[TowerTalk] Cob Web Antenna

[Joe Subich, W4TV]

 > Has anyone actually modeled a Cob Web antenna?

It's effective a "halo" or "squalo" on each band.  It will generally be
down a dB or so compared to a dipole but without the significant nulls
off the end like a dipole.

Feed point impedance will be in the 12 Ohm range (again, like the halo)
so the Cobbweb uses either a 1:4 (not 4:1) "balun" or the user can use
folded dipoles for the elements - although that may have a problem with
shorted stubs (the 20 meter element) on 10 meters.

 > I was wondering how it compares to a dipole.

In practice since the Cobwebb installs on a single mast, one may be
able to get it higher and in the clear compared to a wire dipole.
I've done something similar for several years with an N6BT Q51 (a
band switched center loaded dipole for 20-10 meters).

73,

    ... Joe, W4TV


On 10/28/2017 12:25 PM, Gary wrote:
> 
> Has anyone actually modeled a Cob Web antenna?
> 
> Most of the stuff I find on the web - says - I got a good match it therefore it is a great antenna.
> 
> I was wondering how it compares to a dipole.
> 
> Thanks and 73,
> Gary kk0sd
> 
> ________________________________
> From: TowerTalk <towertalk-bounces at contesting.com> on behalf of W0MU Mike Fatchett <w0mu at w0mu.com>
> Sent: Saturday, October 28, 2017 11:13 AM
> To: towertalk at contesting.com
> Subject: [TowerTalk] Turn 80m dipole inv v into something for 30m
> 
> I have an 80 inverted V that I would like to transform to something
> useful for 30m.
> 
> It is fed with RG213 and a balun at the feedpoint.
> 
> It is close to 3/4 wavelengths on each side which might be ok but the
> match is going to be bad.
> 
> It might just be easier to toss up an 1/2 wave V and not worry about the
> 80m.
> 
> Suggestions or comments welcome!
> 
> W0MU
> 
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