Receiver bandwidth:
Aural rf input sensitivity-Continued
Down 6 db at 200 kc . . Not less than 2.6 kc.
Antenna mode:
Down 60 db at 200 kc . Not more than 9.0 kc.
200 kc . ....... . . . . 50 microvolt per meter with
Down 6 db at 1,700 kc. Not less than 3.5 kc.
270-ƒ capacitor on sense
Down 60 db at 1,700 kc. Not more than 11.0 kc.
antenna input, 40 microvolt
per meter with 150-ƒ ca-
Receiver bfo . . . . . . . . . . . . . . Crystal oscillator.
pacitor on sense antenna in-
Frequency . . . . . . . . ...1425 kc (fixed).
put.
Audio output impedance .,600 ohms.
1,700 kc . . . . . . . ...22 microvolts per meter with
Audio output level . . . . Not less than 100 milliwatts
270- capacitor on sense
into a 600-ohm load with an
antenna input, 18 microvolt
rf input signal of 1,000 micro-
per meter with 150-ƒ ca-
volts per meter, modulated
pacitor on sense antenna in-
30 percent at 400 cps.
put.
Power requirements:
Loop mode:
Voltage . . . . . . . . . . . . . . .+27.5 1.0 volts dc.
200 kc . . . . . . . . . . . .100 microvolt per meter.
C u r r e n t . . . . . . . . . . ...2 amperes maximum,
1,700 kc . . . . . . . ...30 microvolts per meter.
Weight of complete
Receiver intermediate
equipment . . . . . . . . . . . . . . 18 pounds (less cabling).
frequency . . . . . . . . . . . . . . 1425 kc.
1-6. Components of Direction Finder Set AN/ARN83
1-9. Description of Receiver
1-7. Common Names
Listed below are nomenclature and assigned
a. The receiver is housed in a removable metal
common names for the equipment covered in this
dust cover provided with air vents. When the re-
manual.
ceiver is installed on its mount, it is secured at one
end by a hook and at the other end by a mating
electrical connector. A handle is provided for main-
Common Name
Nomenclature
tenance functions and transporting the receiver.
Connections to the loop and sense antennas are
Direction Finder Set
AN/ARN-83.
Direction finder set
made through keyed connectors at the front of the
Radio Receiver
receiver. Connections for power, signals, and re-
R-1391/ARN-83.
Receiver
mote control functions between the receiver and
Mounting MT-3605/ARN-83 . . . . Receiver mount
control unit are made through a connector at the
Direction Finder Control
rear of the receiver, which mates with another con-
C-6899/ARN-83.
Control unit
nector on the receiver mount.
Antenna AS-1863/ARN-83 . . . . . . Loop antenna
b. Physically, the receiver chassis is divided into
front and rear sections. The front section contains
rf circuitry and eight removable subassemblies. The
1-8. Description of Direction Finder Set
rear section contains synchros, motors, gear trains,
Direction Finder Set AN/ARN-83 consists of a
and a power supply and is hinged for access to these
receiver, receiver mount, control unit, and a loop
components. With the exception of power supply
antenna. The direction finder set is intended to be
transistors, all other transistors use sockets. The
used with a suitable sense antenna, a radiofrequency
internal regulated power supply is capable of sup-
(rf) inductance compensator, the necessary inter-
pressing power input voltage transients from -40
connecting cables, and a bearing indicator. Figure
to +80 volts direct current (de) about the nominal
1-1 shows all components of the direction finder set.
+27.5 volts dc required for operation.
4
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