[Milsurplus] Mystery FSK/DFSK demodulator CV-2310/G

[Sheldon Daitch]

Nick,

not sure what DFSK means, but I wonder if it means diversity FSK?

Way back when we ran the HF RTTY schedules at the Greenville VOA
operations, we used audio frequency diversity on those RTTY circuits.

I am in TDY status and have much slower internet access and can't 
verify the models.  We used a low set of tones and a high set of tones
on the Northern Radio tone keyers, both keyed with the same 
TTY keying.  We used the NR Type 174 (I think) which matched
the same set of tones and there was a comparator circuit in the demodulator
using both sets of tones to determine whether the pulse was a mark or space.

Whether or not that is how the CV-2310 is set up, don't know. 

73
Sheldon

________________________________________
From: milsurplus-bounces at mailman.qth.net [milsurplus-bounces at mailman.qth.net] on behalf of Nick England [navy.radio at gmail.com]
Sent: Sunday, November 25, 2012 9:04 PM
To: Military Surplus Mail List
Subject: [Milsurplus] Mystery FSK/DFSK demodulator CV-2310/G

Howdy men. I received a mystery item photo today - CV-2310/G FSK/DFSK
demodulator
Photos at http://www.navy-radio.com/puzzlers.htm#cv2310
I suspect it may be an NSA signals intercept gadget given the ID tag,
odd shift freqs, and DFSK (did the US military ever use DFSK?)
Any info greatly appreciated.
Cheers,
Nick K4NYW
www.navy-radio.com
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