[RFI] RFI Digest, Vol 235, Issue 6

[Kenneth Goodwin]

Solve the root cause not the symptom.  RF energy in the shack (matched antenna), use decent USB cables, cheap laptop??

Sent from Nine
________________________________
From: rfi-request at contesting.com
Sent: Saturday, August 6, 2022 11:00 AM
To: rfi at contesting.com
Subject: RFI Digest, Vol 235, Issue 6

Send RFI mailing list submissions to 
rfi at contesting.com 

To subscribe or unsubscribe via the World Wide Web, visit 
http://lists.contesting.com/mailman/listinfo/rfi 
or, via email, send a message with subject or body 'help' to 
rfi-request at contesting.com 

You can reach the person managing the list at 
rfi-owner at contesting.com 

When replying, please edit your Subject line so it is more specific 
than "Re: Contents of RFI digest..." 


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 at gmail.com> 
To: rfi at contesting.com 
Subject: [RFI] USB port closing 
Message-ID: <e21e0029-2eda-a9de-0786-e80ba8528ba2 at 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 at gmail.com> 
To: "'Martin Sole'" <hs0zed at gmail.com>, <RFI at 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 at 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 at gmail.com> 
To: rfi at contesting.com 
Subject: Re: [RFI] USB port closing 
Message-ID: 
<CAMA0n1Lt0m8r2g9tY8_W+vKZ=uLYm4UxEXcZjGHbe0GWTT60Xg at 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 at 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 at contesting.com 
> http://lists.contesting.com/mailman/listinfo/rfi 
> 


------------------------------ 

Subject: Digest Footer 

_______________________________________________ 
RFI mailing list 
RFI at contesting.com 
http://lists.contesting.com/mailman/listinfo/rfi 


------------------------------ 

End of RFI Digest, Vol 235, Issue 6 
***********************************