TM 11-5820-890-30-4
CONTROL,
Page
Subject
Principles of Operation . . . . .
CHAPTER 12
RECEIVER-TRANSMITTER C-11561(C)/U (RCU)
MAINTENANCE INSTRUCTIONS
. . . .. . . . . . . . . . . . . . . . . . . . . . ..
Repair Parts, Special Tools, TMDE, and Support Equipment . . . . . . . . . . . . . . .
Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . .
Maintenance Procedures
. . . . . . . . . . . . . . . . . . . . . . . . . .
Preparation for Storage or Shipment
. . . . . . . . . . . . . . . . . . . . . . . . .
Section I. PRINCIPLES OF OPERATION
Subject
Section
. . . . . . . .
I
. . . . . . . .
II
. . . . . . . . Ill
. . . . . . I V
. . . . . . ..
V
Para
Introduction
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12-1
Control Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ..
12-2
ICOM I/O Section
. . . . . . . . . . . . . . . . . . . . . . . . . . . .
12-3
Speaker Amplifier Section
. . . . . .. . . . . .. . . . . . . .. . . . . . . .
12-4
Power Supply (19A1)
. . . . . . . . . . . . . . . . . . . . . . . . . .
12-5
Front PaneI/Chassis (19A13) . . . . . . . . . .. . . . . . . . . . . . . . . . . .
12-6
Basic RCU Signal Types
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12-7
Analog Receive Signal Path . . . . . . . . . . . . . . . . . . . . . . . .
12-8
Analog Transmit Signal Path
.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12-9
Digital Data Receive Signal Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12-10
Digital Data Transmit Signal Path . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12-11
Speaker Operation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12-12
Primary Control Signals . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . .
12-13
Self-Test
. . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . .
12-14
Fill Operation .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
12-15
12-1. INTRODUCTION.
The RCU can be divided into five parts or functional sections. They are:
Control Section
ICOM I/O Section
Speaker Amplifier Section
Power Supply Section
Front Panel/Chassis
12-1
12-22
12-23
12-147
12-170
Page
12-1
12-4
12-5
12-9
12-11
12-13
12-15
12-15
12-16
12-17
12-18
12-19
12-19
12-20
12-21
Figure 12-1 illustrates the basic interconnections of the RCU sections. Figure 12-2 shows the partitioning of the
RCU.
12-1
