[GreenKeys] Re:

[sdaitch at mor.ibb.gov]

Tele-Signal was, I seem to recall, the prime contractor on the AN/FCC-19 and -25,
but these were generally used on microwave, wireline, or tropo radio systems.  I am not
sure if they were used on HF radio circuits.  The quick reference I found indicated these were made mid-1960s.

The -19 was 16 channels, one audio circuit TX and RX, the -25 was 32 channels, but required two audio circuits, TX and RX.  The -25 was simply a space saver package, and it may have saved a few items in the common equipment, maybe the loop current metering panel.  Without a picture, I just can't remember exactly the configuration.

We, at VOA Greenville, had some Northern Radio SS TTY mux units that may have been more for HF tone pack operations, since as best as I remember, there were some diversity options.  Early solid state gear, but we did not use them, instead we had earlier tube type NR systems on the VOA HF TTY circuits.  We did not use the full 16 channels, we used a high tone pair and a low tone pair, and the demod unit was also capable of diversity. Seems Type 107 rings a bell.  Gosh, I wish I had access to the pubs room in DC, I know where the books are (or were!)>

There was probably a lot more exotic equipment used elsewhere, especially UCC numbered equipment, gear that was not generally found on the Army side of things.  I think we need some Navy memory.

73
Sheldon

----- Original Message -----
From: "David I. Emery" <die at dieconsulting.com>
Date: Sunday, December 2, 2007 8:44 pm
Subject: [GreenKeys] Re:

> 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 
> systemswere 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 
> nearlya 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."
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