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Page Title: POWER SUPPLY. Continued
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TM 11-5820-890-30-5 4-2. POWER SUPPLY. Continued 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 These  outputs  are  short-circuit  protected.  The  power  supply  will  not  be  damaged  if  an  output  is  shorted  to ground. 4-3. AUDIO AMPLIFIER. The  audio  amplifier  performs  the  following  functions: Amplifies  the  audio  input  to  1  W  to  drive  a  loudspeaker. Amplifies  the  audio  input  to  200  mW  for  the  intercom  set. Detects  FSK  (TACFIRE)  tones  to  generate  the  required  control  signal. Additional  filtering  of  13  V  dc  line. A  functional  block  diagram  of  the  audio  amplifier  is  included  in  figure  4-1. a. One-Watt  Audio  Amplifier.  The analog receive (AR-A or AR-B) signals from the RT are amplified by the 1 W audio amplifier. The output level is determined by the RT VOL control setting. An input signal of 5.5 V rms will be amplified to 1 W into 600 ohms. The frequency response is from 300 to 3000 Hz. An analog switch is used to  attenuate  the  output  when  either  PTT  line  or  the  MUTE  line  is  grounded. b. Intercom Audio Amplifiers.  The analog receive signals from the RT are also amplified by the intercom amplifiers.  AR-A  and  AR-B  are  amplified  separately  to  200  mW.  The  output  level  is  determined  by  the  RT  VOL control  setting.  The  frequency  response  is  also  300  to  3000  Hz. c. FSK (TACFIRE) Detector. The FSK permits using one radio for audio and analog data. The analog data mode  control  (ADMC)  line  at  the  transmitting  RT  must  be  grounded  when  the  analog  transmit  (AT)  signal  is analog  data  and  AD2  is  used.  The  FSK  detector  does  this  for  the  user. It is a four-stage process. The AT signal is amplified to the required level. A notch filter attenuates all frequencies outside the 300 to 3000 Hz range. This prevents harmonics from triggering the tone detector. The tone detector checks for the 1200 and 2400 Hz FSK tones. If both are present and the FSK PRESENT signal passes to the output processing circuit, the output processing circuit begins when a PTT is received. The ADMC line is held open for 120 ms after a PTT. After 120 ms, the output of the tone detector is checked. If FSK tones were detected, the ADMC line is grounded until PTT is released. If the tones were not detected in the 120 ms period, the line is held open  until  the  PTT  is  released.  A  separate  FSK  detector  is  provided  for  AT-A  and  AT-B. 4-4. MOUNTING  ADAPTER  CHASSIS. The mounting adapter chassis provides the basic radio interconnections as shown in figures FO-14 and FO-15. Several  other  functions  are  also  performed.  The  power  input  is  switched  on  and  off  by  CB1.  EMP  protection  is provided by CR1 through CR6, VR1, VR2, and E9 through E15. The remote control transformers couple the RT and  control-monitor.  The  SNAP  line  driver  passes  signals  between  RT  A  and  the  SNAP.  Q1  and  R1  are electronically  part  of  the  voltage  regulator  on  the  audio  amplifier. 4-2


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