[Hammarlund] ITT modified SP-600

[Les Locklear]

This was taken from the Hammarlund SP-600 models page:

Another variant was the R-450/FRR-28. These were standard Hammarlund JX 
receivers that were modified by Northern Radio; USN stock no. F 
16-Q-112117-200, contract number Nobsr-52132, 19 December, 1950. These were 
designated SP-600-MX. Installed in a relay rack cabinet with a LS-187/UR 
speaker, AM-615/UR amplifier detector, KY-79 keyer, O-165/UR high stability 
oscillator, S-224/UR patch panel and an AN/URA-8 fsk converter-comparator. 
The X-tal frequency control at the top r.h corner was removed and covered 
with a Buships/Northern Radio order no. nameplate. Northern Radio located in 
New York City made many modifications available for SP-600's such as an IF 
gain control located where the dial lock was normally located. This was a 
very common military modification.

Les

-----Original Message----- 
From: Bob Camp
Sent: Friday, August 29, 2014 12:20 PM
To: kgordon2006 at frontier.com
Cc: Hammarlund at mailman.qth.net
Subject: Re: [Hammarlund] ITT modified SP-600

Hi

F.S. TELEG = Frequency Shift (Keying) Telegraphy. More commonly known as 
FSK.

Bob

On Aug 29, 2014, at 12:17 PM, Kenneth G. Gordon <kgordon2006 at frontier.com> 
wrote:

> Well, the data-plate associated with the BFO says, "MOD FOR I.S.B. AND
> F.S. TELEG."
>
> I know that ISB is Independent Side Band, but what, exactly, is F.S. 
> TELEG?
> Some sort of RTTY, I would suppose.
>
> Anyway, it is very interesting, and the receiver looks to be in excellent
> condition. I wish we knew fuller details of the mod.
>
> Price is way too much for me, though.
>
> Ken W7EKB
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