====== P-718: AN/ARN-7 Radio Compass ======
**AN/ARN-7 Radio Compass**; manufactured by [[Bendix]].

{{:images:p-718-an-arn-7-components-bw.jpg?direct&400|P-718: AN/ARN-7}}
===== Technical data =====
  * [[Principle]]: automatic radio compass
  * [[Operation modes]]: [[A1]], [[A3|AM (A3)]]
  * [[Frequency range]]: 100 - 1,750 kHz (four ranges)
  * [[Sensitivity]]: [[A3|AM (A3)]] 40 μV / [[Selectivity]]: 

==== Power supply ====
  * [[Mains operation]]: (115 V)
  * [[Batteries]]: 24 V, 12 V aircraft electrical system

==== Dimensions ====
{{:images:p-718-an-arn-7-bw.jpg?direct&400|P-718: AN/ARN-7}}
  * Main unit BC-433-A: 200 x 305 x 500 mm, 21.25 kg
  * BC-434-A control box: 190 x 190 x 94 mm, 1.7 kg

==== Components / accessories ====
  * Main unit
  * Control Box
  * Loop Antenna LP-21-A, housed in an elegant streamlined metal cabinet
  * Display instrument I-81-A and I-82-A
  * Relay BK-22

===== Station material =====
{{ :images:p-718-an-arn-7-control.jpg?direct&300|P-718: AN/ARN-7}} The AN/ARN-7 radio compass, a successor of the [[P-716|SCR-269]] radio compass with automatic direction finding, was used in different kind of aircraft for navigation support. The total weight of the system was 34 kg. When tuned to a (long wave) beacon of an airfield or a broadcast radio transmitter (medium wave) with a known frequency and location, the corresponding bearing is shown in the display instrument.

===== Technical principle =====

==== Tube configuration ====
two VT66, one VT-74, four VT-86, one VT-87, two VT-93, one VT-94, one VT-96, one VT-105, two VT-109

==== Development ====
As the successor to the SCR-269 radio compass developed by Fairchild Electronics, the AN/ARN-7 was introduced into the US Air Force around March 1944.

==== Use ====

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===== Technical documentation =====

==== Further information ====