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Re: [TowerTalk] Point me the way....

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Point me the way....
From: Chris Pedder <chris@g3vbl.co.uk>
Date: Fri, 19 Dec 2003 17:03:17 +0000
List-post: <mailto:towertalk@contesting.com>
At 16:03 19/12/2003, N8DE wrote:
Or use 75 ohm coax and parallel two of them for a much closer match!
Don
N8DE

Clive GM3POI wrote:
Even better still, I use parallel quarter wave transformers to match
12.5ohms to 50 ohms.
So the only addition to the system is another length (about 90ft @ 1.8mhz)
to put in parallel with the last 90ft of your 50 ohm feeder. No UNUNs,No
networks to go wrong. Just a reliable 25 ohm quarter wave transformer. 73
Clive GM3POI

According to my sums, Clive is spot on and I would do as he says! (You need the geometric, not the arithmetic mean)


Chris


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See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.

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