1 TRANSISTORIZED, POWER SUPPLY HIGH-LEVEL PUSH-PULL MODULATION DUAL CONVERSION RECEIVER "PASS BAND" FINE TUNE CONTROL 24 CHANNEL TURRETUNER I GENERAL SUPER MC-ll PDF d By
2 1. CHANNEL SELECTOR. The MC-11 has the all-new TurreTuner, which gives a choice of 23 C13 channels plus Civil Air Patrol (CAP) frequencies. The selector may be rotated in either direction. Being cast of high quality nylon, this new Turret design enjoys practically unlimited life expectancy. Silver plated spring contacts are provided. Only an occasional speck of "Lubriplate" is required on the spring contacts. 2. VOLUME CONTROL, ON - OFF. The volume control is coupled to the ON-OFF switch at the left side of the front panel. Audio output is continuously adjustable from silent to over 3 watts of audio output. This control is also used to adjust power level in BullHorn operation. 3. NOISE TER TONE SWITCH. Provides treble attenuation and noise filter. 4. LOCAL - DIST. SWITCH Two sensitivity ranges are provided for best signal to noise' ratio under different conditions. The set will be operated in the "LOCAL" position most of the time. When operating in extremely quiet areas and where greater distance is to be covered, set the range switch to "DIST" This will provide maximum sensitivity. It should be noted that the efficiency of the squelch control depends upon this switch being in the correct position. 5. BULL-HORN SWITCH. A "'RADIO/BULL-HORN" switch is provided to allow for use as a Loud Hailer or Public Address system. A plug at the rear of the set is used to attach an External Speaker 6. AUTOMATIC NOISE LIMITER SWITCH. (ANL) A switch is provided on the front panel that disables the ANL when desired. This serves two purposes. It allows for an aural comparison of noise level versus noise limiting and in some locations, which are far removed from man-made noise, allows for slightly more receive sensitivity. Comparing reception with switch "IN" and "OUT" indicates whether or not the ANL is functioning. 7. SQUELCH CONTROL A front panel adjustable squelch control is provided to mute the audio _signal when no signal is received. It may be adjusted open at any desired signal level from.1uv to 2000 uv. 8. "PASS BAND" RECEIVER TUNING A front panel control is provided to tune the receiver ± 2 KC from center frequency. This allows an off frequency signal to be tuned in. Page 2
3 CIRCUIT DESCRIPTION CIRCUIT DESCRIPTION OF THE RECEIVER: The RF amplifier VI is a high gain twin triode used in a cascade circuit with separate antenna input coil and clamp AVC circuit to get maximum gain with minimum noise. The gain of VI is automatically controlled by the AVC line and manually controlled by the Range switch. The signal from VI is fed to the lot mixer V2 where it is mixed with the channel oscillator signal from V7-A. The mixing of these two frequencies produces sum and difference frequencies MC and MC. The lot IF transformer L6 selects the difference frequency MC and feeds it to the 2nd mixer V3A. The selected signal is mixed inv3a with the 2nd conversion frequency MC from oscillator V3B. This MC oscillator is adjustable ± 5 KC from center by a control on the front panel. This allows you to fine-tune the receiver to receive an off frequency signal. The mixing of these frequencies produces sum and difference frequencies MC and 456 KC. IF transformer L8, L9 and LIO select the difference frequency 456 KC. The five tuned circuits of these transformers also provide a high degree of selectivity while maintaining a flat response across the channel limits. This 456 KC signal is amplified in V4, a variable gain amplifier. The gain of V4 is automatically controlled by the AVC voltage and is manually controlled by the Range switch. The Range switch is provided to allow you to select the best sensitivity for different signal and noise conditions. The AVC voltage is used to automatically control the gain of VI and V4 to prevent overloading of the receiver. IF transformer L11 at the output of V4 couples the signal to the IN914 detector diode X2. The audio detected from the signal is led through an R-C network to the IN914 noise limiter diode X3. The noise limiter has a switch on the front panel to allow you to compare the noise with and without the limiter operating. The IN914 detector diode also generates the negative AVC voltage. A squelch is provided so that you may mute the receiver. The squelch diode X4 operates in the following manner. When the voltage at the cathode end of the diode is more positive than the voltage at the anode end, the diode will not allow the detected signal to pass. The squelch control is provided so that the cathode voltage may be adjusted to turn off or turn on the diode. While X4 receives its cathode voltage from the manually adjusted squelch control, it receives its anode voltage from a point that is automatically adjusted by received signals. The received signal produces a negative voltage, at diode X2, which is fed through the AVC line to the control grid of V4. This negative voltage lowers the plate and screen grid current of V4 which allows the voltage of the screen grid to rise. The anode end of diode X4 is connected to the screen grid of V4 through resistor R26, as the voltage rises on the screen grid it also rises on the anode end of X4. If the squelch control has been set to turn off the background noise and a signal is received, the anode end of X4 becomes more positive than the cathode end which turns on X4 and allows the audio to pass through to the volume control. The adjustable volume control sets the amount of audio that is heard from the speaker. From the volume control the audio is amplified in V5-B/V6.A.P.C. and fed trough output transformer T1 to the speaker. A jack is provided at the rear of the chassis to allow an external speaker to be connected. When the external spkr. is plugged in, the internal speaker is automatically turned off. An external speaker may also be connected to the 9-pin accessory socket using pins 4 & 6 or 8 & 9. When using this connection, both the internal and external speakers will be operating. See page 8 for more information on external speaker wiring. The receiver audio is also used in the "BULL-HORN" mode of operation. With the "B.H. Radio" switch in the R.R. Position V3-B the 2nd. conversion oscillator is turned off. And the 100 V. neg. line is removed from the microphone connector. This shuts the receiver off and prevents the transmitter from operating when the microphone button is pressed. OPERATION OF THE "BULL HORN" is as follows: With the microphone button pressed, the audio from the microphone will be amplified in V5-A the microphone Pre - Amp and coupled to the receiver volume control, which allows you to adjust the volume of the "Bull Horn". The receiver 1 st audio amplifier amplifies the audio and couples it to the receiver audio power output amplifier V6.A.B.C. The output transformer T1 is connected to pins 4 & 8 of the accessory socket and to the external speaker socket. CIRCUIT DESCRIPTION OF THE TRANSMITTER: The input frequency determining crystal for the receiver is also used as the transmitter output frequency control. This crystal is mounted in the turret at the left front of the chassis. This turret allows 24 crystals to be utilized without the problem of correlation difference due to lead length differences. The fixed contact points, with the crystals rotating to engage them, assures that each crystal will have the same capacity in the oscillator circuit. With this system no correlation differences will be possible. Also with this system, unlike the synthesized types, should one crystal become defective only one channel becomes inoperative. For channel 11, the transmitter mixer oscillator, V7-A, produces the channel frequency by mixing the MC signal from the turret crystal with the MC signal from oscillator V8. The mixing of these two frequencies produces sum and difference frequencies MC and MC. Coil L13 at the output of V7-A selects the sum frequency and couples it to Buffer-amplifier V7-B. The selected frequency is amplified in V7-B and its output coil L-14 is also tuned to the sum frequency to further select the MHz signal and reject the difference frequency. Power amplifier V9 is the output amplifier of the transmitter, operating in Class C, and is couple to the antenna through the Pi-Net coil L-17. Harmonic radiation is held to a minimum by the use of tuned circuit L4 and C85, the TVI Trap. The power amplifier is high level modulated by the push-pull modulator V6. The modulator operates in class AB-1 and is couple to the power amplifier by transformer T1. V6 is a three section tube with the two pentodes as the high power modulators and the triode as the phase inverter to drive the pentodes. The output of the microphone is amplified in V5-A and B, and coupled to the phase inverter. WARNING: FOR EXPORT USE ONLY Because of the high power capability of the MC-11 a resistor is used in series with the secondary of the modulation transformer to limit the final amplifier power input to 5 watts. This resistor, R45 is rated at 15watts and is mounted on the shield plate between the power supply and receiver IF strip. FREQUENCY ADJUSTMENT: Adjustments of channel crystals should be made only during transmit mode of operation. This will result in the correct crystal frequency for the receiver. Readings should be taken across all channels and an average deviation noted. Trimmer C67 is provided to adjust the turret crystals to frequency. The measurement of the transmitter frequency must be made with an instrument of.001% accuracy or better.
4 TRANSMITTER ALIGNMENT: Due to the nature of the frequency mixing circuits used in the MC"11, it is imperative that the following procedure be followed in the exact sequence shown. All tuning can be done using a R.F. wattmeter such as General's model 615-C or equal. All frequencies should be checked -using General's model CG-3 frequency counter or any accurate heterodyne frequency meter. 1. Turn the osc. coil L13, the buffer coil L14 and the pi-net coil L17, full counter clockwise, (out). 2. Turn to channel 1 and tune the buffer coil L14 until the wattmeter reading is between.25 and.5 watts. Caution: Do Not tune for maximum watts. 3. Next tune the osc. coil L13 for Maximum Power Output ( approx. 3 to 4 watts ). 4. Next tune the buffer coil L14 for maximum power output. 5. Turn to channel 23 and turn the pi-net coil L17 until the power output falls below I watt. Carefully turn the pi-net coil back out to the first peak. ( Not to maximum watts ). 6. Turn back to channel I and repeak the osc. coil L Repeak the buffer coil L14 for maximum watts. 8. Turn back to channel 23 and repeak the pi-net coil L17 for maximum watts with modulation. 9. Tune the TVI trap L4 by turning the MC-11 to channel 23 and observe a nearby TV set tuned to channel 2. Tune for minimum interference on the TV set. 10. Adjust the position of capacitor C92 (on the pi-net coil) to adjust the transmit reading of the meter on the front panel of the MC Check all channels for correct frequency. 12. When connected to an antenna, retune the pi-net coil L17 for maximum watts on channel 23 if necessary. RECEIVER ALIGNMENT: Receiver alignment requires a frequency source having outputs at 456 KC, MC and a channel frequency near the center of the CB channels, etc. The channel frequency signal should have an accuracy of.001% or better. Connect a VTVM to pin 2 of L11 the last IF. Sequence of tuning is as follows. 1. Connect the 456 KC signal to pin 2 of V3-A. Adjust level of signal for a reading of about - I volt on the VTVM. 2. Tune the top and bottom of L8, L9, LIO and LI1 for maximum reading on the VTVM. Lower the 456 KC signal, while tuning, to remain around -I volt. Settings from original should never vary more than a half turn. 3. Remove the 456 KC signal. 4. Connect the MC signal to pin 4 of V2. 5. Set the receiver fine tune control to mid position. 6. Tune the 2nd. Conversion oscillator coil L7 for maximum reading on the VTVM. 7. Tune the top and bottom of L6 for maximum reading on the VTVM. 8. Remove the MC signal. 9. Connect the channel frequency signal to the antenna connector. 10. Tune coils L1 and L5 for maximum reading on the VTVM. Lower the signal level, while tuning, to remain around - I volt on the VTVM. 11. Remove the channel frequency signal. 12. Remove the VTVM. 13. With a dummy 50 ohm load connected to the antenna connector adjust R66, the S meter control, for a zero reading on the S meter. 14. Replace set in cabinet. Set fine tuning control to mid position, and through the hole in the bottom of the cabinet adjust C22 to receive the correct channel shown on the channel selector. NOTE: Alignment steps 1-13 will he necessary only if the coils or associated parts have been repiaced or tampered with.
5 PARTS LIST C1 150 PF, 10%, NPO, 500 V C MF, GMV, I KV RI 56 K, 10%, ½ W S1 DPDT, Local-Dist. Range, Sw. C2.003 MF, 20%, 1 KV C79 12 PF, 10%, NPO, 500 V R2 470 K, 10%, 1/2 W C3 33 PF, 10% NPO, 300 V C PF, Type QC R3 150 Ohms, 10%, 1/2 W S2 DPDT, ANL S.w. C4.001 MF, GMV, I KV C81 33 PF, 10%, NPO, 300 V R4 560 K, 10%, 1/2 W S3 DPDT, Radio - B.H. Sw. C5.03 MF, %, 300 V C PF, 20%, 2 KV R5 330 K, 10%, 1/2 W S4 DPDT, Noise Filter Tons $w. C6.003 MF, 20%, 1 KV C PF. 20%, 2 KV R6 33 or 47 MEG, 10%, 1/2 W S5 On - Off Sw. (part of R28) C7.003 MF, 20%, 1 KV C or.002 MF, GMV 2 KV R7 100 K, 10%, 1/2 W S6 P.T.T. Sw. ( On Mic.) C8.005 MF, GMV, I KV C85 15 PF, 10%, NPO, 500V R8 150 Ohms, 10%, 1/2 W C9 470 PF, 20%. 1 KV C86.05 MF, %, 100 V R9 330 K, 10%, 1/2 W CIO 82 PF, 5%, NPO, 300 V C MF, 20% 1 KV R MEG, 10%, - 1/2 W TI Mod.-Output Transf. (M-25) ClI.22 MF, 10%, 300 V, Mylar C MF, 20%. 1 KV RII 330 Ohms, 10%, 1/2 W T2 Power Transf. ( /6451) C PF, 20%, 300 V, Ceramic C89A R K, 10%, 1/2 W T3 Transistor Driver (TD-2) C MF, 20% 1 KV C89B MF, GMV, I KV R Ohms, 10%, 1/2 W C14 47 PF, N750 C90 30 x 30 MF, 450 V R14 47 K, 10%, 1/2 W V1 6BQ7A, RF Amp. C15 ( inside L6 ) C91 25 MF, 450 V, Electrolytic R K, 10%, 2 W V2 6CW4, 1st. Mixer C MF, 20%, 1 KV R 16 1 K, 10%, 1/2 W V3 6U8A/6GH8A, 2nd. Mixer, C PF, 10%, NPO, 300 V R K, 10%, 1/2 W I st. IF Amp, 2nd. Conv. Osc. C18.02 MF, 20%, 30 V RIB 100 K, 10% 1/2 W V4 6BA6, 2nd. IF Amp. C19 68 PF, N-150, 300 V R Ohm s, 10%, 1/2 W V5 12AX7A, Mic. Pro-Amp. Audio Amp. C MF, 20%, 1 KV R K, 10%, 1/2 W C21.01 MF, GMV, 500 V CM-3 Ceramic Microphone R21 47 K, 10%, 1 W V6 ECLL800, Phase Inv. Mod. C PF, variable R K 10%, 1/2 W & Rec. Audio Output C PF, 10%, NPO, 1 KV R K, 10% 1/2 W V7 6AL11 Rec. Xmtr. Osc., C PF, Air Trimmer R K, 10%, 1/2 W and Buffer C PF, 10%, 300 V F1 1.5 Amp Fuse R K, 10%, 1/2 W V8 6CW4, MC. Osc. C26 68 PF, N-150, 300 V F2 10 Amp Fuse R Meg, 10% Y2 W V9 6GE5, Power Amp. C27.01 MF, GMV, 500 V JI Antenna Connector, SO-239 R Meg, 10%, 1/2 W XI IN914, Silicon, AVC C PF, S. Mica J2 External Speaker Jack R28 I Meg, Control Clamp Diode C29 ( inside L8 ) J3 115 VAC Power Cord Socket R29 82 K, 10%, 1/2 W X2 IN914, Silicon, Detector C MF, 20%, 1 KV ( 11 - Pin Female ) R K, Control Diode C PF, Type QC J4A 12 VDC Power Cord Socket R31 68 K, 10%, 1/2 W X3 1N914, Silicon, Noise C PF, S. Mica, ( inside L9) J413 ( 11 - Pin Female R32 47 K, 10%, 1/2 W C PF, Type QC J5 9 - Pin Accessory Socket R33 I Meg. 10%, 1/2 W Limiter Diode C PF, S. Mica R34 56 K, 10%, 31 W X4 IN914, Silicon, Squelch C35 ( inside LIO ) J6 Microphone Jack ( Socket R K, 10%, 1/2 W Diode C MF, GMV, I KV 8-700/60HA4F R K, Pot. X5 IN99, Germanium, Motor C37 68 PF, Type QC KI Relay, 5 K Coil, DPDT R K, 10%, 1/2 W Diode C38.02 MF, 20%, 30 V R K, 10%, 1/2 W X6 750 ma. 600 V, C MF, GMV I KV R K, 10%, 1/2 W Silicon Rectifier C40.22 MF, 10%, 300 V, Mylar LI Antenna Coi I R K, 10%, 1/2 W X7 750 ma. 600 V, C MF, GMV, I KV L2 10 UH, RFC R K, 10%, 1/2 W Silicon Rectifier C PF, S. Mica L3 33 UH, RFC R K, 10%, 1/2 W X8 750 ma. 600 V, C43 ( inside LI1 ) L4 TVI Trap R Ohms, 10%, I W Silicon Rectifier C PF 10% 300 V Ceramic L5 I st. Mixer Coil, 27 MC R K, 10%, 1 W X9 750 ma. 600 V Silicon Rectifier C45.05 MF, %, 100 V L6 1 st. IF Tran sf., MC. R K, 10%, 15 W XIO ZD6, Mod. Limiter, C MF, 20%, 1 KV L7 Rec. Osc. Coil, MC. Candohm Res. Zener Diode C47.22 MF, 10%, 300 V, Mylar L8 2nd. IF Transf., 4.56 KC R46 10 Ohms, 10%, 2 W, WW XII ZD6, Mod. Limiter, GMV, I KV C MF, L9 2nd. IF Coil, 456 KC R47 47 K, 10%, 1/2 W Zener Diode I KV C MF, GMV, LIO 2nd. IF Transf., 456 KC C50.22 MF, 10%. 300 V, Mylar L11 2nd. IF Transf., 456 KC R48 47 K, 10%, 1 W Y MC. Crystal C PF, 20%, 300 V L UH, RFC R49 18 K, 10% 1/2 W C MF, GMV, 1 KV L13 Rec. Xmtr. Osc. Coil R50 33 K, 10%, 1/2 W Crystal Turret - Type B Crystals C MF, GMV, I KV L14 Buffer Coil R K, 10%, 1 W C PF, 20%, 300 V L15 60 UH, RFC R K, 10%, 1 W C PF, 20%, 300 V I KV L16 33 UH, RFC R53 R54 47 K, 10%, 1/2 W 47 K, 10%, 1/2 W C MF, GMV, L17 Pi - Network R K, 10%, 1/2 W C57 10 MF, 30 V, Electrolytic L18 Filter Choke 39 K ), 10%, 2 W 33 K ( C58.01 MF, GMV, 500 V Lig Filter Choke R56 or C59 10 MF, 30 V, Electrolytic L Hy., 200 Mo., Choke R K, 10% )1 W C PF,±.25 PF, NPO No R58 R59 22 K, 10%, 1/2 W 68 K, 10%, 1 W C PF,-+.25 PF, NPO C62.22 MF, 10%, 300 V, Mylor ML1 Meter Lamp R Ohm', 10%, 1 W C63.02 MF, 50 V ML2 Meter Lamp R61* 1.8 Ohms, 10%, 1 W R62 10 Ohms, 10%, 1/2 W C65 20 MF, 150 V, Electrolytic R63 56 Ohms, 10%, 1/2 W C PF, Type QC R64 No Lamp C PF, Var. PI Microphone Plug R65 10 Ohms, 10%, 2 W, WW C MF, GMV,,500 V (8-7001/09CL4M) R66 3 K, Control C69 33 PF, 10%. NPO, 300 V P2 I I - Pin Male Power Plug R K, 10%, 1/2 W Candohm\ C70 68 PF, S. Mica, 300 V R68A 1150 Ohms, 15 W, C71.01 MF, GMV, 1 KV P3 B.H. ( P.A. ) 9 - Pin Plug R68B 100 Ohms, 2 W, WW, Res.) Specifications and prices subject to change without notice.
6 C72 33 PF, 10%, NPO, 500 V PL-1 No.12 Pilot Light C73 22 PF, 10%, NPO, 500 V C74 47 PF, 10%, NPO, 300 V C75 15 or 22 PF, 10%, NPO, 300 V C MF, GMV, I KV QI 2N511, Pwr. Transistor C MF, 201%, 1 KV Q2 2N511, Pwr. Transistor A. REMOTE OR EXTERNAL SPEAKER WIRING FOR RADIO AND BULL HtRN: An external BH-6 speaker or auto radio speaker of any size having a 4-8 ohm voice coil may be attached by using Pins No. 4 or 8 and Ground Pins No. 6 or 9 of the accessory socket found at the rear of the Chassis. The external speaker will work at the same time as the internal speaker. CAUTION: Solder wires carefully as there is high voltage present on adjacent connector pins. Be sure to put plastic Insulating cup back an plug. B. EXTERNAL SPEAKER WIRING RADIO, B.H., P.A. An external BH-6 speaker or auto radio speaker may be attached by using the break-in jack at the rear of the chassis The internal speaker will be turned off when external speaker is plugged in. Be sure to place the Bull Horn speaker outside vehicle. CAUTION: Do not operate Bull Horn switch unless Additional speaker load is connected. Bull Horn C. TYPICAL AUTO INSTALLATION OF BULL HORN: When mounting speaker behind grille, tilt horn about 30*downward to prevent buildup of mud or ice in speaker. Use a 4-8 ohm weather-proof speaker, such as the BH-6. Standard 8-16 ohm units will produce distortion and less audio power. VOLTAGE TEST DATA All voltages read-with controls in CCW position. N.F. TONE "IN", Range swith on "DIST.", ANL switch on "OUT", Bull Horn on "RADIO". Use VTVM. Operate at 117 VAC. 10% variation permissable. All voltages positive unless indicated otherwise. Antenna tied into dummy load. PIN I PIN 2 PIN 3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8 PIN 9 PIN 10 PIN 11 PIN 12 TUBES T R T R T R T R T R T R T R T R T R T B T R T R V1 6BQ V2 6CW Y 6U8/6GH8A V3 Y V4 6BA G. G. V5 12AX7A V6 ECLL G. G V7 6AL11 V8 6CW V9 6GE5 G. G., Page 8
7 1. L9, 2 nd IF coil, 456KC 17. K1 - Relay 2. Power Plug 18. L13 Xmit/Rx Osc. Coil 3. Power Transformer 19. V5 12AX7A, Mic Pre-amp 4. L8, 2 nd IF Transformer 456KC 20. Modulation Transformer 5. V MC Osc. 2 nd Mixer, 6U8A/ 6GH8A 21. V9, 6GE5, Power Amp 6. L6, 3.456MC Mixer 22. V6, ECL1800 Phase Inverter Mod. 7. V2 6CW4, 1 st Mixer 23. L11, 2 nd IF Transformer, 456KC 8. L17 Pi-Network 24. V4, 6BA6, 2 nd IF AMP 9. V1 6BQ7 RF Amplifier 25. L10, 2 nd IF Transformer, 456KC 10. V8 6CW4, Osc. 26. C90, 30 x 30 MF, 450V 11. Y2 Crystal Transmit Synthesizer 27. J1, S0-239 connection Channel Turret 28. Transistorized Power Supply 13. Channel Selector 29. L20, Filter Choke 14. V7 6AL11, Transmit and Rec. Osc 15. S-meter 16. L4 TVI TRAP
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Building a Bitx20 Version 3 The board can be broken into sections and then built and tested one section at a time. This will make troubleshooting easier as any problems will be confined to one small section.
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Instruction Manual OM3500 HF SHORTWAVE POWER AMPLIFIER OM POWER, s. r. o. 930 30 Bác 126 SLOVAKIA Important safety instructions: The amplifier contains high voltage circuits. Never turn the amplifier on
C Mobile Communications MASTR II POWER AMPLIFIER MODELS 4EF4A1,2,3 Printed in U.S.A. Maintenance Manual TABLE OF CONTENTS DESCRIPTION.................................................... 1 CIRCUIT ANALYSIS.................................................
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A 75-Watt Transmitter for 3 Bands Simplified Shielding and Filtering for TVI BY DONALD H. MIX, W1TS ARRL Handbook 1953 and QST, October 1951 The transmitter shown in the photographs is a 3-stage 75-watt
FT-897 Local Oscillator Adjustment Reference Frequency Adjustment a. Connect a frequency counter to TP1032. b. Adjust the trimmer capacitor (TC5001) for 67.875000MHz ±5Hz on the frequency counter. c. Connect
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Amateur Radio Technician Class Element Course Presentation ti ELEMENT SUB-ELEMENTS Technician Licensing Class Supplement T Electrical/Electronic Components Exam Questions, Groups T - FCC Rules, descriptions
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HAMTRONICS R313 VHF FM RECEIVER: INSTALLATION, OPERATION, & MAINTENANCE GENERAL INFORMATION. The R313 is the latest in a series of popular receivers for demanding applications which require exceptional
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HAMTRONICS R144 VHF FM RECEIVER, REV. 4/94: INSTALLATION AND MAINTENANCE FUNCTIONAL DESCRIPTION. The R144 is a premium commercial grade single-channel vhf fm receiver. It features a helical resonator front
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May 23, 1974 Diode Leakage In The, SB-101, HW-100-1 The silicon diodes used in the SB100 & SB101 are standard power diodes rated at 500PIV & 750MA. For each condition described, the diodes should be replaced
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A Mobile Communications MASTR II BASE STATION 806-824 MHz RECEIVER IF/AUDIO/SQUELCH & RF ASSEMBLY (25 khz/12.5 khz CHANNEL SPACING) TABLE OF CONTENTS RF ASSEMBLY, MIXER AND IF FILTER BOARD...... LBI-30482
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