[Hallicrafters] SX-28 competitors in the 1940's

[Barry Hauser]

Gary Pewitt wrote :
> Aside from the SX-28 itself the RCA AR-88 was a very good receiver if 
> you   could get one.  Most went overseas to our allies.
> I sure like mine.  It has audio just as good as my SX-28A.  

That reminds me, Gary, when I referred to the AR88, I was thinking of the
whole series -- AR-77, AR88/AR88LF, CR91/91A.  The pre-war design was
established with the AR-77.  The differences between them are fairly
subtle.  I had also mentioned the E.H. Scotts, like the SLR and the RCH. 
I'm not sure which of these may have been sold non-military as they were
designed for low radiation -- back through the antenna and otherwise. 
Someone recently told me that conventional receivers could radiate their
local oscillator signals and probably mixer byproducts as far as 200
miles over the ocean.  Not too swell if you're trying to get your convoy
past the wolf packs.

This reminds me of another thing -- and then I'll stop -- promise ;-). 
On the back of the chassis of many Hallicrafters, and even the top 
turret cover of the Hammarlund SP-600's -- and many other radios, is some
boilerplate text with words to the effect "This equipment uses designs of
the Hazeltine Corporation and Radio Corporation of America .   " etc. and
then lists a bunch of patent numbers.

I believe this began sometime in the 30's and continued on into the 50's.
 Did RCA hold the patent on the superhet circuit?  Anybody know the
history on this?

Barry

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