[Milsurplus] [MMRCG] Speculations on ground radios of the fifties

[Jim Whartenby]

Mike & JohnYes, I'm somewhat familiar with this SSB issue but didn't remember about the ARC-21 to ARC-65 conversion article.  Will have to compare the IRE article with the one in the RCA Engineer to see if there are any differences.  Thanks!
Interesting to note that the ARC-58 Reference Oscillator shown on page 1702 is vacuum tube powered not Germanium / silicon transistor powered which explains the use of B+ and a shunt Zener diode as the solid state power source.  I have never seen one so I doubt that it ever went into production.  It would be nice to have an example for the fun of it!Regards,Jim


Logic: Method used to arrive at the wrong conclusion, with confidence.  Murphy 

    On Thursday, April 30, 2026 at 10:46:38 AM CDT, Mike N2MS via groups.io <mstangelo=comcast.net at groups.io> wrote:   

 Here is the issue:

https://www.worldradiohistory.com/Archive-IRE/50s/IRE-1956-12-R.pdf


Mike N2MS

> On 04/30/2026 9:20 AM EDT John Vendely via Milsurplus <milsurplus at mailman.qth.net> wrote:
> 
> 
> Howdy,
> If I recall correctly, the ARC-21/ARC-65 conversion article was in the Dec. 1956 IRE Journal, which was a special single sideband issue. I have it around here somewhere and will try to dig it up. It also contained a detailed article about the ARC-58.
> Regarding the ARC-38A, I overhauled three of them back in the mid 1980s for use in a Lockheed P2V-7 owned by the Indiana Museum of Military History which we flew on the airshow circuit. I made many contacts and some phone patches back to the Museum on long flights, and we had a lotta fun with it. RCA did an excellent job on the SSB conversion, and I found the ARC-38A to be an excellent performer, though the SMO system did require the periodic TLC typically required of all synthesized sets of the time. An unsung feature of the ARC-38A was its very effective RF clipping speech processor, one of the earliest such processors I'm aware of.
> There was an excellent article on our restoration and operation of this aircraft in the April 1987 issue of Sport Aviation...
> 73, John K9WT


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