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====== P-716: SCR-269 Radio Compass ======
**SCR-269 Radio Compass**; manufactured by Fairchild Electronics.

{{:images:p-716-bw.jpg?direct&400|P-716: PCR-269-A}}
===== Technical data =====
  * [[Principle]]: automatic radio compass
  * [[Operation modes]]: [[A1]] (SCR-269-C only), [[A3|AM (A3)]]
  * [[Frequency range]]: 200 - 1,750 kHz (three ranges)
  * [[Sensitivity]]: [[A3|AM (A3)]] / [[Selectivity]]: 

==== Power supply ====
  * [[Mains operation]]: (115 V)
  * [[Batteries]]: 24 V, 12 V on-board power supply via converter MG-149-F

==== Dimensions ====
  * 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 BC-433-A
  * Control Box BC-434-A, two
  * Loop Antenna LP-21-A, housed in an elegant streamlined metal cabinet
  * Display instrument I-81-A and I-82-A
  * Relay BK-22-A

===== Station material =====
{{ :images:p-716-radiocompass.jpg?direct&300|P-716: SCR-269-A}}
The SCR-269 radio compass was used in aeroplanes for navigation, the weight of the entire system is 33.2 kg.

When tuned to a (long wave) beacon of an airfield or a radio (broadcast) transmitter (medium wave) on a known frequency, the corresponding bearing is shown in the display instrument. The pilot flies in the direction with a course deviation of 0°; when flying over the transmitter, the display changes to 180°.

The system consists of the actual BC-433-A receiver, one or two BC-434-A control units, the motorised adjustable loop antenna in a streamlined radome and accessories.

===== 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 ====
In 1942, the SCR-269 radio compass developed by Fairchild Electronics was introduced in the US Air Force.

==== Deployment ====
Emergency landings by B-24 Liberator bombers also made the technology of the radio compass known in Switzerland. After the end of the war, several systems were purchased; two complete systems (in order to be able to determine the location more precisely by double direction finding) were installed in each of the three Ju-52 aircraft, and two further systems in the Beechcraft C-45 of the Swiss national topography.

Eight SCR-269 G systems were thus procured after 1945.

{{gallery>:images?p-716*.jpg&0&80x80&crop&lightbox&showtitle&titlesort}}

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

==== Further information ====
  * [[https://www.radiomuseum.org/r/fairchild_radio_compass_scr_269f_g.html|SCR-269 on the website of www.radiomuseum.org]]