[ARC5] ARC's first range receiver of 1929

[raydio862 at verizon.net]

At that time Aircraft Radio Corp. did not have license to manufacture radios covered by several patents so Stromberg Carlson built it for them.
Ray

-----Original Message-----
From: arc5-bounces at mailman.qth.net <arc5-bounces at mailman.qth.net> On Behalf Of zakariya.abu at yandex.com
Sent: Monday, February 17, 2025 7:33 AM
To: arc5 at mailman.qth.net
Subject: Re: [ARC5] ARC's first range receiver of 1929

Al,

Thank you very much indeed for the source information. Yes, I noted the plug-in coils module on the Smithsonian Institution's photo. What struck me was the Stromberg-Carlson's name seen just above the hand, and not the Aircraft Radio Corp.'s as suggested by the description on the Smithsonian Institution's website as below.

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

As far I as know, Stromberg-Carlson has always been into the telecom business, and acted as a contractor to make radio receivers for the military during WW II (eg. the BC-348). Does it mean that Stromberg-Carlson purchased the license or manufacturing rights from the A.R.C. to make Model D? I can't find a definite the answer in the 1930 QST piece.

By the way, A.R.C. later made a neat and compact Type 185 range receiver for the Navy, which covered  200 to 420 kcs.

73,

Jan SP5XZG

W dniu 17.02.2025 o 02:10, Al Klase pisze:
> 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, zakariya.abu at yandex.com 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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