Jan,

Note the plug-in coil assmebly on the side of the Rx.  It could tune from 235 to 8000 KHz with the appropriate coils.

See attached.

73,
Al

On 2/16/2025 4:16 PM, [email protected] wrote:
Colleagues,

I've just found a reference on the Smithsonian Institution's website that the ARC Model D of 1929 was the first commercial navigation receiver. See here:

https://airandspace.si.edu/multimedia-gallery/14185hjpg

Does anyone know the specs of this set? Did it cover the 200 to 400 kHz range only?

73,

Jan SP5XZG
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ARK Sig Block Al Klase - N3FRQ
Jersey City, NJ
http://www.skywaves.ar88.net/