[arm-allstar] USB Cables With the Most Shielding?

[Scott Zimmerman]

I have seen/heard tale of this in the past, but just like the OP (Chris) said, I haven't had anyone be able to "pin it down" 
to any particular cause.

The USB cable supplied with the RIMs is admittedly cheap. Since I have no idea how each person would set up their station, I 
offer the supplied cable FREE for initial setup and testing purposes. (I.E. get it on the air NOW) My thoughts were that most 
folks would order a replacement cable (USB-A to Mini-USB) of desired length and quality and thus no longer use the FREE cable 
I supply. [disposable] ;)

In the first report I had of "noise issues", the fellow was using a PL-259 to BNC adapter with a rubber duck directly on the 
rear of the radio running HIGH power. *THAT* was an easy case of RF ingress. ;)

Beyond that, I have heard of folks getting whine on both the RX and TX sides of the radio with no clear explanation nor 
resolve. (Especially since the reported RX noise was emanating from the radio's speaker.)

I have been unable to reproduce these anomalies here on the test bench. (with a known good antenna setup more than 50' away 
from the transceiver) It would seem as though some 100pf RF bypass caps sprinkled here and there would resolve it, however, 
I'm not ENTIRELY sure it's RF related; as in this case where the OP says it's clock noise ingress.

I'm more than willing to work with anyone that is having and is able to consistently reproduce the issues. It would be 
ESPECIALLY helpful if that person was technically inclined and could 'tack on' a few bypass caps for testing.

As a side note: I started getting these reports (minus the first one) about 2 years ago. There was no board layout change on 
my end. I'm not sure if Alinco made some changes on their end. (possibly eliminating Accessory connector filtering to save $$$)

Scott

Scott Zimmerman
Amateur Radio Call N3XCC
474 Barnett Road
Boswell, PA 15531

On 6/15/2021 9:31 AM, "Kevin Custer via ARM-allstar" wrote:
> Chris,
> 
> This particular radio interface could have a bad solder joint on the USB connector that's creating the issue.  It may not be 
> the cable, and is why it's intermittent.  I suggest you contact Scott Zimmerman for further assistance.
> 
> Kevin W3KKC
> 
> 
> 
> On 6/15/2021 9:25 AM, "Chris Smart via ARM-allstar" wrote:
>> I'm using the wall-wart I bought with a Pi 4.
>>
>> I have a ferrite choak on its cable right at the Wall-wart end, and I am not hearing 120 Hz on my audio.
>>
>> Now it's just the 1,046 Hz I'm sortig out. right now it's absent, as long as I don't move anything on the desk. :)
> 
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