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TM 11-5820-890-30-5
CHAPTER 9
MOUNTING BASE, ELECTRICAL EQUIPMENT MT-6353/VRC
MAINTENANCE INSTRUCTIONS
Subject
Section
Page
Principles of Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . I
9-1
Repair Parts, Special Tools, TMDE, and Support Equipment . . . . . . . . . . . . . . . . . . . . . . . II
9-3
Troubleshooting Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Ill
9-3
Maintenance Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . IV
9-16
Preparation for Storage or Shipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . V
9-20
Section I. PRINCIPLES OF OPERATION
Subject
Para
Page
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1
9-1
Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2
9-1
PA Mount Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3
9-3
9-1.
INTRODUCTION.
The PA mount’s main sections are:
Power Supply (power supply).
Case, Power Supply (PA mount chassis).
They are described in the following paragraphs:
9-2.
POWER SUPPLY.
The power supply is mounted on the right side of the PA mount. It provides two basic functions:
It suppresses transients on the input power line.
It converts the dc input power into the dc voltages required by the power amplifier.
The input power must be 22 to 32 V dc. The current required depends on the output loads. Normally, 2 to 12 A of
input current is required. A block diagram of the power supply is included in figure 9-1.
a.
Transient Suppressor. The transient suppressor protects the radio from transients that may be on the
input power line. The transients, surges, and ripple on the input power line must be within the requirements of
MIL-STD-1275. The output of the transient suppressor is not short-circuit protected. If shorted to ground, CB1 will
trip. Its output is typically 0.5 V below the input voltage.
b.
DC-to-DC Converter. The output of the transient suppressor is fed into the dc-to-dc converter. It
provides the following regulated output voltage:
DC Output
Maximum
Maximum
Voltage (V dc)
Current (A)
Ripple (mV p-p)
6.75 (6.55 to 6.95)
1.5
75
13.0 (12.6 to 13.4)
4.3
75
200 (180 to 220)
0.008
3000
9-1
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