[Milsurplus] Off topic, missing pages

[Jim Whartenby]

"Stabilized Master Oscillator for Multichannel Communications" by E.W. Pappenfus, Electronics, December 1950
Pappenfus was one of the leaders in the Collins Radio ARC-58 program in the mid to late 1950's.  This article shows an ARR-15 PTO which was stabilized with some of circuit innovations that would later became the ARC-58 SMO.  Unfortunately the missing pages cover some of these circuits and early history.  
This article shows Collins Radio's interest in this technology many years before I thought.  Even the Collins Signal gave no hints, that I could find, about this earlier work.  When the 618S was announced in the Signal, Winter 1953, a SMO module was also mentioned that could replace the 144 crystal L.O. module.  
It seems that all 618S main chassis contain connectors and wiring that mate with the SMO and a 500 kc oscillator module needed to make the SMO function.  All of this is hidden under the 144 crystal L.O. module and is the basis of the Navy ARC-38.
I believe that there are only a few members of this fine list who would have an interested in this bit of Cold War Radio History.Even fewer when it comes to the earlier ARC-21 by RCA.Jim I wonder why people argue over the 10% of their differences and ignore the 90% they agree on?

      From: Hubert Miller <Kargo_cult at msn.com>
 To: "Milsurplus at mailman.qth.net" <Milsurplus at mailman.qth.net> 
 Sent: Wednesday, July 25, 2018 11:01 PM
 Subject: Re: [Milsurplus] Off topic, missing pages
   
Jim - just curious - what was the article about ?  I ask because 'Electronics'  had some interesting articles on WW2 electronics equipment.
-Hue 

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