Initial Test Equipment Control Settings; Transmitter Alignment Options; Reference Oscillator Warp; Figure 5-3. Reference Oscillator Warp Window - Motorola PR400 Basic Service Manual

Radio Alignment Procedures: Transmitter Alignment Options
5.3.1

Initial Test Equipment Control Settings

The initial test equipment control settings are listed in
Monitor Mode: Power Monitor
RF Attenuation: -70
AM, CW, FM: FM
Oscilloscope Source: Mod
Oscilloscope Horizontal: 10 mSec/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
5.4

Transmitter Alignment Options

Note: When checking the RF power output of the radio with a test set, always use a pad of
at least 30 dB attached to the radio end of the RF cable. This will avoid an RF
mismatch and ensure a stable RF reading that will not change with varying lengths of
connecting cable.
5.4.1

Reference Oscillator Warp

This is an important operation which affects all deviation values such as DTMF, MDC1200 Signaling
etc. The frequency will drift if not warped properly. Perform this operation prior to all other transmit
tuning operations in order to minimize heating and because of the impact of warp on signaling
operations.
6881096C24-A

Table 5-1. Initial Equipment Control Settings

Service Monitor

Figure 5-3. Reference Oscillator Warp Window

Table 5-1.
Test Set Power Supply
Speaker set: A Voltage: 13.2 Vdc
Speaker/load: DC on/standby:
Speaker Standby
PTT: OFF Volt Range: 20 V
Current: 20 A
5-3
July, 2004