Service manual

Chapter 6 Radio Alignment Procedure
6.1 Introduction
This section describes both receiver and transmitter radio alignment procedures using either of the
following radio alignment software:
• ASTRO Digital Spectra Radio Service Software (DOS-based)
• ASTRO Digital Spectra and Digital Spectra Plus Tuner software (Windows-based)
6.2 RSS
6.2.1 ASTRO Digital Spectra
An IBM or IBM PC-compatible computer and radio service software (RSS) are required to align the
ASTRO Digital Spectra radio. Refer to the applicable RSS manual for installation and setup
procedures for the software.
To perform the alignment procedures, the radio must be connected to the computer, radio interface
box (RIB), and a universal test set as shown in
Figure 6-1.
Figure 6-1. ASTRO Digital Spectra Radio Alignment Test Setup
All service and tuning procedures are performed from the SERVICE menu, which is selected by
pressing F2 from the MAIN MENU.
Figure 6-2 illustrates how the RSS alignment SERVICE screens
are organized.
RIB
COMPUTER INTERFACE
CABLE
DATA
BUSY
GND
COMPUTER
AUDIO GENERATOR
SINAD METER
AC VOLTMETER
TX
RX
COMMUNICATIONS
ANALYZER
AGILENT 8901B
MODULATION
ANALYZER
COMMUNICATIONS
ANALYZER
(MODOUT Connector)
WATTMETER
MAEPF-27245-O
RADIO
SET TO APPROX. 80mVrms FOR MAXIMUM DEVIATIO
N
MATCHING
TRANSFORMER
CONTROL
HEAD
TEST
SPEAKER
DUMMY
MICROPHONE
RF PORT
RADIO-TO-RIB CABLE
RF
ATTENUATOR
COMMUNICATIONS
ANALYZER
Vert/SINAD Dist/
DVM Counter
OR
OR