A long wire balun or should we say unun is a great help for converting the
high impedance of a very long wire compared with frequency to an impedance
that is much closer to 50 ohms....

Check out.

http://dxantennas.com


"P N P" wrote in message
...
Could someone direct me to a site that would show me how to build a balun
for my long wire antenna to allow me the use of 50 ohm cable down to the
receiver ?
T.I.A.
John




---
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.580 / Virus Database: 367 - Release Date: 6/02/2004

"Whoopydoo"
A long wire balun or should we say unun is a great help for converting the
high impedance of a very long wire compared with frequency to an impedance
that is much closer to 50 ohms....

========================

Only half right.

If the input impedance of a long wire is LESS THAN 50 ohms then a unun makes
it worse.
----
Reg

"Reg Edwards" wrote in message
...
"Whoopydoo"
A long wire balun or should we say unun is a great help for converting
the
high impedance of a very long wire compared with frequency to an
impedance
that is much closer to 50 ohms....

========================

Only half right.

If the input impedance of a long wire is LESS THAN 50 ohms then a unun
makes
it worse.
----
Reg


If the input impedance of the wire is less than 50 ohms then either
1) it is not a long wire, it is a short wire,or
2) it is in intimate contact with the ground or counterpoise it is being
worked against;
if ground then it is a buried radial; if counterpoise then it's half a
transmission line.

The e-mail is fake. A real one is on QRZ.
KC5UES





-----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
http://www.newsfeeds.com - The #1 Newsgroup Service in the World!
-----== Over 100,000 Newsgroups - 19 Different Servers! =-----

Wrong!

If a long wire antenna, regardless of Zo, is about 1/4 wavelengths long it
will have an input impedance less than 50 ohms.

A conventional balun will bring it down to much less.

And a conventional balun will not work the other way round.
---
Reg

"Reg Edwards" wrote in message
...
Wrong!

If a long wire antenna, regardless of Zo, is about 1/4 wavelengths long it
will have an input impedance less than 50 ohms.

For me, it has to be over a wavelength
before I'll call it 'long' wire... 1/4 wave is
*definitely* not a long wire, by any stretch
of the imagination.
__
Steve
KI5YG
..

That is the generally excepted definition.

" Stephen Cowell" wrote in message
. com...

For me, it has to be over a wavelength
before I'll call it 'long' wire... 1/4 wave is
*definitely* not a long wire, by any stretch
of the imagination.
__
Steve
KI5YG
.

Reg, G4FGQ wrote:
"If the input impedance is LESS THAN 50 ohms then an unun makes it
worse"

A transformer can step down as well as step up. Early crystal sets
stepped down antenna impedance to the low impedance of the rectifier
using a continuously variable autoformer (a sliding contact on a coil).
Position was adjusted for best results.

Best regards, Richard Harrison, KB5WZI