Quantcast Figure 3-7. HF Control Panel (KCU-951)

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TM  55-1510-221-10 Figure 3-7. HF Control Panel (KCU-951) channel control from 1 through 99, displayed at the right end of the display window. (9.)  STO  (Store)  recessed  switch.  Stores displayed data when programming preset channels. (10.)  OFF-  VOLUME  control. Applies power  to  the  unit  and  controls  the  audio  output level. (11.)  SQUELCH  control.  Provides   variable squelch  threshold  control. (12.) CLARIFIER control. Provides 250 Hz of local oscillator adjustment. c.  Normal  Operation. (1.)  Turn  on  procedure: NOTE It  is  presumed  aircraft  power  is  on  and normally   used   avionic   circuit   breakers remain  depressed. NOTE Aircraft  can  be  configured  for  either  HF or  VOW  on  position  4  of  Audio  control panel (fig. 3-1). 1. AVIONIC   MASTER   POWER switch - ON. 2.  OFF-VOLUME  switch  -  Turn clockwise  out  of  OFF  position. Adjust volume as desired. (2.)   Frequency   operation   (Simplex   only): OFF-VOLUME Switch - Turn clockwise out of OFF position. Adjust volume as desired. 3-16

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