[arm-allstar] Obnoxious tone

[Chris Smart]

I get that wine if I move the USB cable around. Mostly, I find a spot 
where it doesn't make that noise and try to not touch it.

I have a DB9 cable and a thicker USB cable with ferrite on order. They 
should arrive Monday. I'll let you know if they improve things.




On 2021-06-19 4:48 p.m., "Bryan Johnson via ARM-allstar" wrote:
> I have a server with the latest hamvoip version (pre-release from a 
> couple weeks ago) installed. I'm using simpleusb and a RIM-Alinco tied 
> to a newer DR-135. I get a very obnoxious whine (around a 1000khz or 
> so) on received audio (audio coming from the allstar server, that is) 
> from the Alinco. I've got ferrite beads on the power wires (Alinco and 
> usb cable feeding the pi), ethernet cable and usb cable from the pi to 
> the RIM-Alinco. I tried another power supply for the pi (3b+). I even 
> tried a 12 volt to usb converter (off the same 12 vdc supply powering 
> the Alinco) to power the pi. Tried disconnecting the ethernet cable to 
> eliminate suspects. Still can't figure out where the whine is coming 
> from, but I suspect the RIM-Alinco. Anyone else run across this issue? 
> And suggestions to get rid of the whine? Wondering if I could use a 
> straight thru DB9 cable to move the RIM-Alinco away from the back of 
> the DR-135 to see if that helps (assuming some sort of RF feedback 
> from the Alinco). It has me stumped.
>
> Thanks,
>
> Bryan - K6RBJ
>
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