[arm-allstar] Obnoxious tone

[Chris Smart]

I just added a DB9 cable and a USB with ferrites to my set up and the 
wine is gone. I"m not sure which cable fixed it, but I now have the Pi, 
the RIM-Alinco device, and the radio itself nicely separated.


Next thing to try will be a USB cable with ferrites between the Pi and 
my Rigrunner DC distribution block, instead of the regular wall-wart 
that came with the Pi, to see if things get even quieter.


I'm already at the point where self noise from whichever HT I'm 
transmitting to the node with is higher than anything from the node 
itself. :)


A Yaesu FT-70DR with the inexpensive Heil HTH-Y headset mic results in 
actual lows in my audio... very nice. The Alinco passes actual bass 
frequencies.


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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