[GreenKeys] 28 KSR SKINTIGHT AUCTION

[Nick England]

I feel extremely hesitant matching wits with W7TTY, but both the Navy
TTY manuals and the TT-176 in my shack respectfully disagree. It is a
pretty normal high-level current loop unit, non-Tempest, no armored
cable, or mil connectors. It just is packaged to fit within a 19"
rack.
The LESU sits on the back of the mounting plate with a cover -
underneath it looks like a regular ole Teletype Corp. LESU and
connections are via the usual terminal strips.
http://www.navy-radio.com/tty/tt176-02.jpg

I listed the components for various TT-176 models in a previous e-mail
to the list.
BTW, I have no connection to the seller, just am a happy TT-176
owner/operator who was amazed to see one languishing at $0.99 no-bid!

cheers,
Nick K4NYW
www.navy-radio.com



On Wed, Jun 22, 2011 at 2:57 PM, George B. Hutchison <w7tty at olypen.com> wrote:
> I believe that the TT-176 is a Tempest Unit, with cheesy model 32
> style keyboard, optical distributor in the left rear corner, and
> half-amp selector magnet coils and the mu-metal shield over the
> magnets.
>
> All wiring is in shielded/armored cable, and has three pin military
> connectors. I think the Electrical Service Unit is referred to as a
> "bustle".
>
> I believe the seller, "ipullgees" is possibly a former greenkeyer
> who is either a fighter pilot or test pilot. This is good, as I
> recall the man having some good taste in gear.
>
> Dealing with Tempest stuff is a different world. Those with ST-8000A
> TUs are fortunate in that one of the output sigs from the ST-8000A
> is Mil-188, which is what the tempest world is all about. It's kinda
> like RS-232, except that the signal excursions are limited to plus
> and minus 6 volts, and is inverted, I.E. Mark = Plus 6 volts, and
> Space =  Minus 6 Volts. Works just fine with NPN keying transistors.
>
> W7TTY
>