Tx Vco & Rx Vco Alignment - GE MLSH041 Maintenance Manual

ALIGNMENT AND TROUBLESHOOTING PROCEDURES
5.1.2 TX VCO & RX VCO Alignment
STEP
1
2
3
4
12
CMC-232A 29.7 - 42 MHz
METERING TUNING
POINT CONTROL
TP201 L206
Control
Voltage
Monitor
TP201 CV201
TP201
J201
NOTE: Refer to Figure 5 for location of tuning and adjustment controls.
Synthesizer
Figure 5 –
CMC-232B 42 – 50 MHz
METER
READING
4.0 VDC
In case highest transmit frequency is
< 34.0 MHz. Select lowest frequency
transmit channel. With 50 ohm load on
the antenna connector J1, key the radio.
Monitor TP201 with digital voltmeter
and tune L206 for 4.0 VDC ±0.1 V.
Unkey the radio.
In
7.0 VDC frequency is > 34.0 MHz. Select
highest frequency transmit channel.
With 50 ohm load on the antenna
connector J1, key the radio. Monitor
TP201 with a digital voltmeter and tune
L206 for 7.0 VDC ±0.1 V. Unkey the
radio.
7.0 VDC Select the highest frequency receive
channel. Monitor TP201 with digital
voltmeter and tune CV201 for 7.0 VDC
±0.1 V.
3.5-7.5 Select
VDC Voltage should be between 3.5 – 7.5
VDC transmit and receive for lowest
and highest frequency channels.
+1 to +8 RX/EX injection level should be
dBm between +1 and +8 dBm.
Tuning and Adjustment Controls
PROCEDURE
case the highest
lowest frequency
LBI-38438A
transmit
channel.