at 400 cps. It is required for indicating the bearing
connector and rf inductance compensator (para
or azimuth of a radio station. Typical bearing indi-
l13d) to the receiver.
cators are the ID-637/ARN and ID-250/ARN-30.
1-13. Additional Equipment Required
c. Electrical Cables and Connectors. Cables and
The following items are not supplied as part of
connectors are required for interconnections be-
Direction Finder Set AN/ARN-83 but are required
tween the receiver mount, control unit, bearing in-
for use with the set.
dicator, sense antenna, loop antenna, aircraft inter-
phone system, and primary power. The cabling is
a. Sense Antenna. The sense antenna is usually
originally fabricated and installed by the aircraft
a flush-mounted type, built into the aircraft or a
manufacturer.
T-type antenna constructed of large diameter wire
or tubing mounted on stantoff insulators at the bot-
d. Rf Inductance Compensator. The rf induct-
tom of the fuselage, parallel with the aircraft longi-
ance compensator, connected between the loop
tudinal axis. It supplies a nondirectional sense radio
antenna and receiver, compensates for any electro-
signal to the receiver. This antenna is originally
magnetic field distortion introduced into the an-
installed by the aircraft manufacturer.
tenna by the engines, wings, or other metal parts of
b. Bearing Indicator. A radio magnetic bearing
the aircraft. This field distortion, introduced in. one
indicator or a type which displays both the adf
or more quadrants, causes radio station bearings to
hearing and other navigational aids, such as very
be displaced from their true direction. Quadrantal
error varies with the aircraft configuration so the
high frequency omnidirectional radio range, (vor)
rf inductance compensator is selected during the in-
or compass information. is required. The indicator
stallation phase.
must be a synchro receiver operating on 26 volts ac
7
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