AIR VENTS
HANDLE
CONNECTORS
HOOK
TM5826-225-12-2
Figure 1-2. Radio Receiver R-1391 / ARN-83.
trical connector and at the other end by a locknut
1-10. Description of Receiver Mount
that engages a hook at the front of the receiver.
Two ground straps connect the two aluminum
The receiver mount serves as a shock isolator,
frames together for electrical ground continuity.
mating electrical connector support, electrical
power and signal distribution center, mount for a
1-11. Description of Control Unit
dc-to-ac inverter, and the means of securing the
receiver to the aircraft. The inverter accepts +27.5
volts dc and supplies 26 volts alternating current
a. The control unit remotely controls the receiver
and contains the necessary controls for selecting the
(ac) at 400 cycles per second (cps) for synchro
frequency range, tuning the receiver, and selecting
excitation. Mechanically, the receiver mount com-
all direction finder set operating modes. A tuning
prises two aluminum frames separated by five
meter indicates signal strength.
vibration isolators. One frame (base) is secured to
the aircraft with eight screws. The upper frame
b. The control unit is inclosed in a removable
dust cover and mounts on either the pilot's instru-
supports the receiver at one by the mating elec-
5
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