Realisitic
TRC-430
Documentation Project
CBTricks.com
Alignment
Procedure
Phase Locked Loop and CPU Section
A. Test Equipment Required
a. |
Frequency Counter |
b. |
DC Power Supply (13.8 Volt. 3 Amp.) |
c. |
DC Voltmeter |
d. |
Oscilloscope |
B. Alignment Procedure
Step |
Setting |
Connection |
Adjust |
Adjust for |
1 |
Frequency adjustment;
|
Frequency counter to output pin 12 of IC102 |
CT201 |
10.240MHz ± 100Hz |
2 |
RX VCO voltage adjustment MIC:
Receive |
Connect DC voltmeter between R204 and R206 |
L301 |
1.5V |
3 |
TX VCO voltage adjustment; MIC:
Transmit |
Connect DC voltmeter between R204 and R206 |
L301 |
Indication on DC voltmeter must be 1.0-2.0 Volt. If DC voltmeter does not indicate 1.0-2.0 volt, readjust L301 |
4 |
CPU IC Voltage check; MIC:
Receive |
Connect DC voltmeter to pin 2 of IC101 |
|
Indication on DC voltmeter must be4-5.5 volt |
5 |
CPU Frequency check; MIC:
Receive |
Connect oscilloscope to pin 16 of IC101 |
|
Check for 300-400kHz of triangle waveform |
Transmitter Section
A. Test Equipment Required
a. RF Powermeter (RF SSVM) |
f. DC Power supply (13.8 Volt, 3 Amp.) |
b. 50 ohm load (non-inductive) |
g. Spectrum Analyzer |
c. RF Attenuator |
h. Frequency Counter |
d. Oscilloscope |
i. Coupler |
e. Audio Generator |
B. Alignment procedure
Step |
Setting |
Connection |
Adjust |
Adjust for |
1 |
RF Driver stage; MIC:
Transmit |
Connect RF powermeter to base of Q305 |
L302 L303 |
Adjust for maximum indication on the RF powermeter. |
2 |
RF Power stage; MIC:
Trasmit |
Connect dummy load and RF powermeter to the EXT-ANT jack on the set |
L304 |
Adjust for maximum indication on the RF powermeter (4 watts). If indication is not in 4 watts range, go back to step 1 and readjust |
3 |
Modulation adjustment; MIC:
Transmit |
Connect audio generator(1kHz) to pin 4 of microphone connector Connect dummy load and oscilloscope through coupler to RF power meter. Connect RF power meter to EXT-ANT jack on the set adjust audio signal level to obtain 80%-90% modulation level. |
RV104 |
Check for proper modulation pattern on the oscilloscope. |
4 |
Second harmonic check; MIC:
Transmit |
Connect RE powermeter with dummy load to spectrum analyzer through coupler/-4OdB attenuator to EXT-ANT jack on the set |
|
At no modulation compare the level of fundamental frequency to the level of harmonic frequency. Suppression of the 2nd harmonic frequency level must be lower than-6OdB. Check for the other channels. |
5 |
Frequency check; MIC:
Transmit |
Connect dummy load and frequency counter through coupler to RF powermeter. Connect RF powermeter to EXT-ANT jack on the set |
CT201 |
Make sure that the indication of the transmitter frequency is 27.1 85MHz ± 300Hz on the frequency counter. |
6 |
TX Power LED adjustment; MIC:
Transmit |
Connect dummy load and frequency counter through coupler to RF powermeter. Connect RF powermeter to EXT-ANT jack on the set |
RV102 |
Adjust so that 3rd LED light up at 4 watts RF output power. |