[arm-allstar] RX Audio only heard when Flashing Red LED is in ON State

[Louis Corradi]

Lou, W2LPC here, just wanting to put in my 2¢. It sounds to me like you may have either an over voltage/transient or your COR voltage in your controller is not stable. Just a thought. Have you checked ALL your grounds, Pi pwr sup? Good luck, hope you find your bug.

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________________________________
From: ARM-allstar <arm-allstar-bounces at hamvoip.org> on behalf of "David McGough via ARM-allstar" <arm-allstar at hamvoip.org>
Sent: Sunday, July 12, 2020 4:00:53 PM
To: "Joshua Hatton via ARM-allstar" <arm-allstar at hamvoip.org>
Cc: David McGough <kb4fxc at inttek.net>
Subject: Re: [arm-allstar] RX Audio only heard when Flashing Red LED is in ON State


Does the RED TX LED behave normally (meaning "on" all the time when TX is
asserted, "off" when TX not asserted), when unplugged from the controller?

If is does, I expect the CAT250 has an issue with its COR pin not
"floating" high and requiring active pull-down to enable.


73, David KB4FXC



On Sun, 12 Jul 2020, "Joshua Hatton via ARM-allstar" wrote:

> I am attempting to interface a Pi w/ Allstar to a CAT250 Controller.
> I am running into an issue I've never experienced before.
>
> I appear to have success, in the aspect of "operation"... I am able to
> send commands to HamVoIP over the controller audio, and able to hear
> them, however, the audio received from the Pi/USB Interface is only
> heard when the Flashing Red LED of the Interface is in the ON state
> (It's not a steady light).  Very odd. There is a measured voltage on
> that line as well, as the Red LED maintains a slight dim glow.
> Thinking something was wrong with my Masters Comm. RA35 Interface, I
> dug out an old URI Interface... It's doing the same thing exactly.
> Something is definitely circumstantial with the controller.  Perhaps I
> need to do a Pull-up/Pull-Down on **both** the PTT and COR Lines under
> the circumstances?
> That is pulling one to Pi USB Voltage and the other to controller PSU
> voltage?  Just thinking out loud on that.  Wiring made as written
> below.
>
> Pi USB Int.  < ---- >  CAT250 Link Port
> ---------------------------------------------------------------
>      PTT   < ---------------- >   COR
>      COR  < ---------------- >   PTT
>      RXA   < ----------------- >  TXA
>      TXA   < ----------------- >  RXA
>      GND  < ----------------- >  GND
>
> THanks for any guidance.
> Josh W4ZZK
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