[arm-allstar] CW timing question

[David McGough]

Hi Brett,

No, I wasn't implying anything about Mike's ID'er mods or usage. Proper 
repeater/radio operation is the individual Trustee's responsibility.

My comments were just a reminder for anyone not aware of the FCC regs.  
And, the reasoning why a 20WPM limit was defined in the software.
Previously, I've occasionally heard non-AllStar CW ID'ers running much
faster than 20WPM on various repeaters here and there.

After briefly looking at the software this morning, I don't think the
actual algorithm is buggy?? I think the problem is likely an artifact of
the relatively course granularity of the system timing method currently
used.


73, David KB4FXC

On Sat, 30 Apr 2016, Brett Friermood via arm-allstar wrote:

> I don't think you're necessarily implying that it is, but I would say
> Mike's modification is not illegal since the actual transmitted speed is
> exactly 20 WPM, regardless of what the software thinks it's doing.
> 
> Brett KQ9N
> On Apr 30, 2016 12:09 AM, "David McGough via arm-allstar" <
> arm-allstar at hamvoip.org> wrote:
> 
> >
> > Interesting, I'm not sure what that change impacts, I'll take a casual
> > look at the related code.
> >
> > BTW, it should be noted that the FCC requires that during automatic
> > operation, the max allowed CW speed is 20 WPM, hence the software
> > limits. See 97.119(b)(1):
> >
> > https://www.law.cornell.edu/cfr/text/47/97.119
> >
> > 73, David KB4FXC
> >
> >
> > On Fri, 29 Apr 2016, Mike - W5JR via arm-allstar wrote:
> >
> > > If you slow it down to ~15 wpm, it sounds pretty good. At 18-20, it's
> > unbearable for me to listen to. I've found that changing the source to
> > raise the hardcoded limit above 20 and recompiling results in excellent
> > 20 wpm Morse. Even messages at higher speeds sound great.
> > >
> > > tnx
> > > Mike / W5JR
> > > Alpharetta GA
> > >
> > > > On Apr 29, 2016, at 2:06 PM, David McGough via arm-allstar <
> > arm-allstar at hamvoip.org> wrote:
> > > >
> > > >
> > > > Hi Tom,
> > > >
> > > > I've never found the software generated CW to be a "precision" format.
> > > > Depending of the hardware combo it can be slow, fast or nervous! It was
> > > > plain Schizo on one of my old ACID boxes from yesteryear!  LOL ....On
> > > > RPi2/RPi3/BBB hardware, it is typically fairly well behaved and I
> > believe
> > > > adequate to satisfy the ID requirements. The timing is a compiled
> > > > parameter, requiring a re-compile to adjust.
> > > >
> > > > Personally, I recommend just using a pre-recorded CW file for
> > high-quality
> > > > results. That's really easy to do, using commands like:
> > > >
> > > > echo "DE KB4FXC RPT" | tomorse -c 24 -s 20 > kb4fxc-rpt.wav
> > > > sox kb4fxc-rpt.wav -c 1 -r 8000 -v 0.25  kb4fxc-rpt-8kpcm.wav resample
> > -ql
> > > >
> > > > Unfortunately, the tomorse program isn't installed in our current ARM
> > > > codebase (perhaps in the next release?).  The source code is very small
> > > > and available here:
> > > >
> > > > https://github.com/mathuin/tomorse/blob/master/tomorse.c
> > > >
> > > >
> > > > 73, David KB4FXC
> > > >
> > > >
> > > >> On Fri, 29 Apr 2016, Tom Whiteside via arm-allstar wrote:
> > > >>
> > > >>
> > > >> This is a nit but I've gotten a couple of comments from CW
> > aficionados that
> > > >> the CW "DAH" timing is about 2.5:1 versus the preferred 3:1.   I may
> > just
> > > >> replace the CW ID with a recorded file but wondered if this was
> > something
> > > >> tweakable?
> > > >>
> > > >> Tom N5TW
> > > >>
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> > > >>
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> > > >
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> > > >
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> > >
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> > >
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> > >
> >
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> >
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> >
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> >
>