Quantcast CHAPTER 9 MOUNTING  BASE,  ELECTRICAL  EQUIPMENT  MT-6353/VRC MAINTENANCE   INSTRUCTIONS (cont)

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Page Title: CHAPTER 9 MOUNTING BASE, ELECTRICAL EQUIPMENT MT-6353/VRC MAINTENANCE INSTRUCTIONS (cont)
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REPLACEMENT  OF  BATTERY  BOX  CASE.  Continued - TM-11-5820-890-30-5_662
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TM-11-5820-890-30-5 Ground Non-Icom Radio Sets Consisting of: Receiver-Transmitter Radio RT-1439/VRC (NSN 5896-01-195-0827) Manual
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Figure 9-1. PA Mount Schematic Diagram


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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