AN/ARN-7 Radio Compass; manufactured by Bendix.

• Principle: automatic radio compass
• Operation modes: A1, AM (A3)
• Frequency range: 100 - 1,750 kHz (four ranges)
• Sensitivity: AM (A3) 40 μV / Selectivity:

• Mains operation: (115 V)
• Batteries: 24 V, 12 V aircraft electrical system

• 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

• 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

The AN/ARN-7 radio compass, a successor of the 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.

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

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.