TS-1755A/GRM-55A
Test Set for the PRC-25 Military Squad
Radio
©Brooke Clarke,
N6GCE
.
Purpose
The GRM-55 Test Set is designed to stimulate the PRC-25 with RF and
audio
signals and to measure the signals present on the module test
points.
The results of each test appear as a go (green light) or no-go (red
light).
Included with the test set is a cable to allow accessing the audio and
power lines of the PRC-25 POWER connector that also provides DC voltage
to the GRM-55. The box on this cable also has a jumper plug like the
one
on the radio so you should be able to power both the GRM-55 and the
radio
using any external source that has the correct plug like a test
adapter. There are no internal batteries.
A short BNC(m) to BNC(m) Cable is needed to use the GRM-55 but the
lid does not have clips to hold one.
Operation
Maintenance
On test sets that have not been used for some time the
rubber
gasket between the lid and case sticks to the case when the lid is
opened.
To fix this clean the case lip and apply a light coat of silicon grease
to the case lip and cycle the lid a few times.
Manuals
TM 11-6625-514-12
TM 11-6625-514-20P
TM 11-6625-514-45P
Use with other Radios
This test set should also work on the PRC-77
since the "POWER" and "ANT" connectors function in the same way and
most
of the module test points are the same. Has anyone done this?
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