On Wed, 4 Aug 1999, Thomas Sailer wrote:
> Tomi Manninen OH2BNS wrote:
> >
> > On Wed, 4 Aug 1999, Hamish Moffatt wrote:
>
> > > Do you think it is a problem to operate with the squelch open always?
> > > The soundmodem seems to do a pretty good carrier detect anyway.
> >
> > As far as I can see, using squelch with soundmodem can only make things
> > worse. It _will_ make carrier detection slower and possibly also receiver
> > recovery (from tx). Both are very important factors for efficient channel
> > usage. False carrier detection is much less dangerous. CPU usage might be
> > slightly lower with squelch but I doubt you can even notice that.
>
> On the other hand, if a hardware squelch decides wrongly, the packet is
> trashed. If the software squelch (or rather carrier detect) errs,
> the packet reception is not affected.
Umm... Isn't that just another reason not to use squelch (or rather run
squelch open). Did I miss something?
> So it depends. If you have a very fast hardware squelch (preferably
> that operates on the RF power level), then use it, but I doubt that
> most FM rigs have anything but an extremely slow squelch.
But in the case of soundmodem, the carrier detection is done in software
anyway and any kind of squelch, no matter how fast, can only make the DCD
slower. Right?
--
--- Tomi Manninen / [EMAIL PROTECTED] / OH2BNS @ OH2RBI.FIN.EU ---
