Not on mine, Jeff - all plastic.
73, Pete N4ZR
On 1/16/2024 12:04 PM, Jeff (W4DD) wrote:
No pin is needed. There is a metal shell around the RJ45.
On Tue, Jan 16, 2024, 11:40 AM Pete Smith N4ZR <pete.n4zr@gmail.com>
wrote:
Oh Joy - another thing to check. I'm using a plain Ethernet Cat 5
patch cable from my amp to my computer. Judging by how floppy it
is, I suspect no shielding at all - but a question - if there were
a shield, which pin on the Ethernet connector would it be?
73, Pete N4ZR
On 1/16/2024 10:22 AM, Jeff (W4DD) wrote:
Pete, just another data point based on my experience with shielded Ethernet
cables. Excerpt from one of my PPT's follows. I found the shield connections
to be intermittent.
Do Not Use Shielded Ethernet Cables from the Common Internet Sites
The shield is not soldered to the metal RJ-45 shell. I measured 2-20 ohms
on a group of 5 jumper cables shell to shell. Mouser Electronics has Amphenol
Ethernet cables ($7) with the drain wire soldered to the metal RJ-45 shell at
both ends. Resistance was less than 1 ohm for each of 5 cables measured (view
the spec sheet at Mouser.com).
Jeff, W4DD
-----Original Message-----
From: RFI<rfi-bounces+w4dd09=gmail.com@contesting.com>
<mailto:rfi-bounces+w4dd09=gmail.com@contesting.com> On Behalf Of Pete Smith N4ZR
Sent: Tuesday, January 16, 2024 9:32 AM
To:N1MMLoggerPlus@groups.io; RFI List<rfi@contesting.com>
<mailto:rfi@contesting.com>
Subject: [RFI] USB Cable Shield Resistance was: Re: [N1MM+] open question about
RFI & USB
Interestingly, I just tested the shielding on a USB A to USB C cable I
have, which looked like it should be fine, with a transparent jacket over woven
shielding and a big ferrite bead - about 1 meter long, and measured 2.7 ohms -
not good. What should be consider to be the upper permissible shield
resistance?
Moving this issue to the RFI reflector now...
73, Pete N4ZR
On 1/16/2024 5:01 AM, Janez Majdic viagroups.io <http://groups.io> wrote:
Maybe also good to read:
https://www.yoctopuce.com/EN/article/usb-cables-shielding-matters-as-w
ell
Regards, Janez - S51J
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