TM 11-6625-2709-12
Function
Control, indicator, or connector
Provides a connection for an audio output meter.
AUDIO (two jacks)
PHONE jack
Provides a connection for headphones. When the headphone plug is
connected, the PHONE jack disconnects the AUDIO jacks to eliminate
double loading of the audio output circuit of the receiver.
DEVIATION control
Used for test and adjustment of the flag and meter movements.
DEVIATION (meter)
Indicates the direction and amplitude of the deviation current from the
receiver.
FLAG LOAD (switch)
Used to test flag load on glidescope and VOR/LOC tests.
NOTE
The normal switch position for VOR/LOC testing is position 4. Position 5 is wed when checking the FLAG LOAD output of
.
the R-1388A/ARN-82
FLAG meter
Normally indicates the amount of flag current from the receiver.
VOR/LOC 2A fuse
Provides 2-ampere protection for the 27.5-volt dc line to the receiver.
VOR/LOV lA fuse
Provides l-ampere protection for the 115-volt, 400-Hz line to the receiver.
GS lA fuse
Provides l-ampere protection for the 27.5-volt dc line to the glideslope
receiver.
TO-FROM meter
Indicates the direction and amplitude of the to-from current of the
receiver.
MARKER BEACON (lights)
C h e c k s the circuits for the middle marker beacon.
MIDDLE (amber)
Checks the circuits for the outer marker beacon.
OUTER (blue)
Checks the circuits for the airway marker beacon.
AIRWAY (white)
Selects marker beacon rf input sensitivity.
MARKER BEACON (SENS)
b. Control Unit
Function
Control or indicator
Power switch (2-position rotary
concentric with megahertz selector)
OFF
Removes primary power from the receiver.
Applies primary power to the receiver.
TEST
Sets the receiver in a self-test mode.
Megahertz selector
Tunes the receiver in l-MHz increments.
Kilohertz selector
Tunes the receiver in 50-kHz increments
Frequency indicator
Indicates the frequency to which the receiver is tuned.
VOL control
Controls the audio output level of the receiver.
Change 1 2.5
