[GreenKeys] AN/SGC-1A ?

[eugene at hertzmail.com]

Anyone ever play with one of these? Looks like a neat item. Reading a description of it here:
http://www.armyradio.com/arsc/customer/product.php?productid=1652&cat=71&page=1
 
Whats with 500 and 700 Hz tones? 200Hz shift? Where/when was that used?
Sure is a good looking item!
Eugene
 
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