[GreenKeys] 28 KSR SKINTIGHT AUCTION

[Chris Elmquist]

Thanks Guys...

So, the unit up for auction is also known as TT-176 then?

And the LESU is the external box behind the typing unit?

What's the "L" in LESU?

L'ectrical External Service Unit?
Little Electrical Service Unit?

Chris N0JCF

On Wednesday (06/22/2011 at 03:33PM -0400), Nick England wrote:
> 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
> >
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-- 
Chris Elmquist