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Re: [RFI] U-Verse problem update

To: Martin Ewing <martin.s.ewing@gmail.com>
Subject: Re: [RFI] U-Verse problem update
From: Donald Hill <aa5au@aa5au.com>
Date: Mon, 21 Feb 2011 08:55:14 -0800 (PST)
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
My first thought was to replace all the RG59 with quad shield since I have that 
available to me.  But since the CAT6e worked, I'll stick with it.  Not knowing 
anything about how the data is sent to/from the modem to the cable boxes, I 
wonder if using CAT5/6 is better since it's full duplex.  It seems data run 
coax would be half duplex.  Or does the cable box not need to send much data 
back to the modem?  Just don't know.


From: Martin Ewing <martin.s.ewing@gmail.com>
To: Donald Hill <aa5au@aa5au.com>
Cc: RFI <RFI@contesting.com>
Sent: Mon, February 21, 2011 9:22:22 AM
Subject: Re: [RFI] U-Verse problem update


If you've really been using RG-59, that might explain the problem.  The 
now seems to be RG-6 "triple" or "quad" shielded.  Older, cheaper coax is much 
less well shielded and permits both ingress and "outgress" of signals.  (Old 
connectors are weak points, too.) There's no reason Cat-5/6 ought to be better 
than well shielded coax*.  Of course if it works for you, that's great.

73 Martin AA6E

* That's if the equipment is well designed and handles common mode currents 
(carried on the outside of the coax) correctly.

On Mon, Feb 21, 2011 at 9:35 AM, Donald Hill <aa5au@aa5au.com> wrote:

Just an update on my U-verse RFI problem.  After it was first installed using
>the existing RG-59 home runs to each box, running 100 watts on 15, 40 and 80
>meters would lock up the boxes connected to coax.  I was able to help the
>situation by grounding the main splitter but could not run over 300 watts.
>Saturday I ran CAT6e to the master bedroom through the attic from the modem in
>the radio room.   Afterwards,  I ran 700 watts making 300 contacts in the ARRL
>DX CW contest on 10, 15, 20, 40 and 80 meters with no problems.  After I
>disconnected the RG59 to the master bedroom from main splitter, I installed a 
>ohm termination on the splitter.  The 3-port splitter still feeds the kitchen
>and living room.  Previously when testing, I noticed the boxes  in the kitchen
>and living room lose the LINK light and would require a power-cycle in order to
>start working again after transmitting high power.  After eliminating the RG59
>run to the master bedroom, the other two boxes never lost LINK although I did
>not check to see if the screens blocked up or not.  I still plan on running
>CAT6e to the kitchen and master living room but RF must have been getting into
>the coax run to the master bedroom which incidentally was the shortest coax run
>(the splitter is outside on the other side of the master bedroom).  I am happy
>that I can operate without worrying about RFI to the TVs, Internet or Phone. 
>Actually never had a problem with the Internet or incoming U-verse signal. 
>Problem was always in house.
>73, Don AA5AU
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