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;


MIC: Receive
Volume: Optional
Squelch: Optional
CH Selector: Optional

Frequency counter to output pin 12 of IC102

CT201

10.240MHz 100Hz

2

RX VCO voltage adjustment

MIC: Receive
Volume: Optional
Squelch: Turn Clockwise
CH Selector: 1
CH9: OFF

Connect DC voltmeter between R204 and R206

L301

1.5V

3

TX VCO voltage adjustment;

MIC: Transmit
Volume: Optional
Squelch: Optional
CH Selector: 1
CH9: OFF

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
Volume: Optional
Squelch: Optional
CH Selector: Optional
CH9: OFF

Connect DC voltmeter to pin 2 of IC101

Indication on DC voltmeter must be4-5.5 volt

5

CPU Frequency check;

MIC: Receive
Volume: Optional
Squelch: Optional
CH Selector: Optional
CH9: OFF

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
Volume: Optional
Squelch: Optional
CH Selector: 19
CH9:OFF

Connect RF powermeter to base of Q305

L302

L303

Adjust for maximum indication on the RF powermeter.

2

RF Power stage;

MIC: Trasmit
Squelch: Optional
Volume: Optional
CH selector: 19
CH9: OFF

Connect dummy load and RF powermeter to the EXT-ANT jack on the set

L304
L305
L306
L307

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
Volume: Optional
Squelch: Optional
CH Selector: 19
CH9: OFF

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
Volume: Optional
Squelch: Optional
CH Selector: 19
CH9: OFF

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
Volume: Optional
Squelch: Optional
Channel selector: 19
CH9: OFF

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
Volume: Optional
Squelch: Optional
Channel Selector: 1
CH9: OFF

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.