Radio Tuning Setup; Radio Tuning Test Diagram; Initial Test Equipment Control Settings - Motorola GM338 Service Manual

Radio Tuning Setup

3.0 Radio Tuning Setup
A personal computer (PC), Windows 95/98 and a tuner program are required to tune the radio. To
perform the tuning procedures, the radio must be connected to the PC, radio interface box (RIB),
and test equipment setup as shown in Figure 4-4.
ACC
DC
RF
Mini UHF
to BNC
HLN8027
Figure 4-4 Radio Tuning Test Equipment Setup with External RIB
3.1

Initial Test Equipment Control Settings

The initial test equipment control settings are listed in Table 4-2.
Monitor Mode: Power Monitor
RF Attenuation: -70
AM, CW, FM: FM
Oscilloscope Source: Mod
Oscilloscope Horizontal: 10mSec/Div
Oscilloscope Vertical: 2.5 kHz/Div
Oscilloscope Trigger: Auto
Monitor Image: Hi
Monitor BW: Nar
Monitor Squelch: mid CW
Monitor Volume: 1/4 CW
Program/
Test Cable
RKN4083
+13,2VDC
Power
Supply
30 dB Pad
Table 4-2 Initial Test Equipment Control Settings
Service Monitor
Audio In
Test Box
RLN4460
DB15
RIB
RLN-4008
Cable 3080369B72 (9 PIN)
Cable 3080369B71 (25 PIN)
Transmit
Receive
Test Set
Speaker set: A
Speaker/load:
Speaker
PTT: OFF
Tx
Audio Generator
Rx
Sinad Meter
AC Voltmeter
Tx Data
Rx Data
Gnd
Service Monitor
or Counter
Wattmeter
RF Generator
ZWG0130336-0
Power Supply
Voltage: 13.2Vdc
DC On/Standby:
Standby
Volt Range: 20V
Current: 20A
4-3