[GreenKeys] Basic autostart question

[Gary Chatters WA9ZZZ]

The web page at <http://www.rtty.com/development/tu/st-6/st-6.htm> 
explains how the ST-6 demodulator (TU) works.  Scroll down to the 
section titled "THE AUTOSTART SYSTEM" for an explanation of autostart.

Here is what happens:
- The AC power line for the TTY motor plugs in to the ST-6.
- The ST-6 listens for the appropriate tones.
- When tones (mark or space) are received a relay in the ST-6 closes and 
applies AC power to the motor.
- When the tones drop, after a delay the relay opens and stops the motor.

The relay is in the TU, not in the 15.

That is one way of doing it.  Not all TUs have autostart capability.

What kind of TU do you have?


73,
Gary
WA9ZZZ

On 7/10/19 7:24 PM, John Lawson wrote:
> 
> Greetings Greenkeys Friends -
> 
> I subscribed to GK for several years, several years ago.  Newly retired,
> I'm back to playing with some of my neglected toys.
> 
> I am currently running a Mod 15, Mod 28KSR, and Mod 33ASR.
> 
> A friend has a number of TTY machines, and I told him of ITTY. He would
> like to have his Mod15RO (with a nice ASSOCIATED PRESS placard on it) be
> operational with autostart -   wake up, print something, go back to sleep.
> 
> I have spent some time researching this, but the actual 'orthodox'
> electronic / electrical method of how ITTY communicates Autostart isn't
> clear yet. So given I have ITTY, and a working TU, loop supply, etc.,
> and a Mod15 - how does the relay
> 
> in the 15 know when to start, and stop, the motor?
> 
> I can copy ITTY FB, can read it using FLDIGI, and as soon as the 15 gets
> finished with it's lube/tweak/adj work on the bench, I'll use it and the
> 28 for printing ITTY in the shack.
> 
> 
> TIA!
> 
> John KB6SCO
> 
> Carson City
>