[GreenKeys] AK-1 AFSK generator

[Randy and Sherry Guttery]

On 1/25/2012 9:31 PM, Roy Morgan wrote:
> The TMC TIS-3 is such a unit. Uses 12AX7's and the like. 
> TIS means Tone Intelligence System. (There may well have 
> been a TIS-1 and TIS-2 but I am unfamiliar with them.)

Yes - the TIS (no "1") is a modular four to sixteen channel 
"on-off" key to tone system - i.e. multiplex.

The TIS-2 is designed to put a single fixed 850cps shift 
AFSK TTY signal on one sideband- and a CW signal on the 
other sideband (i.e. two independent data channels).

And to confuse matters even more - there are two distinct 
TIS-3s - the TIS-3 TTF/TST - and the TIS-3/TH and TIS-3A/TH 
(the "A" is a minor variant of the "non-A").

The TIS-3 TTF/TST is nearly identical to the TIS-2 except 
the offsets are for standard 1Kc channel (RF) tuning (i.e. 
center and shift frequencies are fixed).

The TIS-3/TH (and A) are a single data channel source - 
however - they can handle analog signals (FAX) as well as 
on-off keyed (CW or TTY) signals. There are three "standard" 
center frequencies with "dial-in" shift from 12 - 1000cps.  
In analog mode (FAX) - the carrier can be shifted up to 
1200cps - on a 0-20V input swing.

Probably more than you wanted to know [evil grin!]

best!

-- 
randy guttery

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