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

[David McGough]

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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