Hi

As the holder of a patent, you can allow folks to use your patented “thing” in their product. You can also tell them they can’t use it. When you allow them, sometimes they give you money for the right to use your “thing”. The way you allow them is to give them a license to use the patent. As a “big company” you likely already have licenses to various patents. They may be your own patents. You also might have done a “swap” with somebody for the license (I’ll let you use mine if you let me use yours ….). 

Stromberg Carlson was very much in the radio business right up to the point they split things up. At that point the radio group became part of General Dynamics. That GD group faded away and RF Communications (which became Harris RF) popped up in its place. Yes, that’s a *very* abbreviated / simplified version. 

Bob

On Feb 17, 2025, at 7:43 AM, [email protected] wrote:

Ray,

That's an interesting information. Could you please elaborate it further? What kind of license was necessary at the turn of the 1920s and 1930s to manufacture radios in the US? Was it related to the Prohibition times?

73,

Jan SP5XZG


W dniu 17.02.2025 o 13:39, raydio862--- via ARC5 pisze:

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: [email protected] <[email protected]> On Behalf Of [email protected]
Sent: Monday, February 17, 2025 7:33 AM
To: [email protected]
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, [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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