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Re: [RFI] Internet Modem / Router Cable Length and RFI

To: rfi@contesting.com
Subject: Re: [RFI] Internet Modem / Router Cable Length and RFI
From: Jim Brown <jim@audiosystemsgroup.com>
Reply-to: jim@audiosystemsgroup.com
Date: Mon, 01 Jun 2015 20:48:44 -0700
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
On Mon,6/1/2015 8:10 PM, KD7JYK DM09 wrote:
"I would worry more about the long cat5 cable, both for rfi and
susceptibility to your rf getting into it."

Anyone running CAT5 through EMT?  Looking at the possibility of a 30-40' run
under the house and thinking of running it through a grounded pipe from the
router to the computer with only a few inches exposed at each end.

I love EMT for shielding. BUT -- to provide shielding, the EMT, like any cable shield, must be bonded to the shielding enclosure (or ground plane) of the equipment at both ends. Simply grounding the EMT is insufficient.

Another potential issue -- engineers working in computer networking advise many practices that we use for analog systems should not be used for unshielded CAT5/6/7 cables. We should not, for example, bundle them, because it creates small discontinuities in the balance of the pairs, and of the coupling between pairs. Putting these cables in EMT could have the same effect. The result is increased error rates, thus slower data rates.

73, Jim K9YC
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