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[aprssig] APRS touch-tone and PL and repeaters?

The Bland Ranch root at blandranch.net
Wed May 6 14:11:11 UTC 2009


Commercial repeaters (Motorola I know best) have been able to handle multiple
PLs for quite a while. The controllers may be another issue.

A consideration when doing such things is that while you are sending your tones
and the repeater TX is not active, someone may think the repeater is not in use
and TX on top of you. The questions is, how often might this happen?

A possible work-around is to have the different PL still key the TX but with no
pass-through audio. At least others would know the RX is in use.

The idea is plausible, with a little tweaking.

Chuck Bland
NA6BR

Quoting Robert Bruninga <bruninga at usna.edu>:

> >> Every DTMF APRS user pre-sets his callsign 
> >> into a DTMF memory so that he can send it 
> >> wherever and whenever.  
> > 
> > I thought, perhaps you were proposing to also 
> > require a single special (a.k.a. "standard") 
> > PL to inhibit the DTMF from escaping on the 
> > repeater output, or something-or-other like that.  
> 
> Hummh... Now that is an idea...
> Do the controllers on repeaters with PL (CTCSS) on their input
> still hear everything on the channel?  What about control codes
> form DTMF?  My very limited experience would suggest that these
> repeater controllers are operating the repeater input with OPEN
> SQUELCH in order to have a fast reaction, and then only use the
> presence of PL to decide when to bring up the output and
> patch-over the audio.
> 
> So having a unique PL on the APRStt DTMF string would pevent the
> repeater from coming up, but would all those DTMF tones still
> potentially scrmable the repeater controller's DTMF decoder?
> 
> Good question.  If repeater controllers, on the other hand, are
> immune to DTMF codes that do not match their PL, then maybe you
> have just opened up a potential way that could make it easy to
> add APRStt to some repeaters.
> 
> Bob, WB4APR
> 
> > 
> > > Having random people sending random digits on random 
> > repeaters scares the
> > > begesus out of repeater owners.  So we have abandoned that
> idea
> > > and are going with setting it up on a simplex frequency.
> > 
> >    Roger on the begesus O.M.   So it's the APRStt idea itself 
> > that raised a few neck-hairs.  Yea, I can see that concern.  
> > Bleep, bleep, bleep all the time...
> > 
> > -- 73, Steve, K9DCI  Wouldn't that be Bejesus, anyway?  
> > (capitalise a proper name. hi hi)
> > 
> > 
> > 
> > 
> > 
> >       
> > 
> 
> 
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