[GreenKeys] TT-523 (was Just out of high school...)

[Duncan Brown]

OK

I found the manual TM 11-5815-338-15 at 
http://radionerds.com/images/3/31/TM_11-5815-338-15.PDF
and read that the TT-523  just provided low-level on the off-line tape 
punching. When punching tape, it ran 68 ua through the keyboard contacts 
and the selector magnets were driven with 26 VDC at 20 ma. The manual 
warns that the keyboard contacts must be cleaned often!

The original date on the TM was 23 Oct 1967, but it includes change #4, 
dated 28 Feb 1980; showing that the TT-523 & TT-76 were still in use in 
1980 and expected to be used for a few more years.

Have fun,

Duncan
K2OEQ

On 17-Jul-17 10:51, Jeffrey Angus wrote:
>
>
> On 7/17/17 9:14 AM, Duncan Brown wrote:
>> Jeff,
>>
>> When were you working on the TT-523s?
> 1972 there about.
>>
>> We have one in the AWA Museum, but I never understood their real 
>> purpose.
>> I know they were for low-level (50-100uA?) signalling between the 
>> TT-76 &
>> crypto gear.  But in Viet-Nam (1967), we just connected out TT-76s 
>> directly
>> to the KW-7 crypto gear set to low-level and they worked fine.
> The big word was "Tempest."
> Even at 10-20 mA the local loop could be "heard" by the spooks.
> So the idea was to reduce it to a level where it was undetectable.
>
> At PEECO, we didn't actually manufacture anything. We made 4-5 units then
> went though "First Article Testing" to prove that they were 
> manufacturable
> at which point everything was turned over to a 3rd party for 
> manufacturing.
>
> Another member here sent me the one I have. It's souvenir of my first 
> "real"
> job and sits on my desk. At the shop, there's a Navy VOM that matches
> another of our "Make some and test them" projects
>
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