P N P wrote:

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 ?

If the "long wire" is not resonant, a balun won't do much good. What
are you doing with the coax braid at the point of connection to the
long wire?
--
73, Cecil http://www.qsl.net/w5dxp



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John,
No, I won't bother. A balun is unnecessary. Yhe
so called 'longwire balun's aren't, really, but they
seem to be a money maker for the manufacturers. Besides,
isn't a long wire antenna unbalanced to start with?
'Doc

John,
Could you convert it to a 'Windom'? Sure, or a dipole, or
continue the thing around and make a loop out of it. Lots of
possibilities depending on the area you have to work with.
The question is, will a particular length and 'shape' be of any
benefit? Beats me, just depends on what frequency(s) you want
to use it on. Nothing works well on all frequencies, and almost
anything will work well on some frequency (lot of help, huh?).
There's also no 'rule' that says you have to keep whatever
antenna
you start with. If something doesn't work as well as you would
like, try something else. There is no one 'best' antenna...
'Doc

On Mon, 9 Feb 2004 11:52:07 -0800, "P N P"
wrote:

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


I would skip the balun and just get an inexpensive antenna tuner from
MFJ. Attach your long wire to it, twist the controls for maximum
static at a particular frequency, and that's it.

Bob
k5qwg

John, you don't necessarily need a balun. Not knowing your installation, I
would most likely split the coax at the feedpoint (which, for longwires, can
be virtually anywhere), and run the shield to ground (counterpoise, etc.).
No balun needed...

- Mike KI6PR
El Rancho R.F., CA

"P N P" wrote
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

Long Wire Balun
 

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

The length is unknown at present, it runs up the trunk of a tree in the back
yard then across the roof of the house - I could convert it to a Windom as
have "length" to play with ?
"'Doc" wrote in message ...
John,
No, I won't bother. A balun is unnecessary. Yhe
so called 'longwire balun's aren't, really, but they
seem to be a money maker for the manufacturers. Besides,
isn't a long wire antenna unbalanced to start with?
'Doc

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




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"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





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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

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
.

"Edmund H. Ramm" wrote in message
...
In "CW"
writes:

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

On the contrary, it is the generally accepted definition.

You're saying that a 1/4 wave wire is 'long'?
__
Steve
KI5YG
..

No. Reread the thread.
" Stephen Cowell" wrote in message
. com...

"Edmund H. Ramm" wrote in message
...
In "CW"

writes:

That is the generally excepted definition.
You're saying that a 1/4 wave wire is 'long'?
__
Steve
KI5YG
.

I think reading lessons should be in your future. You're saying that you're
right and I'm wrong when we said the same thing?

No, I'm confirming your
statement (a longwire antenna has to be longer than one wavelength),
while at the same taking exception to what CW wrote.