[arm-allstar] Obnoxious tone

[John Simmons]

I've been following this thread even though I haven't had this problem. 
Please visit:
http://www.k9yc.com/publish.htm
There a lots of articles about hum, noise buzz, etc between computers 
and ham radios. Jim stresses BONDING every individual module in a 
station to each other in addition to each item being bonded to a single 
point ground. If you read his papers, unwanted noise is caused by a 
difference in potential between each part of the station. Also, he says 
that RS232 interfaces must use the shield of the connection instead of 
the RS232 'ground' between devices. So, USB cables need to have a heavy 
bonding connection between different modules. Audio cables are also a 
source of issues and you should make your own using high-quality 
connectors instead of buying ready-made cables for cheap. YMMV

-de John NI0K

"Chris Smart via ARM-allstar" wrote on 6/21/2021 4:35 PM:
> 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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>>
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