKING UNIT. Under normal operating conditions, the output of the bi-stable Q1901 9 TP4011 is in HIGH level which will turn Q1902, 5 MPSA13 on allowing current to When the protection circuit is activated, the input to the BLANKING UNIT becomes zero volts. The bi-stable will then oscillate to blink the meter lamp indicating existence of problem and alerting the operator to this fact. Also on the board are the MIC GAIN control VR1901 and the clarifier zero adjustment pot, VR1902 • Figure 22 Blanking Unit (PB-1451) VOX UNIT (PB-1438) (1) VOX (Voice Controlled Operation) A portion of the mike input is delivered to pin 10 of the VOX UNIT. The signal is amplified by Q601 and Q602 , 2SC373, is then rectified by D601, 1N60 to produce positive DC at the base of Q603 2SC373 causing it to conduct, thus reducing the voltage at pin 6 of Q604 SN72560P. The output at pin 4 will be zero which will then actuate the VOX relay, RL1. Q604 is a level detector having a hysteresis characteristic and a transistor switch built in. (2) ANTITRIP CIRCUIT The ANTITRIP circuit provides a bucking voltage to prevent the speaker output from tripping the transceiver into the transmit mode. The receiver audio output is connected through the ANTITRIP potentiometer, VR„„ to the antitrip amplifier, Q605 , 2SC372Y and rectified by D602, 1N60 to pro duce positive DC voltage at the base of Q606, 5 2SC373. When there is no antitrip input Q606 will be off as will Q607 , 2SA564A. On receive, signal comes into pin 6 of the VOX UNIT and 0 and Q607 will conduct causing the collector voltage of Q607 to increase, thus maintaining Q604 in an off state on receive mode. This provides the necessary antitrip threshold. Input signal from the mike will turn Q603 on, discharging C6 „ , yet the input of Q604 will be kept in HIGH level preventing the transceiver from tripping, thus providing very stable VOX operation. As the input to the mike stops, Q603 will become off and C613 will be charged according to the time constant set up by VR602 and R623 . When the input voltage of Q604 reaches the preset level, the output will become off, thus returning the unit to receive mode. The VOX GAIN control (VR1) on the front panel provides adjustment for relay sensitivity, and VR601 for antitrip sensitivity. Relay hold time is determined by the delay control, VR602 . The tone oscillator, Q609, 2SC373 operates when the MODE switch is in the CW position. It is a phase-shift oscillator operating at approximately 800 Hz. The tone output is activated by the keying circuit through the emitter of Q609 and coupled to the base of Q602, 2SC373 for break-in CW operation. The output is also fed to the base of Q506 in the AF UNIT through VR603 for CW monitoring. The VR60 adjusts the sidetone level. (3) MARKER CIRCUIT Located on the VOX UNIT (PB-1438), the crystal marker generator, Q610. generates a basic 1 MHz signal, with its output fed through a buffer amplifier Q611 2SC735Y to a frequency divider Q612, 34013PC. The divider output provides either 100 kHz or 25 kHz marker signals as selected by S601 for dial calibration of the FT-301. The marker signals are then fed to the antenna input from pin 3 of the VOX UNIT' TC - -601 is used to set the 1 MHz basic oscillator precisely to WWV or JJY. Q608, 2SC372Y is to stabilize the 8.5V DC power supply to the VOX and sidetone generator. VFO UNIT (PB-1440) A modified Colpitts type oscillator is used to generate a 5.0 MHz to 5.5 MHz signal to produce a stable 500 kHz tuning range. The frequency is varied by VC.,801 which is geared to a precision built dial tuning mechanism. The VC801 consists of two sections. The sub blades compensate the capacitance variation of the main blades caused by temperature changes. Frequency drift is minimized through the use of a temperature compensation circuit utilizing a differential trimmer capacitor, TC801. Figure 24 VFO Unit (1440) The varactOr diode D„, , 1S 2236 is in series with C807, and the combination is in parallel with VC-801 - By closing the clarifier switch S1805 , a portion of the regulated 6V is applied, shifting the frequency ฑ3 kHz, depending on the setting of clarifier control VR5. The VR1902 on PB-1451 blanking unit is used to establish the zero set for the clarifier. The VFO output signal is fed through the amplifier/buffer stage, Q802, e 2SK19GR and Q803, 2SC372Y, and the low pass filter to the OUT terminal. From there, the signal goes to the PRE-MIX UNIT. FIX UNIT (PB-1447) In addition to normal VFO operation, 11 crystals may be used for crystal controlled operation. The selector switch located on the front panel of the transceiver selects the crystal in use. The trimmer capacitors, TC1501 — TC„,, , are for fine adjustment of each crystal frequency. Figure 25 FIX Unit (PB-1447) The FIX channel crystal oscillator Q1501 2SK19GR oscillates at the frequency of the crystal selected by the CHANNEL switch. The frequencies of the crystals must fall between 5.0 MHz — 5.5 MHz. The crystal signal is fed through the amplifier/ buffer stage Q1502 2SC372Y and a low pass filter to the OUT terminal on PB-1447 (FIX UNIT). PRE-MIX UNIT (PB-1439) CRYSTAL UNIT (PB-1441) & BPF UNIT (PB-1442) The FT-301 transceiver utilizes a unique technique of premix to minimize the signal distortion. The VFO signal is premixed with a local crystal oscillator signal and then fed to the mixer stages of the transmitter and receiver. Crystal oscillator ()„, , 2SC372Y produces a heterodyne signal selected by the band switch. The signal is fed to the double balanced mixer Q201 , MC1496G where the signal is mixed with a signal from the VFO or FIX oscillator to produce the local signal for each band. The local signal is then fed to the wideband buffer amplifier stage Q.,„ , 2SK19GR, Q704 and Q703, 2SC784R through the bandpass filter unit (PB-1442). The local signal or the premix output is obtained at J701. For 80 meter, the VFO signal is directly coupled, through the buffer stage, to the transmitter and receiver mixer in the RF unit. For reception of WWV, a 13.9985 MHz crystal is used for the crystal oscillator Q702 . The 5 MHz standard signal may be heard with zero beat without use of the VFO. The BAND switch must be set to WWV/JJY and the MODE to LSB. Figure 27 Crystal unit (PB-1441) The frequency relation of the FT-301 is shown in Table 2. Band Frequency Crystal Premix out 160m MHz MHz 1.5-2.0 MHz 16.0 MHz MHz 10.5-11.0 80m 3.5— 4.0 5.5— 5.0 40m 7.0— 7.5 21.5 16.0-16.5 20m 14.0-14.5 28.5 23.0-23.5 15m 21.0-21.5 35.5 30.0-30.5 Ilm 27.0-27.5 41.5 36.0-36.5 10mA 28.0-28.5 42.5 37.0-37.5 10mB 28.5-29.0 43.0 37.5-38.0 10mC 29.0-29.5 43.5 38.0-38.5 10mD 29.5-30.0 44.0 38.5-39.0 JJY 5.0 13.9985 13.9985 Table 2 WO: 5.0-5.5MHz IF: 9MHz A study of the block diagram on Page 12 will also prove useful in tracing the various signal paths through the transceiver. PI FP-301 Figure 29 FP-301 Circuit Diagram AC POWER SUPPLY The FP-301 AC power supply is designed for base operation of the FT-301 SSB transceiver. However, this high current regulated power supply can also be used for other purposes such as when there is a requirement for a regulated 13.5 volt DC supply from AC power sources. MODEL SPECIFICATIONS FP-301 Output 13.5V DC — Max 25 Amps for FT-301 or FT-3D ID FP-301D Output 13.5V DC — Max 25 Amps for FT-301 or FT-301D with automatic ID and digital clock CIRCUIT DESCRIPTION The power supply is designed to operate from either 100, 110, 117, 200, 220 or 234 Volts AC, 50 or 60 Hz. A transformer is energized by two primary windings which can be connected in series for 200, 220 and 234 Volts and in parallel for 100, 110 and 117 Volts operation. A secondary output voltage is rectified by a full wave bridge rectifier consisting of diodes, D, , D2 , D3 and D4 12CD12. The rectified DC voltage is stabilized by a voltage regulator consisting of Q, through Q4, 2SD114Y, Q5 2SD235 and Q101 , TA7089M. The regulator Q101 works as a current limiter to protect the over current failure of the regulator transistors. The FP-301D has a built-in digital clock and automatic identification circuits. The digital clock displays the time in hours, minutes and seconds and is synchronized to the supply voltage frequency, 50 Hz or 60 Hz. The frequency can be selected by changing the internal windings. The display can be selected for either a 24-hour or 12-hour system with a switch at the front panel. The call sign for automatic ID will be programmed into an integrated circuit by our authorized dealer at a minimum cost. A frequency counter is incorporated for accurate and easy frequency readout by the display diode. The frequency readout unit consists of a counter unit, frequency converter unit and a display unit by LED (Light Emitting Diode) to display operating frequency in the dial window. The counter device utilizes LED to display the lowest digit of 100 Hz, however, the counter unit counts to 10 Hz to avoid the annoyance of flicker of the last digit. The diode matrix circuit selects MHz display which corresponds to the setting of the BAND switch. The VFO frequency of 5 to 5.5 MHz is connected to 13.0 — 13.5 MHz and the counter counts this frequency. COUNTER MIXER UNIT (PB-1541) The heterodyne oscillator Q2202, 2SK19GR oscillates at 18.5 MHz crystal frequency. A varactor diode, D„„ , 1S2209 is connected in series with a crystal and shifts the crystal frequency to calibrate frequency from front panel. The varactor diode voltage is supplied through the potentiometer marked CA4B. The oscillator output is fed through a buffer amplifier Q2204 , 2SK19GR to the mixer, Q2203, SN76514 where the incoming VFO from pin 5 of printed board is heterodyned to 13.0 — 13.5 MHz signal. The diode matrix circuit consists of a read memory IC, Q2201, MSL-980Y2 and diodes D2201 — D2210, 1N60AM for preset counter adding 500 kHz to the VFO frequency and for 7 MHz, 5 MHz, 10 MHz and 20 MHz display. The diodes are grounded by the BAND switch in order to make BCD input terminal "L". The matrix circuit is so composed that unnecessary BCD code is grounded as BCD input of Q2101 Q2106 are "H" level. 02106 TIL308 is only used to display 1 or 2 for 10 MHz and 20 MHz so that A or B of BCD input terminal is set to "H" through inverter Q2112, / SN7404 for 10 or 20 MHz display. The clock signal is oscillated by C MOS IC Q2204 MSM5564 which also contains 18 stages of the binary counter. The 655.36 kHz signal is then divided by the binary counter into a 5 Hz signal which is amplified by a buffer amplifier 0 2SC373 and is used as a gate signal for counter gate 2. DISPLAY LOGIC UNIT (PB-1542) The heterodyned 13.0 — 13.5 MHz signal is wave shaped and inverted by 0 -,2110 SN7404N and then fed to gate 1 of Q2109, SN7400N. Gate 1 closes when the BAND switch is set to JJY/WWV position but opens for other positions. Gate 2 is controlled by a 5 Hz gate signal and counts the number of pulses passing through the gate. The output from Q2109 is then fed to Q2107 , SN7490N which counts 10 Hz. Q2,0 generates a pulse each time it counts 10 pulses. This pulse is fed to Q„0, which displays a 100 Hz digit. The pulse is also used as a clock pulse for Q2102, Q2103 and Q208 to count 1 kHz, 10 kHz and 100 kHz pulses. Q2101 Q2103, TIL306 contains counter, latch decoder, driver and LED in one package. Q2108, SN74160 is used as a preset counter to add 500 kHz for such bands starting from 800 kHz. The BCD code output from Q2108 is fed to Q4, TIL308. TIL308 does not contain counter circuit. Q2112, 5N7404N is used as inverter. A part of gate pulse is fed to Q2111 SN7400N to generate reset and memory signals. e D2I0302105 E)m o 14 (;)2106 OM S D204 ow 1 U II DJ%) IT ' li CF;73-3---7;2 3 7 0.111 IMMOIMIMEN M MIIINIIMMEMIUM M=IMMMIINNUMMIONIMMINOMMM=1111. I r ! lir!! I I _ I __16 L_ -I D, t? ,A a___ _, iji___ C2219 =II 12222 C2223 Z ฎ 3.5MHz 70MHz 5 OMHz I 4.0MHz 02112 1 i li o I 1 gl II 1; ;II 21i II I , 1 i r: T ips C.27:11cri,.41).02Ati_.• • i 1- - -1 R2I01 19 8C2102 I 13 I 0003.:51—/-1 ;641 15 6 I 22% L 20ฐP 02111 1 il il 1 IN 6 6 :It '11717 41).61_ ง'Or NOTE: 02101-2103 T1L306 02201 MSL980Y-2 02104-2106 TIL308 02202 2S1(19 02107 SN7490 02203 SN76514 02108 SN74160 02204 MSM5564 02109 SN7400 02205 2SC373 02110 SN7404 02201-2210 IN60AM 02111 SN7400 D2211 1S1658 02112 SN7404 1 PB-I542 DISPLAY LOGIC UNIT MAINTENANCE & ALIGNMENT GENERAL This transceiver has been carefully aligned and tested at the factory prior to shipment. The reliability of the solid state devices used in the FT-301 should provide years of trouble-free service if the equipment is not abused and proper routine maintenance carried out. Do not attempt to align the transmitter without having the proper antenna or a dummy load con Figure 32 FT-301 Top View nected to the transceiver. We recommend off the air testing as a courtesy to other operators. The following alignment procedure requires certain test equipment such as an RF signal generator, an audio oscillator, a sweep generator, an oscilloscope and a VTVM. Without proper test equipment, do not attempt to adjust cores or potentiometers. Figure 33 FT-301 Bottom View Figure 34 FT-301D Top View Figure 35 FT-301D Bottom View AF UNIT (1) SSB CARRIER POINT ADJUSTMENT (TC501, TC502) (a) Settings: BAND 20 DIAL 14.25 MHz MODE CW Tune to transmit at the maximum power. (b) Connect the output of an audio oscillator to the microphone input. Set the frequency at 1 kHz and transmit on USB. Adjust the MIC GAIN control for 50 watts RF output to the dummy load. (c) Shift the audio frequency to 300 Hz without changing the audio output level or MIC GAIN control. (d) Switch between USB and LSB while adjusting TC„, for USB and TC502 for LSB to obtain 12.5 watts output on each sideband. (For the 80 meter band, USB and LSB will reverse but you are on 20 meters now.) (e) Return to receive mode. Switch the MODE selector back and forth between USB and LSB to verify that the tone quality of the noise on the two sideband modes sounds alike. Figure 36 AF Unit (PB-1437) (2) CARRIER BALANCE (a) Settings: BAND 20 DIAL 14.25 MHz MODE USB No input to the mike jack. (b) Connect a dummy load to the antenna receptacle and the RF probe of a VTVM to the antenna receptacle, J1. Adjust TC503 and VR501 alternately to minimize the VTVM reading. (c) If no VTVM is available, use a monitor receiver and adjust TC503 and VR501 for the minimum S meter reading. (d) Repeat this procedure until a minimum reading is obtained equally for both sidebands. FILTER UNIT, IF UNIT IF GAIN (VR301), S METER ZERO SET (VR401) S METER FULL SCALE SET (VR402) (a) Settings: BAND 20 DIAL 14.25 MHz TUNE 20 METER SELECT INT CHANNEL VFO RF GAIN MAX (FULLY CLOCKWISE) Connect the output to a stable signal generator to the antenna receptacle. Set the signal generator output to 0 dB and frequency to other than 14.25 MHz. (b) Set VR402 to a fully clockwise position. Adjust VR401 until the S meter indicates zero. (c) Set the generator frequency to 14.25 MHz at 0 dB output. Adjust the TUNE and DIAL for maximum sensitivity, then adjust VR301 until the S meter again indicates zero. RF SPEECH PROCESSOR The optional crystal filter XF201 is required to operate with the RF SPEECH processor. (1) Level adjustment when the processor is used (VR202 , VR203 ) (a) Adjust the MIC GAIN control to a proper setting. Refer to blanking unit adjustment on Page 31. (b) Apply a 2 mV, 1 kHz signal to the mike input jack. (c) Connect a VTVM to pin 11 of the FILTER unit while VR203 is turned fully clockwise. (d) Adjust VR202 so that the VTVM reads 40 mV. (2) Level adjustment when the processor is "off" (VR201 ) Turn the RF PROC switch "off" and adjust VR201 so that the VTVM reads 40 mV. VFO UNIT It requires skilled technique and knowledge to align the VFO unit. It is, therefore, recommended to refer all VFO work to qualified personnel should a case develop where a repair is needed on the VFO unit. Tco, . . . . A split type trimmer capacitor for temperature compensation. TC802 . . . . Band setting trimmer capacitor. L„,), TC,,„ TC„, Q,,03 Q801: Figure 41 VFO Unit PREMIX UNIT, CRYSTAL UNIT The 160 mA, 10 mA, 10 mD and WWV crystals are optional and their corresponding fine frequency setting trimmers have been factory adjusted with the standard crystals. PREMIX CRYSTAL OSCILLATOR TC90i — TC910) When optional crystals are installed, no alignment of 1' 70, is required. Should T701 need an adjustment for some reason, all other trimmers (TC901 — TC910) have to be realigned. (a) To align T701 , set the BAND switch to I OD and connect the RF probe of a VTVM to TP„, of the PREMIX unit (junction of C„, and C,„ ). (b) Peak T„, for a maximum VTVM reading, and then rotate the core counter clockwise until the VTVM reading indicates 50 mV. (Do not rotate the core more than one full turn.) (c) Set the BAND switch to 10C and adjust TC907 for a 50 mV reading. (d) Repeat the same procedure as step (c) on TC906 — TC901 for 10B through 160 meter bands respectively so that the VTVM readings indicate 50 mV. (There is no trimmer capacitor for the 80 meter band.) (e) Set the BAND switch to JJY/WWV. Preset TC.„, to its mid point (at half capacitance) and adjust Tco, for a 100 mV VTVM reading. Set the MODE to LSB and the TUNE to 2 of the unity scale, and then adjust TC,„ for a zero beat reception of WWV. X„0.(160) X„„,(40) X,„:‘(20) X „„,(15) X„,,(10A) X „„,;(1013) X„0,(10C) X5(10D) X „(JJY) Figure 42 Crystal Unit (PB-1441) Figure 43 PREMIX Unit (PB-1439) BPF UNIT (PB-1442) (1) BANDPASS FILTER (T1001 - T1005 ) The adjustment of the bandpass filters is critical to the spurious response. It requires a sweep generator and a scope for proper alignment. (a) Remove the jumper wire between T13701 and TP702 on the PREMIX unit. (TP702 is not shown on schematic, refer to Fig'/) (b) Connect the output of a sweep generator to TP702 and the RF probe of a scope to TP„, . (c) Set the VFO SELECT to EXT to disconnect the VFO from the circuit. Apply 30 dB sweep output to TP702 . (d) Monitor the wave patterns on the scope by offsetting the balancing pot VR„, on the PREMIX UNIT. (e) Adjust T1001 — T1005 so that the passband characteristics become as flat as possible within the passband range specified. BAND BPF PASSBAND 160 10.5 — 11.0 MHz 40 16.0 — 16.5 MHz 20 23.0 — 23.5 MHz 15 30.0 - 30.5 MHz 10 37.0 — 39.0 MHz (f) When completed, re-install the jumper wire between TP„, and TP„, . (2) PREMIX BALANCE (VR,701) (a) Set the BAND switch to 10 mD. Connect the RF probe of a VTVM to the pinjack, J701, and adjust VR„, for a minimum reading. (b) Return the VFO SELECT to INT and make sure that the VTVM reading indicates between 0.7 — 0.9V. Figure 44 BPF Unit (PB-1442) FIX UNIT (PB-1447) The trimmer capacitors TC„,, — TC„„ are provided for fine frequency tuning of fixed channel crystals. The 12th socket is for auxiliary and it is not connected to the switch. Figure 45 Fix Unit (PB-1447) RF UNIT (PB-1433) (1) TRANSMITTER MIXER BALANCE (VRioi ) (a) Transmit on the 80 meter band in CW mode with the TUNE set to 6 of the unity scale. (b) Adjust VRioi for a minimum power output. (2) RECEIVER MIXER (T102) Tune the transceiver to the internal marker signal and peak T102 for a maximum S meter indication. (3) 9 MHz TRAP (T101, T1401) (a) Set the BAND switch to the 40 meter band and tune the transceivr for maximum sensitivity with the TUNE control. Figure 46 RF Unit (PB-1433) Connect the output of a signal generator set to exactly 9 MHz, and apply enough output so that the S meter indicates S6 — S8. (c) Adjust T101 on the RF UNIT and T1401 on the TRIMMER UNIT for a minimum S meter reading. (d) Increase the output of the generator and repeat step (c) until the lowest S meter reading is achieved. BLANKING UNIT (1) SETTING OF MIC VR (VR1901) (a) Connect the output of an audio generator to the mike input jack and a VTVM to pin 5 of the IF unit. Tune the transceiver to transmit on the 20 meter band in USB. (b) Transmit with a signal input of 2 mV at 1 kHz and adjust the MIC GAIN control, VR1001 , for an 80 mV VTVM reading. (c) If using a microphone other than the one furnished with the unit, it will be necessary to readjust the MIC GAIN control. (2) CLARIFIER ZERO SETTING (VR1902) (a) Tune the transceiver to the marker or signal generator on any band. (b) Set the clarifier control to its centre (12 o'clock position). With the CLAR switch turned on, tune the dial for zero beat. (c) Turn the CLAR switch off and zero beat by adjusting VR1902 . Figure 47 Blanking Unit (PB-1451) LPF UNIT (PB-1445) (1) BALANCING OF OUTPUT DETECTOR TRANSFORMER (TC1301 ) (a) Set the ALC level control, VR1302 to fully clockwise position. Connect a dummy load to antenna terminal and time the transmitter to full output on CW mode at 80 meter band. (b) Peak TC1301 for a maximum power output. Figure 48 LPF Unit (PB-1445) (2) ALC LEVEL (VR1302) (a) Transmit on the 80 meter band as described above. Slowly advance VR1302 in a counterclockwise direction and set the VR1302 to the point where the power output starts to decrease. (b) A care must be taken when adjusting VR1302 as a high SWR due to the antenna mismatch will cause improper setting of VR1302 . (3) OVERDRIVE PROTECTOR (VR1301) (a) Transmit on the 20 meter band in CW with 100 watts output. (b) Change the MODE switch to USB and while speaking into the microphone normally, rotate VR1301 slowly until the protection circuit activates. This will be indicated by blinking of the S meter lamp. (c) Stop transmitting, then return the control Counter-clockwise 1/8 of a turn. This point is the proper setting for the overdrive protection circuit. Be sure not to return the control more than specified. (d) Turn the POWER switch off once to restore a normal condition. VR UNIT (PB-1448) (1) EXCITER, DRIVE LEVEL (VR1601 — VR1606) (a) Settings: BAND 160 M DIAL 500 (on white scale) TUNE 160 METER DRIVE Fully clockwise MODE CW VR1302 on the . Fully clockwise LPF unit (b) Adjust the TUNE control for a peak output while transmitting. Adjust VR1601 for 100 watts output. It is necessary to retune the TUNE control as you adjust VR1601 . (c) Switch the BAND from 80m through 10D and repeat the same procedure as step (b) for the corresponding potentiometers VR1602 — VR1606 for 100 watts output. AM UNIT (PB-1556) AM Unit (PB-1556) (1) AM CARRIER FREQUENCY (TC2001) (a) Connect a frequency counter to pin 2 of multi-connector. (b) Set the MODE switch to AM position and key the transmitter. (c) Adjust TC2001 until crystal frequency becomes 8999.3 kHz. (2) FSK SHIFT FREQUENCY (rC2002) (a) Connect a frequency counter to pin 2 of multi-connector. (b) Set the MODE switch to FSK position and key the transmitter. Adjust TC2002 until crystal frequency shift is 170 Hz (8999.13 kHz) when pin 3 and pin 6 of accessory socket are connected. (3) AM OUTPUT LEVEL (VR2001) Set the BAND switch to 10B, MODE switch to AM and DRIVE control to fully CW position. Key the transmitter and adjust VR2001 for 25 watts output. Figure 51 (4) AM MIC GAIN (VR2002) Observe the transmitted signal on oscilloscope and adjust VR2002 for 100% modulation. RF TRACKING Preselector Coils (T1 —TO and Trimmer Unit (TC1401—TC1418) (a) Turn the TUNE control fully counterclockwise and make sure that the knob indicates 0 on the unity scale. At 3.5 of the unit scale, the upper ends of the cores and the coil bobbins should line up with each other. (b) Set the BAND switch to 10 mD, the VFO to 30 MHz, and the TUNE control to the upper end of 10m segment (9.5 of the unity scale), then adjust TC1412 and TC1418 on the TRIMMER UNIT for maximum power output. (c) After completing step (b), return to receive mode and adjust TC,,, on the RF UNIT for maximum sensitivity. Do not change the VFO and TUNE settings once set up in step (b). (d) Set the BAND switch to 80m, the VFO to 3.5 MHz, and the TUNE control to the lower end of 80m segment (3 of the unity scale), then adjust TC1408 and TC1414 for the maximum power output. Return to receive mode and adjust TC1402 for maximum sensitivity. Figure 52 Trimmer Unit (PB-1446) (e) Shift the VFO to 4.0 MHz and the TUNE control to the upper end of 80m segment (4.1 of the unity scale), then adjust T, and T, for maximum power output. Return to receive and adjust T, for maximum sensitivity. (f) Repeat steps (d) and (e). (g) Repeat steps (b) and (c) and readjust TC1406 , TC1412, TCHis and TC,,, . (h) Set the BAND switch to 15m, the VFO to 21.0 MHz and the TUNE control to 7.5 of the unity scale. Then adjust TC1405 , TC1411 and TC1417 for maximum receive and transmit. (i) Set the BAND switch to 20m, the VFO to 14.0 MHz and the TUNE control to 6.5 of the unity scale. Then adjust TC1404, TC1410 and TC1416 for maximum receive and transmit. (j) Set the BAND switch to 40m, the VFO to 7.0 MHz and the TUNE control to 5 of the unity scale. Then adjust TC1403 , TC1409 and TC1415 for maximum receive and transmit. (k) Set the BAND switch to 160m, the VFO to 2.0 MHz and the TUNE control to 3 of the unity scale. Then adjust TC140„ TC1407 and TC1413 for maximum receive and transmit. When completed, replace all shields, covers, etc. removed for access to the various adjustments and test points. Q2 107 Figure 55 Counter•Mixer Unit (PB-1541) Figure 56 Display. Logic Unit (PB-1542) PARTS LIST *DIGITAL PB 1576( A MAIN CHASSIS PRINTED CIRCUIT BOARD M METER 1 K F1-002 — Z ) REJECT BOARD SP SPEAKER Q IC 1 SA-70 * P1'G14308 GP * pPC14305 Cl' RL RELAY RAB K41' 1)C12V-104T 7,8 DIODE Ge 1N60 FM RLS RELAY SOCKET 1-- 6 Si 1S1555 1 RAG X CRYSTAL S SW ITCH 1 IIC-18/U 8996 .9kHz # 210027 1 SP-2022 2A # 002975A RESISTOR 2B # 002981 CARBON COMPOSITION 3 ESR-E22CR15 ,1/2'W 3.3c2 4 ESR-E1241220 , lon 5 E SR- E365 R20 100n 12 13 14 * 7,8 6,9 , 2701-1 P PLUG ",- 470n 1,4 SQ4052 , IKI-2 2 CN1463 1.5K1 3 * \i-31-15--60-124S 2.7K1-2 5 CN-39651' 10,15 1 3.3K1 4 .7K J RECEPTACLE 11 27Ki 1 J SO-239 VR 2,3 LIG-625 13/U 4 CS-260 POTENTIOMETER 5-7 SG-8018 4 EVII-BOAR 051152 5002il 8 FM-144S 2 EVK- A2AR 101353 5K1213/5K1-213 9 QMS-Al12N1 1 5. 6 EVII-BOGR 20A14 10KnA(S) 10 QMS-A136F EVK- A2AR 10339 5KnA/51W13 11 CS-250 EVR-K8AS 11B53 5K1213 12 CN-7017 13 CN-1463 ( P-2 ) C CAPACITOR CERAMIC DISC 29 50W V 151)1( (CH) MJ MULTI JACK 40 , 0 . 001PF 1-8 3305-018-011 1-6,30 ,31,35-37 ' 0 . 047PF 44 , 47 , 48 , 50 , 51 PL PILOT LAMP 8, 9, 34 , 38 0 .1PF 1--3 I3Q15A-30423 A 12-28 , CERAMIC FEED TH RU 43 50W V 0 .001PF DS INDICATOR 1 CLAR RD-4 33 NI YEAR 2 FIX G1)-4 250W V 0 .047PF t COIL SUPPORT 41* 10 , 11 49 VC_ 1 ELECTROLYTIC Ti Assembly ( PB-1449 ) 16W V 100PF T2 Assembly ( , ) , 1000PF T3 Assembly ( 25W V 100PE PB RF UNIT PRINTED CIRCUIT BOARD VARIABLE CAPACITOR TSN-150 X 40 40 PF L 1433( A -- Z ) INDUCTOR 1,2 4,5 11F CHOKE 35/ill # 220017 Q IC, FET & TRANSISTOR , 250PH 101 IC MC1496G ,,,, 1mH 107 , SN7400N 102,103 FET 3SK4OM CH AF CHOKE 106 Tr 2SC735Y # 50-11 15 mH' 0.4A 105 , 25C741 104 , 2 SC784 R RF TRANSFORMER 1-3 # 220015 D DIODE 101— 108 Si 1S1555 109 Zener Z050 RESISTOR CARBON FILM 129 Y4 kV 122 106,118 115,130 126 102,103,122,133 110 107 101,128,131,134,136 108 116 127 121,124,137,139 138 104,105,109,135 125 123 119 112 111,117 NB UNIT PB PRINTED CIRCUIT BOARD 1434( AZ) 1012 Q IC & FET 82n 203 100n 204--206 150n 201,202,207 270C2 208 330n 470n D DIODE 820n 201,202 1Kn 203 IC TA7060P FET 3 SK4OM 2 SK19GR 3SK35Y Ge 1N60 I'M 1S1555 1.2K1-2 1.8Kn 2.2K1T2 X CRYSTAL 3.3K12 201 IIC-18/U 85451d1z 4210O23 4.7KC2 10K(2 XF CRYSTAL FILTER 15Kn 201 XE-92A 33K(2 R RESISTOR 68Kn CARBON FILM 100Kn 204,207- 209,217,2221/!I 100n 113 , 150Kn 223,235 120 220Kn 221,224 150n 114 , 680Kn 203 220C2 216,233 330n 211,230 1K1-2 VR POTENTIOMETER 205,212,231 2.21(1-2 101 V10K8-1-2 50K(213 202,206,227 10K(2 210 iskn C CAPACITOR 201,234 22Kit DIPPED MICA 215 33K12 135 50W V 100 PE 228 47Kn 234 68Kr2 CERAMIC DISC 213,218,220,225,226,229 100KC2 107 50W V 10 BF( CH) 219 150Kn 116 „ 15 BF , ) 214 220K12 114,115 , 20D1" , ) 232 1MS-2 117 , 221'F , ) 107 ,, 33 PE , ) CAI-ION COMPOSITION 106,125 „ 100 PE( ) Rx, ( FT-301S ) 11,.. 330n 122 500W V 0.001pF 101,103,110-113 50WV 0. 01PF 118-120,123,129 VR POTENTIOMETER 131-133,138,139 i_ 202 V10K8-1-2 2KI2B 102,104,105,108,109 50W V 0.047PE _ 201,203 , 5Knli 121,124,128,130,134,136 47 PE( CH) 100 DE( , 120 ) , ) 5601'Fi SI,/ 0.01PF INDUCTOR 216,218 - 222,227,228 106 # 220029 230,231,234-236 105,107 RE CHOKE 250PH 232 0 .047PE 101-104 500PH # 220028 TRANSFORMER MYLAR 101 R12-4172 # 220142 233 50 W V 0.047PF 102 R12-4170 # 220140 103 4: 1 Balun # 220016 TRANSFORMER PLUG 205,206 R12-4097 # 220101 101 CN-7017 201-204,207,208 R12-4170 # 220140 INDUCTOR 201 RE CHOKE PB PRINTED CIRCUIT BOARD 1435( A- Z FET & TRANSISTOR 302 EET 2SK19GR 303 2SC372Y 301 2SC7841{ DIODE 301,303- 306,310 Ge 1S1007 302,307 Si 1S1555 308 Zeller W Z110 407 IC T A7089 NI 22P1-I _ 401 VET 3SK4ONI 403,409 „ 2SK19GR 404,405 'Fr 25C373 406,410 „ 2SC735Y 402 , 2SC784R 408 2SC1383 DIODE 403 1S1007 4 401,405-408,410 Si 1S1555 402 Zeller BZ090 404,409 W Z090 X CRYSTAL 401 11C-18/U8999.3kIlz XF CRYSTAL FILTER 301 9M-20A 302 CW XI"-90C ( OPTION) 303 AM XI"-90B (OPTION) 304 SSB XE-92A RESISTOR CARBON FILM 303 14W 56n 304,312,315,316,323 " 100n 306,308 305,327 309,311 313,320,321,322,326 " 301,329 307,310 302 CARBON COMPOSITION 401,403,419,432 328 'D.V 56n 420 404 402 VR POTENTIOMETER 301 V10K8-1-2 500nI3 VR POTENTIOMETER 401,402 V10K8-1-2 1KnB C CAPACITOR 403 „ 5K2I3 CERAMIC DISC 302 50W V 33 P F. ( CH ) C CAPACITOR 307 „ 51 PE ( " ) CERAMIC DISC 301,303,305,308-311 '- 0.01/1F 408 50W V 10 PE( CH ) 313-317,321-323,325 414 „ 181'E( ' ) 304,312,318,319,324 0.047,u1' 428 , 391'F( ' ) 326 421 1201'I"( '' ) 1•ThECTROLYTIC 422 270 PE( ' ) 306 16W V 10PF 401,417,423 0.001PE 403,406,407,409-412 0.01PE 416,424,429,431,433 ' L INDUCTOR 404,405,413,415,419 , 0.047/11" 301 RE CHOKE 250PH 420,429,430 302-307 „ MYLAR TRANSFORMER 301,303,304 R12-4170 302 R12-4171 426,427 # 220140 418 # 220141 50 \V V 0.022/41-- „ 0.1P E PB PRINTED CIRCUIT BOARD 1436( - Z) ELEcTRoLy-FIC 402,432 16W V 425 TC TRIMMER CAPACITOR 401,402 ECV-1ZAV 20 X 40 20PE IC, FET & TRANSISTOR L INDUCTOR 505,506 50W V 391'V( CH ) 403 RE CHOKE 22PH 518 , 100 PE( ' ) 401,402 , 1 mH 507,508 , 1501'!") , ) 501,502,511-513,5l5 0.01pF T TRANSFORMER 503,504,514,543 0. 047p1" 401 R12-4171 # 220141 402 R12-4170 4220140 NI Y LA R 538,539 50-W V O. 0022PF AF UNIT PB PRINTED CIRCUIT BOARD 526 , O. 0047PF 528 0.022PE 525,541,545 0.047PF 1437( A—Z) 544 0.1/LE Q IC, FET & TRANSISTOR ELECTROLYTIC 503 IC LD3141 519,524,529,532,534 16-WV 1PE 501 FET 2SK19GR 523 , 2.2PF 507 Tr 2 SA695 I/ 531 , 4.7pE 509 ,, 2 S B529 D 527 , 22,uE 502 , 2SC372Y 520-522,533 , 33P F 506 , 2SC711F 534,542 16W V 100,u F 504,505 2SC1000GR 537,540 , 220P1" 508 2SD359D D DIODE TC TRIMMER CAPACITOR 503-506 Ge 1S1007 501,502 E CV-1Z W 20 X 40 201'l" 501,502,507 Si 1S1555 503 E CV-1 ZW 50 X 40 50P1" 508 ,, MV-5W 509,510 Zener W Z090 L INDUCTOR 504 RE CHOKE 221411 X CRYSTAL 506 , 250PH 501 HC-18/U 9001.5 kHz 501-503,505 , 1 mfi 502 , 8998.5 kHz T TRANSFORMER R RESISTOR 501 R12-4171 # 220141 CARBON FILM 533 ,1,41.v 10C2 RL RELAY 530 , 22n 501 G2E 12V DC 522 ,.... 56n 512 '''' 100n VOX UNIT 505,508,510,511 150n 534 180n PB PRINTED CIRCUIT BOARD 539,540 220n 1438( A — Z. ) 535 ,..- 270n 501-503,509,523,541 ',. 470n Q IC & TRANSISTOR 517,519,542 , 11(2 604 IC SN725601' 526,528 1.5K(1 612 '2 34013) MC-14013C1') 525 4. 2.21in 607 Tr 2 SA564A 524,538 "- 3.3Kn 605,608 '' 2SC372Y 506,507,514,516 ,..- 4.7K1T2 601-603,606,609 ' 25C373 518,532 10101 610,611 "- 2 SC735 Y 521 15K11 527 471(n D DIODE 520 56Kn 601-603,606 Ge 1 N60 ENI 504,529,531 , 100Kn 604,605 Zeiler W Z090 515 , 390Kn X CRYSTAL WIRE WOUND 601 I IC-13 /UW 100kHz 536,537 W 0.22n R RESISTOR CARBON EILNI VR POTENTIOMETER 633,637 ,1,4 W 100n 501 V10K8-1-2 500nB 603,613,621,638 , 470n 606,607,611,614,619,628,639,641 '''' 1Kr2 C CAPACITOR 605 , 2.2KC1 DIPPED MICA 629 ' 3.9Kn 530,536 50W V 330 PE 618,620,624-626,635 , 4.7Kn 612 5.6Kn CERAMIC DISC 604,610,615,616,631 10K(2 516 50W V lOPE( CH) 602,617,622,627,636 ''2 22Kn 509 ,..- 201'F( 4. ) 609 39K12 608,630,640 ,14 W 47Kn 714 ,141V 4702 601 68Kr2 703,720 z., 560f2 623,632 , 100Kf2 708 ,, 820f2 705 ---- 707 , 1 Kfl CARBON COMPOSITION 712 1.2Kf2 634 ,v2w 180f2 702 , 3.3K,C2 710,711,713,718 10Kf2 — VR POTENTIOMETER 701 , 15Kf2 603 V10K8-1-2 10KOB 715,719 , 1001(12 601 "z 50KnB 602 „ 1 Mf2B TANTALUM 613 50W V 2.2/IF 602,609 10/IF ELF CTR Of. YTIC 601,607,611,619 16 W V 1/IF 625 2.2/IF 624 4.7/IF 604,610,616,617,620 10/IF 603 22/IF 615 47/IF 630 100/IF FET & TRANSISTOR 802 FET 2 SK19GR TC TRIMMER CAPACITOR 801,803 Tr 2 SC372 Y 601 ECV-1ZW 50 X 40 50 PE DIODE INDUCTOR 801 Varactor 1S2236 601,602 RE CHOKE 4mH R RESISTOR SW SWITCH CARBON FILM 601 SS-12-04 809,811 Z,11V 100n 807 '''' 470n IIIIIMIIIIIIIIII=VZnMIMIIIllMlr 802 3. 3K(1 805,808 2.2K,f2 PB PRINTED CIRCUIT BOARD 801 10K,f2 1439( A—Z) 803 18KC2 804 , 22Ks-2 Q IC. FET & TRANSISTOR 806,810 100K0 701 IC MC1496G 705 EET 2SK19GR 702 Tr 2SC372Y C CAPACITOR 703,704 , 2SC784R DIPPED MICA 826 50W V 213E R RESISTOR 807 , 8 PE CARBON FILM 808,814,818 "z 331'E 709 YI‘V 5612 811 , 240 PE_ 704,711 z, 10012 813,821,823 "z 470 PE 716 z, 270f2 802,822 , 1000 PE 721 z, 330n — 41 — CERAMIC DISC T TRANSFORMER 809,810,812,815,819 50WV 0.01PE 820,824,825 1001 ( 160m) # 220018 1002 ( 40m ) # 220019 1003 ( 20m) # 220020 CERAMIC T. C 1004 ( 15m) # 220021 801 50 W V 41' F U.1 1005 ( 10m ) # 220022 805 " 91'E 11,1 1006 (urn) # 220043 803 " 20PE U.1 804,806 ,...) 201'F NPO 10W AMP UNIT PB PRINTED CIRCUIT BOARD VC VARIABLE CAPACITOR 801 13S2401)S114 1443( A—Z) TC TRIMMER CAPACITOR Q TRANSISTOR 801 TSN 170C 1101 2SC1589 802 TSN 150C 1102,1103 S10-12 L INDUCTOR D DIODE 801 Oscillator Coil # 220030 1102,1103 Si 101)10 804,805 RE CHOKE 1.811H 1101 Zener YZ33 803,806 ' 250PI1 802 " lmIl R RESISTOR CARBON CONI POSITION J RECEPTACLE 1105 -1-N.V 4.712 801 CN-3561 1107,1108 " 1512 802 CN-3965S 1103 2212 1109 3912 CRYSTAL UNIT 1110,1111 10012 1101 18012 PB PRINTED CIRCUIT BOARD 1102 " 33012 1441(A—Z) 1106 ' 82012 1104 2W 8212 CRYSTAL 901 ( 160m) HC-25/U 16.0MHz 902 ( 40m) " 21.5N1Hz C CAPACITOR 903 (20m) ,-, 28.51\111z DIPPED MICA 904 (15m) " 35.5MIlz 1110,1112 500W V 75 PV 905 (10mA) 42.5MHz 1111 " 150 PF 906 (10m13) " 43.0N1Hz 907 ( 10mC) ); 43.5MHz CERAMIC DISC 908 (10m!)) 44.0MHz 1109 500W V 0.001,(IF 909 ( W W V /,1 ..1 Y ) " 13998.5 kHz 1105 ' 0.007PF 910 (11m) , 41.5NIHz 1101,1108 , 0.01PF 1102;1104,1113,1114 ', 0.0471-11 XS CRYSTAL SOCKET 901 S-20 NIYI,AR 902 S-19 1115,1116 50W V 0.2PF CAPACITOR ELECTROLYTIC DIPPED MICA 1117 50W V 1/it' 904 50 W V 220 PF 1106,1107 16W V 33PE CERAMIC DISC L INDUCTOR 903 50W V 20 PF( CH ) 1101 RE CHOKE # 220031 902 ' 821'I'( " ) 1102 " # 220032 901 " 150 PE( ' ) 1103,1104 I ,owpass Coil It 220033 TC TRIMMER CAPACITOR T TRANSFORMER 901-904,908,909 ECV-1ZW 50 X 32 50PF 1101 #220023 905-907,910 ECV-17, W 20 X 32 201'F 1102 # 220024 BPF UNIT 100W AMP UNIT PB PRINTED CIRCUIT BOARD PB PRINTED CIRCUIT BOARD 1442( A— Z ) 1444( A —Z) R RESISTOR Q TRANSISTOR 1001,1007,1008 %‘\( 10K12 1201,1202 S-2535 1003-1006 " 12K12 1203 I3Y-1-1 1002 15Kn 1447( A— Z) BLANKING UNIT PB PRINTED CIRCUIT BOARD Q FET & TRANSISTOR 1451(A—Z) 1501 FET 2SK19GR 1502 Tr 2SC372Y Q ID & TRANSISTOR 1901 IC TP4011( MC14011 ) X CRYSTAL 1902 Tr. MPSA13 1501-1511 HC-25/U ( OPTION) D DIODE XS CRYSTAL SOCKET 1901 Si 151555 1501 S-14-12P RESISTOR RESISTOR CARBON FILM 1906 ‘ e 1K1-2 /.1 ?v 1904 , 3.91(12 1 1905 22K11 1907 331<11 1903 100K12 1901 1M1-2 1902 2M12 CARBON FILM 1504 /%4'W 10011 j 1502 " 1801 1001<11 - 1501,1503 CAPACITOR DIPPED MICA 1508,1510 50W V 4701'I" 1509,.., 8201'F VR POTENTIOMETER 1901 SR-19R( I)) 470nB CERAMIC DISC 1902 SR-19R 4701111 - C CAPACITOR M YI AR 1504 50W V 10PF( CH ) 1511-1521 ' 15 PF( ' ) 1505 " 100 PF( ' ) 1501 1501'I"( " ) 1901 50W V 0.1PF 1502 ' 2701'I'( ) 1503,1506,1507 0 . 011-11' RL RELAY TC TRIMMER CAPACITOR 1901 ( 2E 12V DC 1501-1511 ECV-1ZW 50 X 32 50 PI" AM UNIT PB PRINTED CIRCUIT BOARD L INDUCTOR 1503,1504 RE CHOKE 1.814i 1501 " 22PI I 1556( A— Z ) 1502 lmII Q IC, FET & TRANS1STOR VR UNIT PB PRINTED CIRCUIT BOARD 2003 IC TA71201' 2001,2005 F ET 2SK19CI-Z 2002 ' 35K4ONI 1448(A—Z) 2004,2006 2SC372Y D DIODE D DIODE 1601 Zener kV Z090 2006,2007 Ge 1N6OFM 2001-2003,2005 Si 151555 2008-2010 R RESISTOR CARBON FILM 2004 Zeiler W Z090 1601.!-(4W 47011 1602 " 471ti12-' X CRYSTAL 2001 HC- 18/U 8999.3 kHz # 210015 VR POTENTIOMETER 1601-1606 SR19R 47K1IB R RESISTOR CARBON FILM SW UNIT PB PRINTED CIRCUIT BOARD 2008,2014 ,:t" W 10012 2003,2025 , 15012 2016 470n 1450(A—Z) 2002,2019,2022 11<12 2007 " 1.2K12 C CAPACITOR 2026,2027 2.2Kn TANTALUM 2009,2017,2021,2024 " 3.31<12 1801 35 W V O. 47/1F 2004,2006,2011 4.7K12 1802 " 1.5,uF 2023 5.61<12 2010 10Kn S SWITCH 2018 " 151<12 1801,1805 SLE-14301 2009,2020 , 221<12 1802,1804 SLE-12201 2013 " 331<12 2015 47Kn 2002 2006 2013 IC NI SL980Y-2 „ M SN15564 2003,2007, 2008,2010,20120. 01/al' 2 , „ SN76514 L 2020,2021 EET 2SK19GR 2001,2022,2023,2029 , 0. 047PE t 2205 1- Tr 2 SC373 NIYI„AR 2027 50NV O. 0047PE 2011 0 . 1PE DIODE 2201-2210 Ge 1N60ANI 2211 Varactor 1S2209 X CRYSTAL 4_ 2201 HC- 18 /U 18 .5N1Hz # 210024 2015 „ 10PE I 2202 11C-14 /W 655 . 36kHz # 210025 2017 „ 22PE 2016 ,2018 , 100PE R RESISTOR CARBON COM POSITION TC TRIMMER CAPACITOR 2205 i NY iKil 2001 , 2002 ECV-17W 20 X 40 20 PE CARBON FILM INDUCTOR 2202 , 2203 14 NV 1003 2002 RE CHOKE 22P H 2201 „ 18013 2001 „ 250/41 # 220100 2207 „ 220n 2003 „ lmFI 2206 „ 22K0 2004 4m1I VR POTENTIOMETER 2201 EVL- S3AA 00114 10K1Ili DISPLAY LOGIC UNIT* PB PRINTED CIRCUIT BOARD C CAPACITOR 1542 ( A— V.) DIPPED MICA 2216 , 2217 50W V 511'I" IC 1- 2101 — 2103 TIL306 L CERAMIC DI SC 2104-2106 TIL308 2202 50W V 1 PE( CH ) 2109 >2111 SN7400N 2203 „ 151'I") , ) 2110 , 2112 SN7404N T 2208 „ 221)14'l , ) 2107 SN7490AN _j- 2204 „ 56 PE( , 2108 SN74160N I 2205 „ 68 PE( , ) p2206 „ 100 PE( SE) DIODE _1 2201,2207,2213 —2215 O. 01PE 2101-2104 Ge 1N60ANI 2209;2212,2241 „ 0.047/41" i R RESISTOR C E RAM IC FEED TRIIU CARI3ON CON1POS IT ION 2101 %ON' 220n 2218— 2240 ECK- YIH 102W E 0 .001PE 2103 , 2106 1Kr2 TC TRIMMER CAPACITOR 2102,2104,2105 10K12 2201 ECV-17AV 20 X 53 20P1" C CAPACITOR 4 L INDUCTOR DIPPED MICA 2201 RE CHOKE 250PH # 220100 2102 50W V 2001'I" 2202 „ 5 .6PH # 220145 2104 , 2105 „ 330 P E L 2203 „ 35,u11 # 220031 2204 „ 10PH CERAMIC DISC 2101 , 2106 50 NV V 0 .047PE F T TRANSFORMER 1 2201 T1005A # 220144 MYLAR 1- 2103 50W V O. 0033144' J PIN PLUG, JACK i 2201 M-31-15-60-124S 2202 M-31-15-60-114P CARBON COM POSITION 101if1 2301,2302 N'W LED UNIT PB PRINTED CIRCUIT BOARD PL LAMP 40mA 2301- 2303 110041-32404A 12V 1471(A-- Z) D DIODE LAMP BOARD B PB PRINTED CIRCUIT BOARD 2401 LED TLR-108 1646( A- Z) RESISTOR CARBON FILM Q TRANSISTOR 2401 i/i \ \ 4701-1 2501 2SC5361) LAMP BOARD A* PB PRINTED CIRCUIT BOARD RESISTOR CARBON COMPOSITION 10kn 2501 NNY 1565( A-Z) PL LAMP Q TRANSISTOR 2501,2502 130041-32404A 12V 40mA 2301,2302 2SC5361) RESISTOR r - 75XF CARRIER Q5QI 0,02-2SC372Y ,, • ---, •,, T.50 / 1 7, I R,V9 " '--W , 1 AN ' ' A20, $5 , /50 / JOS C 2r 1G R - , , • , , ...; : 4 / 7/ A 'For, i- 17-"*soe Lt-.*-`4-.— Rso-41-2 c502 014- ,54,15- ii. , EIUF t. c509,,,P Ii4.,,*14-.7L1 ,L-T I i b 4 -' /07 I ili IZ, ,4lAl k' L50 Z2 k 1 z 4)s.1 5Dull r' 24. C330 0508 9D -MI 050I4P SC71IF 6' 1,47, vs 22 —1 ' 35 qr Al •.:1-- 4 . , -:, .-g,i- 1 4,-3., II T? r • T 91 c R5/6, 2. 4 ‘1V. * R.536 .442 R5.17 War 033/ L 1.1)3141 .4M271,191,3X e . V....,,,,e.ri51 ex "13' _ Lq , Z ' 0503 Q504,Q505 2SCIO0O?: 1 CIL' • _ J ;*--.‘ ..4 '''''' .7477. , 0509 AMP 0507 2 _42 (P8-14378 AF UNIT) 259529D 2SA69 5D two., 1S/555 A • Lil 02009 /5/555 1 1: 2 "?' 1 t 02004 h I 28C372Y c "tY'kif/91i . 02005 * 2 C.1071 AO N ilA 1 W A • - ,1 i ??. '?.' t •S ,1 R # i , ,,, • i 0:".; , •,• oe / 02 116 02003 I L 2SC372Y ,, 0- TA7120P J 1 L_ Roll 414 VOX AMP c DC AMP 6ฐ ,0603 T 8 R0,0,7 ; SC3 72y _1 39p _ 2SC373x2 REG ro,.576- .a0/ 100 K 632 'P 74' 50P Q a -1 zup 7 1 — i0610C)611 2SC735Yx2 .4; looKhtz osc L 86/8/ o_ _ (PB-14388 VOX UNIT)