Transceiver Performance Testing; General; Setup - Motorola GM338 Service Manual

Section 3

TRANSCEIVER PERFORMANCE TESTING

1.0

General

These radios meet published specifications through their manufacturing process by utilizing high-
accuracy laboratory-quality test equipment. The recommended field service equipment approaches
the accuracy of the manufacturing equipment with few exceptions. This accuracy must be
maintained in compliance with the manufacturer's recommended calibration schedule.
2.0

Setup

Supply voltage is provided using a 13.2Vdc power supply. The equipment required for alignment
procedures is connected as shown in the Radio Tuning Test Setup Diagram, Figure 4-4.
Initial equipment control settings should be as indicated in Table 3-1. The remaining tables in this
chapter contain the following related technical data:
Table Number
Monitor Mode: Power Monitor
RF Attn: -70
AM, CW, FM: FM
Oscilloscope Source: Mod
Oscilloscope Horiz: 10mSec/Div
Oscilloscope Vert: 2.5kHz/Div
Oscilloscope Trig: Auto
Monitor Image: Hi
Monitor BW: Nar
Monitor Squelch: mid CW
Monitor Vol: 1/4 CW
3-2
3-3
3-4
3-5
3-6
Table 3-1 Initial Equipment Control Settings
Service Monitor
Title
Test Environments
Test Channel Spacing
Test Frequencies
Transmitter Performance Checks
Receiver Performance Checks
Test Set
Spkr set: A
Spkr/load:
Speaker
PTT: OFF
Power Supply
Voltage: 13.2Vdc
DC On/Standby:
Standby
Volt Range: 20V
Current: 20A
3-1