[Antennas] WINDOM

Sat Sep 30 23:31:21 EDT 2006

Unless you're making this antenna of very fine wire, a windom should be able 
to handle the current - but make sure that the insulators are long enough to 
handle the high voltage at the ends.

The real question is:  How are you feeding the antenna so that it presents a 
good match to a modern transistorized transmitter - which only accept a 
range of impedances from about 25 to 100 ohms resistive?

If you're feeding this antenna using a single wire feeder matched with a 
Johnson Ranger with a wide range pi-network output which matches 3 to 3,000 
ohms, you'll have no problem.

So the question is what are you going to match the nominal 600 ohm impedance 
with?

Also (just to make sure) you are talking about a windom antenna which is a 
length of horizontal wire which is fed with a single wire feeder off center? 
Or are you talking about an Off Center Fed dipole - one fellow who makes 
this calls them "Carolina Windoms" and they're fed with coax and 
transformers.  The Fritzel antenna was one of these - they often can be made 
to work on many bands - but the limiting factor is the transformers - they 
have to be built large enough to withstand the voltage and current that 
accompanies 1,500 watts output.  I've also seen coax when subject to a large 
impedance mismatch fail by perforating the dielectric when running high 
power.  Coax is usually 50 to 100 ohms.

73

David N1EA

----- Original Message ----- 
From: "Greg Taylor" <we9m at decaturwb.com>
To: <antennas at mailman.qth.net>
Sent: Saturday, September 30, 2006 10:21 PM
Subject: [Antennas] WINDOM

Does anyone on the list know of a 160 meter Windom that will handle legal
limit? I have never constructed one of these but have built several other
wire antennas.

73 de WE9M Greg

we9m at arrl.net
http://users.decaturwb.com/we9m/
http://www.qsl.net/kb9kng/index.htm

"All that is necessary for the triumph of evil is that good men do nothing."
Edmund Burke Irish orator, philosopher, & politician (1729 - 1797)

______________________________________________________________
Antennas mailing list
Home: http://mailman.qth.net/mailman/listinfo/antennas
Help: http://mailman.qth.net/mmfaq.html
Post: mailto:Antennas at mailman.qth.net

-- 
No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.0.407 / Virus Database: 268.12.10/459 - Release Date: 9/29/2006