[RFI] Wired vs Wireless Routers for RFI

Paul_group paul_group at greenrover.demon.co.uk
Sat Jan 12 12:27:49 EST 2008

Donald Kemp wrote:
> Jim,
> I do not know if the female connectors in the router; modem; or computers
> have provisions to ground the shield of the male plug. I did not ring out
> any of the conductors in the cable to the shield to see if one was also
> connected.

I just placed a picture on my site showing the connectors and the screen.


A - shows the contact on the hub

B - is the point where the connector shell bonds to the cable screen.

I'm not sure if its obvious from the picture but the screen of the cable 
is trapped between the jacket and the metal shell where it folds inside 
the cable entry.

The screen contact does not use any of the 8 contact pins.

Yes they are interchangeable with unscreened connectors - but obviously 
if you use a none screened contact its not screened :-)

> On Jan 12, 2008 11:22 AM, Jim Brown <jim at audiosystemsgroup.com> wrote:
>> Thanks, Don. To clarify -- are you saying that the female Ethernet
>> connectors built
>> into the cable modem, the router, and the computers all have shield
>> contacts?
>> Where did you buy these cables? Did you build them yourself and put
>> connectors on
>> them?

Available from just about any of our normal component suppliers, RS - 
Farnell CPC etc..

Yes you can fit them onto cable if you have the correct jaw for your 
crimping tool.

This is about the cheapest Ethernet device I could find in the workshop 
and the connector is screened, every one of the Ethernet connectors on 
the PC's hubs and routers  I have here has a screened chassis 
connector.. I'd be surprised if anything except the cheapest nastiest 
kit uses unscreened connectors these days.


73 de Paul

73 de Paul GW8IZR IO73TI

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