Solve the root cause not the symptom. RF energy in the shack (matched
antenna), use decent USB cables, cheap laptop??
Sent from Nine
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From: rfi-request@contesting.com
Sent: Saturday, August 6, 2022 11:00 AM
To: rfi@contesting.com
Subject: RFI Digest, Vol 235, Issue 6
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Today's Topics:
1. USB port closing (Martin Sole)
2. Re: USB port closing (Joe)
3. Re: USB port closing (David Hale)
----------------------------------------------------------------------
Message: 1
Date: Sat, 6 Aug 2022 13:50:22 +0300
From: Martin Sole <hs0zed@gmail.com>
To: rfi@contesting.com
Subject: [RFI] USB port closing
Message-ID: <e21e0029-2eda-a9de-0786-e80ba8528ba2@gmail.com>
Content-Type: text/plain; charset=UTF-8; format=flowed
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
------------------------------
Message: 2
Date: Sat, 6 Aug 2022 07:15:11 -0700
From: Joe <w7rkn.7@gmail.com>
To: "'Martin Sole'" <hs0zed@gmail.com>, <RFI@contesting.com>
Subject: Re: [RFI] USB port closing
Message-ID: <00b601d8a99e$f11dd260$d3597720$@gmail.com>
Content-Type: text/plain; charset="us-ascii"
Win4L (???) Sounds more like an HP Printer driver. Please let us know the
correct Windows version. Thanks!
Joe - W7RKN
-----Original Message-----
From: RFI [mailto:rfi-bounces+w7rkn.7=gmail.com@contesting.com] On Behalf Of
Martin Sole
Subject: [RFI] USB port closing
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
------------------------------
Message: 3
Date: Sat, 6 Aug 2022 08:01:04 -0700
From: David Hale <astronomerdave@gmail.com>
To: rfi@contesting.com
Subject: Re: [RFI] USB port closing
Message-ID:
<CAMA0n1Lt0m8r2g9tY8_W+vKZ=uLYm4UxEXcZjGHbe0GWTT60Xg@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
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
> _______________________________________________
> RFI mailing list
> RFI@contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi
>
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