Midband (66-88Mhz) Tuning Procedure; General; Chapter 5C - Motorola GM-950 Manual

1.0

Midband (66-88MHz) Tuning Procedure

5C.2
1.1

General

The recommended hardware platform is a 386 or 486 DX 33 PC (personal computer) with 8 MBytes
RAM, MS-DOS™ 5.0, Windows™3.1, and RSS (Radio Service Software). These are required to
align the radio. Refer to your RSS Installation Manual for installation and setup procedures for the
required software; the user manual is accessed (and can be printed if required) via the RSS.
To perform the alignment procedures, the radio must be connected to the PC, RIB (Radio Interface
Box), and Universal Test Set as shown in figure 2-1.
MIC IN
PROGRAM/
TEST CABLE
GTF-374A
All tuning procedures are performed from the Service menu.
Before going into the Service menu, the radio must first be read using the File / Read Radio menu (if
the radio has just been programmed with data loaded from disk or from a newly created codeplug,
then it must still be read so that the RSS will have the radio's actual tuning values).
All Service windows read and program the radio codeplug directly; you do NOT have to use the RSS
Read Radio / Write Radio functions to program new tuning values.
Radio Tuning Procedure
SMA-BNC
58-80348B33
RADIO
TEST CABLE
GTF-376A
Note: Battery can be used in RIB
making power supply optional
25PIN
RIB
RLN-4008B
RIB POWER SUPPLY
EPN4041A (230 VAC. Euro)/
EPN4040A (230 VAC. UK)
Figure 2-1 Radio Alignment Test Setup.
Midband (66-88MHz) Tuning Procedure
30 dB PAD
TRANSMIT
30 dB PAD
BNC
RF GENERATOR
RECEIVE
AUDIO IN
TEST SET
RTX-4005B/
GTF180B
15PIN
COMPUTER INTERFACE CABLE
30-80369B72 (IBM "AT" 9PIN ONLY)
30-80369B71 (IBM "XT" 25PIN ONLY)
SERVICE MONITOR
OR COUNTER
WATTMETER
TX
AUDIO GENERATOR
RX
SINAD METER
AC VOLTMETER
COMPUTER
DATA
GND
5C.2-1