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

[Robert Conklin]

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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> >
>
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