[arm-allstar] CTCSS detect ping-pong - stumped

[Doug Crompton]

Also remember you have a good troubleshooting window in simpleuse-tune-menu
- item v shows the inputs realtime.

Doug


On Fri, Oct 26, 2018 at 11:00 PM "Robert Conklin via ARM-allstar" <
arm-allstar at hamvoip.org> wrote:

> Thank you Kevin, I did try a 1k with same results. Then I tried excersizing
> a 0 to 5k pot, same result.
>
> Rob Conklin
> N4WGY
>
> On Fri, Oct 26, 2018, 9:53 PM "Kevin Custer via ARM-allstar" <
> arm-allstar at hamvoip.org> wrote:
>
> > Robert,
> >
> > Try a 1k pull-down resistor.
> >
> > The CM1XX chipset requires a ground to become active, and you may not be
> > pulling it low enough to be stable and assert the logic change properly.
> >
> > Kevin W3KKC
> >
> >
> >
> > On 10/26/2018 10:04 PM, "Robert Conklin via ARM-allstar" wrote:
> > > Greetings all. I'm stumped on a ping-pong PTT issue when using ctcss
> > detect
> > > output from my repeater's receiver.
> > >
> > > Here's the layout:
> > > Hamvoip 1.5 code, fresh image w/latest updates.
> > > DMK URI
> > > Motorola MTR2000 repeater in base mode. Programmed for PL on input and
> > > output.
> > > The MTR's CTCSS and COS detect outputs are active high (5vdc), I use a
> > 10k
> > > resistor to pull them low when inactive.
> > > When using CTCSSFROM in usb mode, the CTCSS signal pin-pongs in fairly
> > (not
> > > perfectly) regular intervals, at about 1Hz, thus the PTT ping-pongs
> with
> > > it. If I use COS, no ping pong. Transmission coming from telemetry or
> > from
> > > links are unaffected so it appears to be a repeater issue.
> > > I scoped the COR and CTCSS signals and they appear completely identical
> > in
> > > amplitude, accept the CTCSS signal drops in and out BUT it only does
> that
> > > when it's hooked up to the URI. That's the kicker, that CTCSS signal is
> > > solid as a rock when I take it of the URI. I tried another URI with the
> > > same result. I cannot see anything in the RSS programming for the MTR
> > that
> > > would change that CTCSS pin's behavior.
> > > Would be very appreciative of any thoughts or ideas, thank you!
> > >
> > > --
> > > Robert Conklin
> > > *N4WGY <http://qrz.com/db/N4WGY>*
> > > _______________________________________________
> > >
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> > > ARM-allstar at hamvoip.org
> > > http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
> > >
> > > Visit the BBB and RPi2/3 web page - http://hamvoip.org
> > >
> >
> > _______________________________________________
> >
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> >
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> >
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