[GreenKeys] modifications

[Edward Greeley]

As early as 1970 the USAF was using TEMPEST configured model 28 ASRs 
known as AN/UGC-54 as AUTODIN Mode V (mode 5) terminals in small comm 
centers. The UGC-54s were configured much as you describe, and with the 
whole suite of TEMPEST modifications including extensive shielding and 
low level keying. If I remember correctly, many larger comm centers also 
had at least one UGC-54 as a standby/backup unit in case part of the 
somewhat unreliable DSTE (Digital Subscriber Terminal Equipment) failed. 
I don't remember if the LESU 60 was the low-level LESU or not.

Ed Greeley

John Duggan wrote:
> Hello Dave,
> 
> I never even heard of an AUTODIN machine until
> recently, George identified the machine that I have,
> it has two T.D.'S One (inboard) is a parallel unit
> (LX3)the outboard T.D. is a standard LXD, it had at
> one time a LARP aux parallel reperforator, the LESU is
> unfamiliar type to me as well(LESU 60), this unit was
> used for crypto, but no TEMPEST stuff inside, a very
> strange lady indeed, I have no idea where this machine
> originated from, but I will do my best to get Her on
> the the air, or die trying, my Wife has threatened me
> with death over Teletype equipment that has migrated
> into the house, smells good, though.
> 
> 73 DE KG6EOT
> John Duggan
> 916.708.3103
> pix at http://picasaweb.google.com/kvmr895
> --- NNN7DXB at aol.com wrote:
> 
> 
>>HI:
>>
>>When you say "AUTODIN M28",  what specifically are
>>referring to?
>>
>>The only difference between a M28 and a M28 used in
>>military AUTODIN
>>was the addition of a low-level signaling device for
>>TEMPEST, otherwise
>>it's a standard M28.
>>
>>FYI, the military called them AN/FGC-58s (without
>>the low leveling
>>signaling devices).
>>
>>Afterf 1980, when the low level signaling devices
>>were added (as
>>modifications), they were renomenclatured as
>>AN/FGC-171s.
>>
>>AUTODIN = CommCenter
>>
>>Dave F
man.qth.net/mailman/listinfo/greenkeys
>