[GreenKeys] SELCAL - Autostart

Wed, 28 Apr 2004 08:00:07 -0500

The Dovetron has a dual autostart circuit that permits operator selection of autostarting on a Marking carrier or on a RTTY signal with Mark-Space transitions. A third option is added to some units called "Digital Autostart" that looks for a specific valid character, (a space I think) before turning on the motor/magnets.

Dave, WW8S

----- Original Message -----
From: [email protected]
Date: Tue, 27 Apr 2004 21:57:06 -0700
To: [email protected]
Subject: Re: [GreenKeys] SELCAL - Autostart

> The Hal ST-6 turns on with strictly a carrier on the mark channel. 
> Turns on the printer as well.  20-30 seconds after loss of mark tone
> it'll shut down the motor on the printer unless you have the Auto-Auto
> Off in the auto off position.
> No other characters require for the turn on function.  Don't know about
> other Hal etc units but i suspect they pretty well operate in the same
> matter.  
> 
> Haven't read the manual on the Dovetron thru and thru yet but in
> watching the lights and listening to the carrier on the receiver, it
> appears to key up as soon as it sees channel tones.
> 
> What kind of TU requires characters to be sent before turning on?  Guess
> my knowledge base here is very limited.
> 
> Larry
> 
> 
> Eric Scace K3NA wrote:
> > 
> >    Pretty much every TU I ever came across would turn on when a carrier appeared and 12 LTRS had been sent.
> > 
> > -- Eric K3NA
> > 
> > -----Original Message-----
> > From: [email protected]
> > [mailto:[email protected]]On Behalf Of Bob Camp
> > Sent: 2004 April 27 21:56
> > To: greenkeys List
> > Subject: [GreenKeys] SELCAL - Autostart
> > 
> > Hi,
> > 
> > Another time issue in net operation is the carrier detect timing on the
> > TU. Obviously we can build a TU with about any time constant  We can
> > also transmit as much carrier as we need to in order to fire up the
> > carrier detect. We also want to be compatible with as much stuff as we
> > can be. So the question is -- how much carrier is enough to turn just
> > about any TU on? If we are setting up timing in PIC's and that sort of
> > thing we may need to identify this stuff a little more precisely than
> > we have in the past. Also if we are going to be building a new batch of
> > TU's it would be nice to know what to set up the carrier detect to act
> > on. Timing is everything .....
> > 
> >         Enjoy!
> > 
> >                 Bob Camp
> >                 KB8TQ
> > 
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> > 
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