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TM 11-5820-477-30
1-9. Differences Between Models
a. Local control units C-2329A/GRA-39, C-2329B/GRA-39 and C-2329C/GRA-39, and remote control units
C-2328A/GRA-39, C-2328B/GRA-39 and C-2328C/GRA-39 each have a call lamp on the front panel with an
associated control relay inside the housing, and radio frequency interference (RFI) filtering capability. The
C-2328A/GRA-39 and C-2329A/GRA-39 (comprising AN/GRA-39A), and the C-2328C/GRA-39 and C-2329C/
GRA-39 (comprising AN/GRA-39C), each have a sealed RFI filter assembly consisting of capacitors and
inductors. The C-2328B/GRA-39 and C-2329B/GRA-39 (comprising AN/GRA-39B) each have a sealed RFI filter
assembly consisting of capacitors and resistors. The basic model (AN/GRA-39) has no call lamp or RFI filtering.
b. The basic and A- models have identical wiring. The B- model component boards Al 02 and A201 have a
different printed wiring layout, resulting in different wire routing from P102 and P201 to the circuit boards. The C-
model is identical to the B- model.
c. The basic and A- models have been modified to add a 560-ohm resistor (R123) to improve monitoring when
Radio Set AN/PRC-25 is operated in the SQUELCH mode. This resistor was already a component of the B- and
C- models.
1-10. Equipment Data
Refer to TM 11-5820-477-12 for a description of the equipment and a listing of additional equipment required.
1-11. Safety, Care and Handling
Do not use ungrounded equipment. Throughout this manual are warnings, cautions and notes designed to protect
personnel and equipment. Learn the warnings on the warning page before attempting to install, operate or
perform maintenance on the equipment, and observe all warnings and cautions as you come upon them in the
text. Learn the applicable warnings and cautions associated with each item of additional equipment used in the
system, as outlined in their respective technical manual.
Section Ill. PRINCIPLES OF OPERATION
Para.
Page
Functioning of Remote Control Unit C-2328(*)/GRA-39 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Stage Analysis of Remote Control Unit C-2328(*)/GRA-39 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9
Battery Voltage Distribution, Remote Control Unit C-2328(*)/GRA-39 . . . . . . . . . . . . . . . . . . . . 1-11
Functioning of Local Control Unit C-2329(*)/GRA-39 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-13
Stage Analysis of Local Control Unit C-2329(*)/GRA-39 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-16
Battery Voltage Distribution, Local Control Unit C-2329(*)/GRA-39 . . . . . . . . . . . . . . . . . . . . . . 1-18
1-12. Functioning of Remote Control Unit C-2329(*)/GRA-39 (figures 1-3 and 1-4)
NOTE
The following discussion applies to all models of Control, Radio Set C-2328(*)/GRA-39,
except where noted.
1-5


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