some attenna the issue I am interestedin is Bandwidth of the anttena
 

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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some attenna the issue I am interestedin is Bandwidth of theanttena
 

some attenna the issue I am interestedin is Bandwidth of the anttena
 

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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some attenna the issue I am interestedin is Bandwidth of the anttena
 

"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

some attenna the issue I am interestedin is Bandwidth of the anttena
 

"Jim Hampton" wrote...

Or a very short, very fat vertical.

Yes, you called?

:~)

Peter.