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Re: [RFI] NOISE GADGETS

To: "RFI List" <rfi@contesting.com>
Subject: Re: [RFI] NOISE GADGETS
From: "Jim Brown" <jim@audiosystemsgroup.com>
Reply-to: Jim Brown <jim@audiosystemsgroup.com>
Date: Tue, 09 Nov 2004 18:27:16 -0600
List-post: <mailto:rfi@contesting.com>
On Tue, 9 Nov 2004 16:10:38 -0700, Howard Lester wrote:

>Thank you!
>
>One 'quick' question: just how beefy do the speaker cables need to be to get
>good, solid bass? (I will go to the site to read the articles.) I am not yet
>aware of, say, 14 gauge twisted pair wire - shame on me, I guess.

West Penn, Gepco, and Belden all make stranded twisted pair cable in the #12 - 
#14 
gauge range. You can also "roll your own" out of stranded THHN from Home Depot 
by 
sticking it in a twist drill.  And you can "double up" on pairs of 
instrumentation cable. 

>I have known for a long time about twisted pair helping to reject RFI. Tell
>that to the homebuilders; they seem to refuse to use it for telephone
>wiring, even though it is allegedly "code." 

Don't know about the "code" part, but CAT5 and similar cables make EXCELLENT 
telephone wiring.  For one thing, they have very low capacitance, so they will 
help a bit 
with data transmission. 

>I had a ham friend who offered
>to do the wiring of my new home with correct telephone cable. Even though
>she worked for the phone company, my builder refused to allow her on the
>premises. If I wanted twisted pair, I would have had to pay a premium. I
>said screw it -- it's only my house, and I'm the only ham around.  No one
>around (also with 'bad' wiring) has complained about my 100 watt station.

One of the last instances of RFI that I'm chasing with my KW station (and 
antennas quite 
close to the house) is into my wife's telephone. I've got a bunch of ferrites 
on the wiring, 
but it's still getting in. I'm starting to wonder if maybe it isn't rectifying 
in some of the 
ancient telco termination gear in my basement. I haven't shifted all my telco 
stuff to 
CAT5 yet, but I probably should. 

Jim


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