[arm-allstar] Obnoxious tone

[David McGough]

Bryan,

Several users have reported strange behavior recently with RIM adapters, 
I'm beginning to wonder if there is a pattern?

Since you're reporting this on the AllStar RX audio, not TX audio, it's 
unlikely that this is caused by an RF source.

Does the whine go away if you unplug the RIM-Alinco from the radio?  To 
get AllStar to see COS and "key," you may need to go into 
simpleusb-tune-menu, option 'J', and change the telemetry setting from 2 
(usb) to 3 (usbinvert), or vice-versa, to get AllStar to "key."  ....This 
is a temporary change for testing, of course.

Also, try leaving the RIM-Alinco attached to the radio, but turn the radio 
off. Again, you may have to adjust simpleusb-tune-menu option 'J' 
temporarily.


73, David KB4FXC



On Sat, 19 Jun 2021, "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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