with the report and order on the horizion in the Ham I looking to
assemble a antenna to cover ham 12 across ham ten 10m band meaning it
also sweeps up CB stuff

any advice (asking hams of in antenna is good way to learn about
politic not antennas
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wrote:
with the report and order on the horizion in the Ham I looking to
assemble a antenna to cover ham 12 across ham ten 10m band meaning it
also sweeps up CB stuff

any advice (asking hams of in antenna is good way to learn about
politic not antennas


An antenna is a reactive device. At only one frequency there is no
inductive (too long) or capacitive (too short) reactance.

Acceptable bandwidth of 2.0:1 SWR is greater in full size antennas
without loading coils or capacity hats. However, no fixed antenna
will cover 12 to 10 without an adjustable matching network AT THE
FEEDPOINT. An antenna tuner at the radio end of the coax only serves
to make the radio see a happy 50 ohms but does not correct the mismatch
at the antenna.

May I suggest a trip to your local public library and look in 621
for books to learn more then I can type to you in a reasonable
amount of time.

On Sun, 29 Jan 2006 15:25:34 -0500, wrote in
:

with the report and order on the horizion in the Ham I looking to
assemble a antenna to cover ham 12 across ham ten 10m band meaning it
also sweeps up CB stuff


Depends on what kind of antenna you want. A non-resonant antenna
doesn't care what freq you feed it, but don't look for efficiency in a
small package. A good non-resonant antenna would be a discone, but
were talking a pretty good sized gizmo floating above your yard. At
least the birds would love it.

If you're thinking a 1/2-wave dipole, there are a couple tricks you
can try. A folded dipole has a much greater bandwidth than a standard
dipole. You can get the same effect with a standard dipole by using a
bandwidth compensation tank (an LC tank at the feedpoint and tuned to
the center of the desired bandwidth). It works kinda like a passive
auto-tuner over a limited range. I don't think either method will
cover 12 to 10m, but at least it's a place for an experimenter to
start. I would suggest the tank and play with the Q values.


any advice (asking hams of in antenna is good way to learn about
politic not antennas


No kidding.








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"Frank Gilliland" wrote in message
...
On Sun, 29 Jan 2006 15:25:34 -0500, wrote in
:

with the report and order on the horizion in the Ham I looking to
assemble a antenna to cover ham 12 across ham ten 10m band meaning it
also sweeps up CB stuff


Depends on what kind of antenna you want. A non-resonant antenna
doesn't care what freq you feed it, but don't look for efficiency in a
small package. A good non-resonant antenna would be a discone, but
were talking a pretty good sized gizmo floating above your yard. At
least the birds would love it.

If you're thinking a 1/2-wave dipole, there are a couple tricks you
can try. A folded dipole has a much greater bandwidth than a standard
dipole. You can get the same effect with a standard dipole by using a
bandwidth compensation tank (an LC tank at the feedpoint and tuned to
the center of the desired bandwidth). It works kinda like a passive
auto-tuner over a limited range. I don't think either method will
cover 12 to 10m, but at least it's a place for an experimenter to
start. I would suggest the tank and play with the Q values.


any advice (asking hams of in antenna is good way to learn about
politic not antennas


No kidding.


Hello, Frank

One could always go with a log-periodic array.

Or a very short, very fat vertical.

Or a Heathkit Cantenna. *Very* low noise pick-up ))



73 from Rochester, NY
Jim

"Jim Hampton" wrote...

Or a very short, very fat vertical.

Yes, you called?

:~)

Peter.