You'll get that kind of reading if the ends are too close
together. If your antenna is U shaped, or V shaped,
then that is the problem. Antennas that zig and zag
around should have a low swr, as long as the ends
are as far apart as you can get them. I have a 160m
dipole on a 50x130 lot that does a lot of zigging and
zagging around off my 40ft tower. Keeping the ends
at opposite ends of the lot, I have a 1:1 at around
This isn't an ideal situation, but a 2.3:1 SWR on 75m
should be easy to match with an auto tuner, or manual
The correct way to put up a dipole (if you can) is to
keep it in a fairly straight line. But, if what you are
doing is the best you can, use a tuner to keep the rig
happy and have fun!
73, Mike K9MI
----- Original Message -----
Sent: Wednesday, February 18, 2004 22:17 PM
Subject: [TowerTalk] Dipole Problem
> I always thought a dipole was simple. First the description:
> 75 meter dipole (58.5 feet per leg) placed 4 feet above peak
of second story
> roof. Roof is 40 feet wide so ran extra wire at right angle
> rest of house (big square "U").
> Center of dipole is in center of 40 foot section using a large
> and an SO-239
> to start, balun later.
> My AEA-HF and Autek RF-1 both read resonance at 3968 KHz which
is fine BUT
> SWR is about 2.3:1, R=29 ohms.
> The only thing I can figure is the way I wrapped the wire on
> insulator: so that if
> the insulator were to break, the wires would catch each other
and not part.
> Could there be that much capacitance there to throw my reading
off that much?
> The wires are at right angles to each other. Any other
> TIA. Geoff, K6TFZ
> 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.
> TowerTalk mailing list
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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
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