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

David McGough kb4fxc at inttek.net
Sun Jul 12 16:00:53 EDT 2020


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
> _______________________________________________
> 
> ARM-allstar mailing list
> ARM-allstar at hamvoip.org
> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar
> 
> Visit the BBB and RPi2/3/4 web page - http://hamvoip.org
> 



More information about the ARM-allstar mailing list