Antenna tuner
 

Instead of buying an antenna tuner, is it possible to build one myself.
Nothing fancy, but a rotary switch and some ?capacitors?. Thanks for the
advice.

Matthew


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Matthew&Wendy wrote:
Instead of buying an antenna tuner, is it possible to build one myself.
Nothing fancy, but a rotary switch and some ?capacitors?. Thanks for the
advice.

I prefer pi-net tuners - two variable caps to ground and a variable
coil in series in the middle. Easy to build and is a low-pass filter
to boot.
--
73, Cecil, W5DXP



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OK. I am brand new to circuit design. Is there a diagram or picture I could
find to build it. I can solder and get parts, I just don't know the lingo
yet.

"Cecil Moore" wrote in message
...
Matthew&Wendy wrote:
Instead of buying an antenna tuner, is it possible to build one myself.
Nothing fancy, but a rotary switch and some ?capacitors?. Thanks for the
advice.

I prefer pi-net tuners - two variable caps to ground and a variable
coil in series in the middle. Easy to build and is a low-pass filter
to boot.
--
73, Cecil, W5DXP



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Matthew&Wendy wrote:
OK. I am brand new to circuit design. Is there a diagram or picture I could
find to build it. I can solder and get parts, I just don't know the lingo
yet.

There are some antenna tuners described in the ARRL Antenna Book.
--
73, Cecil, W5DXP



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"Cecil Moore" wrote in message
...
Matthew&Wendy wrote:
Instead of buying an antenna tuner, is it possible to build one myself.
Nothing fancy, but a rotary switch and some ?capacitors?. Thanks for the
advice.

I prefer pi-net tuners - two variable caps to ground and a variable
coil in series in the middle. Easy to build and is a low-pass filter
to boot.
--
73, Cecil, W5DXP

Hi Cecil
Hi "Matthew&Wendy"
I prefer resonant antennas and transmission lines that match them.
You just can't beat a resonant antenna for radiation.
Tuners squander AT BEST 1 or 2 db.
At WORST (as Cecil has posted here regarding "shootouts") 10 db.
So build your antenna resonant, match it, and don't bother with a tuner.
If impedance transformation is necessary, use a transformer;
That's why they're called transformers.
That's what they're for.
Just my 2 cents.
73
H.
NQ5H

PS
Wire antennas are CHEAP.

H. Adam Stevens, NQ5H wrote:
I prefer resonant antennas and transmission lines that match them.

I prefer non-resonant antennas and transmission lines that resonant them. :-)

You just can't beat a resonant antenna for radiation.

Maybe not, but you can equal them. A tuned transmission line resonates
the antenna system.

Tuners squander AT BEST 1 or 2 db.

That's why I don't use a conventional tuner.

So build your antenna resonant, match it, and don't bother with a tuner.

Or build your antenna non-resonant and match it with a series section
transformer.

If impedance transformation is necessary, use a transformer;

IF impedance transformation is necessary, use a transmission line
as the transformer. :-)
--
73, Cecil, http://www.qsl.net/w5dxp



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On Sun, 4 Apr 2004 22:12:24 -0500, "H. Adam Stevens, NQ5H"
wrote:

You just can't beat a resonant antenna for radiation.

Eh? You mean a 1¼-wave (non-resonate) dipole radiates less than a
¼-wave resonate dipole?

Strange in that a 1¼-wave dipole has 3 dBd gain.

Danny, K6MHE

"Dan Richardson @mendolink.com" ChangeThisToCallSign wrote in message
...
On Sun, 4 Apr 2004 22:12:24 -0500, "H. Adam Stevens, NQ5H"
wrote:

You just can't beat a resonant antenna for radiation.

Eh? You mean a 1¼-wave (non-resonate) dipole radiates less than a
¼-wave resonate dipole?

Strange in that a 1¼-wave dipole has 3 dBd gain.

Danny, K6MHE

Danny

Do antennas have gain or do they have directivity?

Jerry

"Bill Turner" wrote in message
...
On Sun, 4 Apr 2004 22:12:24 -0500, "H. Adam Stevens, NQ5H"
wrote:

Tuners squander AT BEST 1 or 2 db.

__________________________________________________ _______

Nonsense. At 1500 watts, a tuner which "squandered" 1 db would be
dissipating about 300 watts and would soon be a smoking mess.

2 db I don't even want to think about.


--
Bill, W6WRT
QSLs via LoTW

Bill

This is just something to think about. I would have thought that
"squandered" power wouldnt necessarily be "dissipated".

Jerry

sigh
"Cecil Moore" wrote in message
...
H. Adam Stevens, NQ5H wrote:
I prefer resonant antennas and transmission lines that match them.

I prefer non-resonant antennas and transmission lines that resonant them.
:-)

It's "resonate", Cecil, and the antenna still won't be resonant.


You just can't beat a resonant antenna for radiation.

Maybe not, but you can equal them. A tuned transmission line resonates
the antenna system.

When you get a lossless line. And the antenna still isn't resonant.


Tuners squander AT BEST 1 or 2 db.

That's why I don't use a conventional tuner.

So build your antenna resonant, match it, and don't bother with a tuner.

Or build your antenna non-resonant and match it with a series section
transformer.

If impedance transformation is necessary, use a transformer;

IF impedance transformation is necessary, use a transmission line
as the transformer. :-)

Not the least lossy approach.
Matched impedance = max power transfer.

--
73, Cecil, http://www.qsl.net/w5dxp

73
H.