[GreenKeys] Re:

[David I. Emery]

On Sun, Dec 02, 2007 at 01:12:23PM -0600, Randy or Sherry Guttery wrote:
> >	Some of the signals used frequency diversity within the tone
> >pack with two tones (usually 8 tones apart) keyed with the same traffic.
> >And of course there were quite a few signals that used frequency
> >diversity at various times during the day with the same tone pack on
> >more than one RF channel.
> 
> Sounds like the AN/UCC-1C systems.

	That number is vaguely familiar...

> I don't recall the designation (yeah 30+ years - some things just fade 
> away) but IIRC some of these were TeleSignal Corp. systems - (again 
> IIRC) the models carried a model numbers like 101, 102 and 107-C.

	I know the major manufacturer of mux gear for this in the late
60s was Telesignal - and that their stuff had various mil designations
as well..  typically rack mounted  with 16 channels on side by side plug
in receiver cards - I think I remember 8 channels over 8 channels.

	An old boss in my first summer engineering job (at Codex in
1966)  had a Telesignal mux rack at home (or at least some of the cards)
and used it with a couple of R-390As and a 28 to look at these signals.
I had already been successful earlier at demoding a couple of tones on
some signals, but he was quite helpful in  describing how these systems
were used in practice and what the actual technical standards were.   I
believe he actually drummed up some business for the company (which at
the time made forward error correcting encoder/decoders based on early
digital logic technology) by finding circuits that could benefit from
error correction and selling them a box (he had designed) to do it.

> NSA & NASA had several modified R-390A models with outboard high 
> stability osc. , etc. for "intelligence gathering".   Some of these were 
> automated and could be remotely controlled so a radio could actually 
> "chase" a signal. One model actually reach "production" levels and 
> received the designation of R-1274.

	I have seen that number from time to time and definitely saw a
pair of those R-390As at a flea around 1990 (in nearly new condition
selling for almost nothing).   They had BNCs on the back for all the
oscillators and they made have had a companion unit with them that
generated some of them.   I wondered who used them (aside from the
obvious suspects)...

	I know the big HF sites used stuff like the FRR-59 and TMC
DDR-2s/WRR-2 for these before the R-1051 era... those radios were nearly
a full rack and probably weighed 300 lbs... and fully synthesized.

	And I know TMC made an electronic tracking AFC setup back then
to compete with the CV-157...


-- 
  Dave Emery N1PRE/AE, die at dieconsulting.com  DIE Consulting, Weston, Mass 02493
"An empty zombie mind with a forlorn barely readable weatherbeaten
'For Rent' sign still vainly flapping outside on the weed encrusted pole - in 
celebration of what could have been, but wasn't and is not to be now either."