Realisitic TRC453 Service Manual

Realistic TRC453
Documentation Project
CBTricks.com
TX Alignment Procedure:
Refer to ALIGNMENT POINTS
Equipment Required

a. AF Oscillator (two required) b. AF SSVM (Full scale: 1 V DC with RF probe) c. DC Ammeter d. RF Power Meter e. 50 ohm load and Attenuator | f. Oscilloscope g. RF SSVM h. Monitor Receiver or Spectrum Analyzer i. DC Power Supply (13.8 V/3 Amp.)

STEP | SETTINGS | CONNECTION | ADJUST | ADJUST FOR
1. | CH: 19, PA/CB: CB USB mode, TX S1 and S2: OFF | Break circuit at TP8 and TP7, place DC mA meter in series. | VR9 | Adjust for 40 mA.
2. | Same as step 1 | Break circuit at TP8 and TP6, place DC mA meter in series. | VR8 | Adjust for 30mA
After step 1 and 2, restore circuit at TP8 and TP7.
3. | Same as step 1 OSC1: 500 Hz OSC2: 2400 Hz S1, S2: ON | Set VR6 to Full clockwise rotation ALC "off" condition). Keep the AF ATT for approx. 20V reading on RF SSVM. | L37, 36, 35, 34 and 26 | Then adjust coils for max. reading. Repeat this adjustment several times, reducing the AF input level to the microphone circuit.
4. | Same as step 3 |  | L34, 35 and 36 | Adjust Coils for max, reading on RFSSVM. Check the power difference between CH1 and CH40, If it is over 1V on RFSSVM, readjust coils to obtain within 1 V.
5. | Same as step 1 AM mode OSC1 : 1 kHz S1 : ON, S2: OFF | Adjust level of OSC1 for 5mV reading on AF SSVM, | L26 | Adjust for maximum reading on RFSSVM.
6. | Same as step 1 S1, S2: OFF | Spectrum Analyzer or Oscilloscope. | VR4 | Adjust for minimum carrier leakage for both USB and LSB
7. | Same as step 3 OSC1 : 500 Hz S1, S2: ON | Adjust OSC1 and OSC2 for 5mV reading on AF SSVM, | VR6 | Adjust for 24.5V reading on RF SSVM.
8. | Same as step 1 AM mode S1, S2: OFF | RF Power meter. | VR10 | Adjust for 4.0W reading on RF Power meter.
9. | Same as step 8 | RF Power meter. | VR7 | Adjust so the 4 digits light on the Transceiver's meter.
10. | Same as step 5 | Adjust output of OSC1 for 200mV reading on AF SSVM | VR5 | Adjust for 95 to 98% modulation on Scope.

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