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Re: [RFI] Ethernet RFI UPDATE

To: "Rfi" <rfi@contesting.com>
Subject: Re: [RFI] Ethernet RFI UPDATE
From: "Jim Brown" <jim@audiosystemsgroup.com>
Date: Sat, 30 Jun 2007 22:01:33 -0700
List-post: <mailto:rfi@contesting.com>
On Sat, 30 Jun 2007 12:53:11 -0400, WA3GIN wrote:

>I don't know if this next change has created was worth doing or 
not but I took the CAT5 twisted pairs of telco wire that unused in 
the 6 pair trunk line running between the barn and house (1,000ft) 
and terminated them to ground at both ends of the line.  My 
thinking was that if these pairs were  not terminated they might 
act as receive wires and re-radiate RF into the active circuit 
pair. I know this is a stretch considering the cable is shielded 
and buried.  It doesn't appear to have hurt performance of the 
Ethernet circuit.

REPEAT AFTER ME: THE EARTH IS NOT A SINK INTO WHICH HUM, BUZZ, AND 
RFI IS POURED. GROUNDING THINGS IS ALMOST NEVER A CURE FOR ANY OF 
THESE PROBLEMS, AND IS OFTEN A CAUSE OF THEM.

THE EARTH IS NOT A SINK INTO WHICH HUM, BUZZ, AND RFI IS POURED. 
GROUNDING THINGS IS ALMOST NEVER A CURE FOR ANY OF THESE PROBLEMS, 
AND IS OFTEN A CAUSE OF THEM.

THE EARTH IS NOT A SINK INTO WHICH HUM, BUZZ, AND RFI IS POURED. 
GROUNDING THINGS IS ALMOST NEVER A CURE FOR ANY OF THESE PROBLEMS, 
AND IS OFTEN A CAUSE OF THEM.

THE EARTH IS NOT A SINK INTO WHICH HUM, BUZZ, AND RFI IS POURED. 
GROUNDING THINGS IS ALMOST NEVER A CURE FOR ANY OF THESE PROBLEMS, 
AND IS OFTEN A CAUSE OF THEM.

THE EARTH IS NOT A SINK INTO WHICH HUM, BUZZ, AND RFI IS POURED. 
GROUNDING THINGS IS ALMOST NEVER A CURE FOR ANY OF THESE PROBLEMS, 
AND IS OFTEN A CAUSE OF THEM.

THE EARTH IS NOT A SINK INTO WHICH HUM, BUZZ, AND RFI IS POURED. 
GROUNDING THINGS IS ALMOST NEVER A CURE FOR ANY OF THESE PROBLEMS, 
AND IS OFTEN A CAUSE OF THEM.

73,

Jim K9YC







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