[GreenKeys] Fwd: The Flying White House 1947

[COURYHOUSE at aol.com]

Duncan -   if  you  could do a wider tonal scale  scan  drop us a copy 
please...
 
Ed# _www.smecc.org_ (http://www.smecc.org) 
 
In a message dated 2/18/2012 8:03:48 P.M. US Mountain Standard Time,  
duncanancy at earthlink.net writes:

I just  received the original photo from Don - it is going to the AWA  
Museum.  Looking at the photo with a magnifying glass, I can see a  
little more detail than was available on the scans.

The unit behind  the operator's head is definitely a diversity FSK 
receiving  converter.  I can make out the meter switch markings and they 
are  things like "Chann B"; "Chann A + B"; "Polar"; "Neutral"; etc.  I 
was  then able to identify the converter as of the FRF & CV-31/TRA-7 
family  (although a slightly different configuration).

Below the CV-31 is a  BC-348 receiver (must have been another one unless 
they were using one of  the ARC-5 receivers for diversity).

Below the BC-348, I can just make  out another chassis with a large shiny 
dial.  This might be the FSK  modulator - something like the O-79/TRA-7 
used (along with the CV-31) in  the AN/MRC-2 in this time period (and 
later in the early  AN/GRC-26s).  So maybe the ART-13 was running true 
FSK (but where is  the other coax - on the other side of the ART-13?)

In looking up the  O-79, I came across an interesting document: "Military 
Teletypewriter  Systems of World War II" at   
http://www.nonstopsystems.com/radio/article-AIEE-1948.pdf
(I was  surprised to learn that there was some Multi-Channel, Independent  
Sideband, radio teletype used on high volume circuits during WWII and  
that the Bell system had been using it prior to WWII.)

On the front  of the SIGNIN, between the keyboard and paper tape reel is 
something that  looks like a perforated tape reader.  So there must have 
been an  "Iron Horse"/GPE perforator somewhere.

Have  fun,

Duncan



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