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[aprssig] European 1750 question?

Dave Baxter dave at uk-ar.co.uk
Tue Jun 22 13:38:27 UTC 2010


Hi Steve.

It wasnt a question, but a response to someone asking about the repeater standards used, so they could put more suiatble info on APRS objects, that would be meaningfull for D700/D710 users.

But as usual, the toppic thread got hijacked somewhere along the line.

Cheers and beers.

Dave.
 

> -----Original Message-----
> From: Steve Noskowicz [mailto:noskosteve at yahoo.com] 
> Sent: 21 June 2010 16:15
> To: TAPR APRS Mailing List
> Subject: Re: [aprssig] European 1750 question?
> 
> 
> 
> Mornin' Dave,
> 
> I'm not sure what your real question is, but...
> 
> > ... we use the term CTCSS "Continuious Tone Coded Subaudiable 
> > Squelch", I think in the US you call it "Pilot tone" or "PL".
> 
> It's been a while since I worked on this, but as I recall, we 
> called it "Continuious Tone Coded Squelch System".  I seem to 
> remember that this was the international stantard's title.  
> Although I see from a current search on "CTCSS", your version 
> is also used.
> 
> "PL" is Motorola's "Private Line"
> IIR GE was "Channel Guard".  
> 
> 
> The Wiki article appears to explain pretty well, though I 
> didn't read it all.
> 
> http://en.wikipedia.org/wiki/CTCSS
> 73, Steve, K9DCI
> 
> 
> > Most of
> > the such equiped boxes will only radiate the tone on the 
> output, when 
> > they are actually in use, not when just waking up to send an ID.
> > 
> > On 70cms, things seem a little different, like no real 
> changes, other 
> > than the addition of CTCSS access in many places.
> > There are no (that I
> > know of) 12.5k channels used by us, as they are used by the 
> "Primary 
> > User", it's a shared band here.
> > 
> > Note though, that some of the published information regarding which 
> > tone to use, is often way out of date, and some that have a 
> tone shown 
> > as allocated, don't use it, such as GB3VA on 2m, that has no CTCSS 
> > systems at all.  (And never will, I'm
> > told.)   You'll also find lots of
> > repeaters listed, that just do not exist any more, due to site 
> > ownership changes, and the rental going sky high as a result..
> > 
> > Cheers.
> > 
> > Dave G0WBX.
> > 
> > 
> > > -----Original Message-----
> > > From: Pentti Gronlund [mailto:pentti.gronlund at tut.fi]
> > 
> > > Sent: 18 June 2010 16:38
> > > To: bruninga at usna.edu
> > > Cc: aprssig at tapr.org
> > > Subject: Re: [aprssig] European 1750 question?
> > > 
> > > Robert Bruninga writes:
> > > 
> > > > In Europe (or anywhere else that whistle-up
> > repeaters are used)...
> > > 
> > > Company-radio makers like Motorola call it single-tone
> > access...
> > > 
> > > > Are ALL of these 1750 repeaters now
> > narrowband?  (meaning 2.5 KHz
> > > > deviation or whatever is the European
> > standard?).
> > > 
> > > Narrowband is quite rare. I believe it has been made 
> compulsory in 
> > > the UK and in Germany, everywhere else
> > there
> > > can be narrowband machines but the default is wideband
> > (3.5
> > > kHz nominal/5.0 kHz peak).
> > > 
> > > > Reason I ask, is that the APRS Freq Spec normally
> > adds Txxx
> > > or Dxxx or
> > > > 1750 in a four byte field to indicate the type of
> > squelch.  But it
> > > > also uses the FIRST letter to indicate wide or
> > narrow band
> > > operation.
> > > > SO in the USA, we use Txxx or Dxxx.  But in
> > narrowband
> > > countries they
> > > > would be txxx or dxxx.  But what about
> > 1750?
> > > > 
> > > > Can we say that it now ALWAYS implies
> > narrowband?
> > > 
> > > Nope.
> > > 
> > > Benjamin OH3BK
> > > --
> > >         Live Reports
> > from the Taxman's Paradise!
> > > 
> > > 
> > > 
> > 
> > _______________________________________________
> > aprssig mailing list
> > aprssig at tapr.org
> > https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
> > 
> 
> 
>       
> 
> 
> 



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