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Figure 2-1. AN/PRC-104 Controls and Indicators
Up
TM-11-5820-919-12 Radio Set AN/PRC-104(A) (NSN
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TABLE 2-2. AMPLIFIER/COUPLER CONTROLS AND INDICATORS


TM 11-5820-919-12
TABLE 2-1. RECEIVER/EXCITER CONTROLS AND INDICATORS
NOTE
Prefix reference designators with Al
Reference
Control/Indicator
Designator
Function
AUDIO connector
A4A2J1,
Interface connection with input/output devices
A4A2J2
FREQUENCY-KHZ switch
A4S1-A4S6
Selects 1 of 280,000 discrete frequencies between 2-
and 29.9999-MHz
SB switch
A4S7
Selects either USB (upper sideband) or LSB (lower
sideband) operation
MODE switch
A4S8
Selects four modes of operation:
V-RCV - Voice and cw receive only
V-TR - Voice and cw transmit and receive
D-TR - Data transmit and receive
D-RCV - Data receive only
VOLUME OFF/MAX
A4S9/R1
Turns power on or off and adjusts the audio level;
switch control
OFF removes power; MAX indicates maximum audio
level
LIGHT switch
A4S10
Illuminates FREQUENCY-KHZ readouts (with red
light) when pressed
Connector
J1
Interface connection with amplifier/coupler
increase, the antenna is open, shorted or otherwise
free of obstructions, adjust the antenna length, clear the
faulty.
tune fault and attempt a retune. If all efforts to tune fail,
the  antenna  tuner  is  defective.  If  a  spare
2-13.
NO-TUNE INDICATOR.
If the tuning tone
amplifier/coupler  assembly  is  not  available  and
continues for a very long time (8 thru 12 seconds) and a
communication is essential, refer to paragraph 2-15 on
beeping sound is heard after the tuning tone stops the
use of the bypass mode.
tuner has failed to tune and a tune-fault has occurred.
(The beeping tune-fault tone will also be heard if the
2-14.
VSWR INDICATOR.
If the antenna or its
operator selects a frequency below 2 MHz).  Turn the
radio off and then back on and momentarily press the
immediate  environment  is  disturbed  during  a
PTT switch to start a second attempt at tuning.  If a
transmission, its impedance will change and a high vswr
second tune fault occurs, the antenna is open or shorted
(unmatched) condition will occur. The antenna tuner will
or possibly not suitable for the frequency in use.  If all
measure the vswr at the beginning of the next
connections to the antenna are tight, no shorts are
transmission and will retune if the impedance change is
evident, and the antenna is
permanent.
A short beep at the beginning of a
transmission indicates a previous momentary high
2-3


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