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Re: [TowerTalk] Matching a Delta Loop

To: "Phil Clements" <philc@texascellnet.com>,<towertalk@contesting.com>
Subject: Re: [TowerTalk] Matching a Delta Loop
From: "Andrew Roos" <Andrew.Roos@poynting.co.za>
Date: Thu, 19 Oct 2006 07:46:18 +0200
List-post: <mailto:towertalk@contesting.com>
A 1/4 wave section of 72 Ohm coax will give you 66 Ohms, for an SWR of
1.3. 

Andrew ZS6AAA

-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Phil Clements
Sent: 18 October 2006 10:03 PM
To: towertalk@contesting.com
Subject: [TowerTalk] Matching a Delta Loop

I hastily threw together a 30 meter Delta Loop this summer in order to
get
KH8SI in the log for a new one on CW. Using the formula, the resonant
point
came out 10.105 mhz (great, first try!) but the feed-point impedance is
79
ohms. 

What is a good method of matching this antenna to 50 ohm coax? I don't
want
to use ferrites. I'm using a line-flattener in the shack now, but I
robbed
it from another project, and I need to return it.

This antenna is a real "keeper;" I was able to bust the pile-up on 2nd
call.
The apex is a 50 feet on an 80 foot Rohn 25 tower.

Thanks in advance for any suggestions.

(((73)))
Phil Clements, K5PC




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