Hi Henning,
Well, the BC-1206 had only three connectors in the rear, (+) and (-) for 28V DC (i.e. Gleichstrom), and an antenna wire connector. These sets used no directional antenna like a rotatable magnetic loop that is used in semi-automatic radio compasses or ADFs, and they were not interfaced with RMIs. They resemble a commercial Long Wave radio that you probably have at home. Lorenz beams were a much more sophisticated system. So the BC-1206 sets were not suitable for radio navigation that we know. From what I learned from the web is that these receivers were commonly installed in the aircraft when they were ferried from a factory to the field, and in many occasions these were the only radio sets on-board even large airplanes. Unless visually seen by the ATC, the ferry pilot or WASP was to wave the wings during VFR flights, and then the tower responded on pre-arranged frequency between 200 and 400 kHz giving instructions or weather information if necessary. Otherwise, homing commands were sent in the Morse code to the pilot, which was in that era widely known in aviation and maritime services.
Here are some more hints:
[URL unfurl="true"]https://www.usmilitariaforum.com/forums/index.php?/topic/271556-us-navy-marked-setchell-carlson-bc-1206-cm2-radio-range-receiver/[/URL]
[URL unfurl="true"]https://radio-quaderno.blogspot.com/2019/04/setchell-carlson-model-524-receiver-bc.html[/URL]
[URL unfurl="true"]https://www.avialogs.com/aircraft-n/north-american-aviation/item/4848-to-60je-43-replacement-of-range-receiver-bc-1206-with-radio-receiver-bc-453-b-f-51d-and-tf-51d-equipped-with-scr-522[/URL]
This is a must-read:
[URL unfurl="true"]https://worldradiohistory.com/hd2/IDX-Short-Wave/Monitoring-Times-IDX/00s/Monitoring-Times-2011-07-OCR-Page-0064.pdf[/URL]
