Reflector Length??
 

I'm diddling with the design of a homebrewed 20M hexagonal wire beam a
la the Traffie Hexbeam. I have the driven element resonated at
14.150=B1 in the modeler. Now I have to add the reflector to the model.
The question is how much longer should the refelector be vs. the
overall length of the driven element in terms of percenatge/scale
factor. I'm much more interested in F/B performance than I am in
forward gain. Does anybody who has been there have suggestions for a
starting point??=20

Tnx, w3rv

pfriedmanNoSpam wrote:
wrote in message
oups.com...
I'm diddling with the design of a homebrewed 20M hexagonal wire beam
a
la the Traffie Hexbeam. I have the driven element resonated at
14.150=B1 in the modeler. Now I have to add the reflector to the
model.
The question is how much longer should the refelector be vs. the
overall length of the driven element in terms of percenatge/scale
factor. I'm much more interested in F/B performance than I am in
forward gain. Does anybody who has been there have suggestions for a
starting point??

Tnx, w3rv


You might want to check out the Files section the hex-beam Yahoo
group.
There are several files there with detailed specs on home brewed
mono- and
multi-band hexbeams.

Thanks for the tip Paul, I'll dig into it.=20
=20
Paul AB0SI

w3rv

On 2 Feb 2005 22:59:05 -0800, wrote:
Does anybody who has been there have suggestions for a
starting point?

Hi Kelly,

5% larger. However, its presence will change the resonance of the
driven element and you will have to approach the solution iteratively.

73's
Richard Clark, KB7QHC

Richard Clark wrote:
On 2 Feb 2005 22:59:05 -0800, wrote:
Does anybody who has been there have suggestions for a
starting point?

Hi Kelly,

5% larger.

Thanks Richard. I very vaguely remember hearing that somewhere before
but I needed to confirm it.


However, its presence will change the resonance of the
driven element and you will have to approach the solution
iteratively.

.. . "it only takes time" . . sigh . . .


73's
Richard Clark, KB7QHC


w3rv

The reflector length should be a little bit longer than 1/2-wavelength.

And that's all there is to it.

Reg Edwards wrote:
The reflector length should be a little bit longer than
1/2-wavelength.

And that's all there is to it.

Well OK Reg but . . but . . but . . Ah, never mind . .

The reflector length should be a little bit longer than
1/2-wavelength.

And that's all there is to it.

Well OK Reg but . . but . . but . . Ah, never mind . .

Brian, you've got me worried. Have I missed anything out?

Reg Edwards wrote:
The reflector length should be a little bit longer than
1/2-wavelength.

And that's all there is to it.

Well OK Reg but . . but . . but . . Ah, never mind . .

Brian, you've got me worried. Have I missed anything out?

No, no, it was me again but I'm better now . . thanks for your concern.