I had a similar problem with the old laptop I use in the shack. I was able
to get 17T of my USB cable through a Fair Rite #31 2.4in (2631803802)
toroid and have been trouble-free ever since. I did this close to the
radio. Here's a picture:
https://sites.astro.caltech.edu/~dhale/share/usb-choke.jpg
73 de Dave N3WTK
On Sat, Aug 6, 2022 at 3:50 AM Martin Sole <hs0zed@gmail.com> wrote:
> Hi,
>
> I'm writing this for a friend. He has an Icom IC-7610 connected to a
> laptop running Win4Icom. At anything over about40 watts it doesn't take
> many FT8 transmit cycles before Win4Icom will report a connection
> error,the error log shows port closed and the author's statement in the
> alert box that appears is that this is most likely caused by RFI.
> Accordingly, we want to deploy suitable ferrite on the USB cables. My
> thinking is that 3 to 4 turns around one of the medium or large type 31
> snap on's that DX engineering sells, at each end of the USB cable, would
> be a good start.
>
> Is my thinking here sound or are there other things we should try first?
>
> Thanks
> Martin HS0ZED
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