Topband: Are stacked verticals feasible?

[Charlie Cunningham]

I don't think so, Tim. If I understand Carl, he's describing two ground
planes - one above the other - and the pattern/gain would depend on the
phasing between the two feeds and the vertical separation between them.

Regards,
Charlie, K4OTV

-----Original Message-----
From: Topband [mailto:topband-bounces at contesting.com] On Behalf Of Shoppa,
Tim
Sent: Thursday, September 05, 2013 10:30 PM
To: Carl; topband at contesting.com
Subject: Re: Topband: Are stacked verticals feasible?

Isn't this a "Vertical dipole"? Two quarter wave radiating elements? And
tower behind it will be some kind of reflector/director depending on height.
The radials seem unimportant if thought of this way.

Tim N3QE
________________________________________
From: Topband [topband-bounces at contesting.com] on behalf of Carl
[km1h at jeremy.mv.com]
Sent: Thursday, September 05, 2013 9:17 AM
To: topband
Subject: Topband: Are stacked verticals feasible?

Assuming that sufficient tower height was available, guy wires are insulated
or broken up into short non-resonant sections. Tower face is 12 or 18".

Start at 1/4 wave up with a 1/4 wave ground plane with radials sloping at
about 45 degrees. The vertical wire is 6-12' away from the tower face.

Then a 1/4 wave (or 1/8) up install a duplicate.

What does EZNEC say about this?

With the different spacings?

Effect of starting lower and how low before there are ground related
problems?

Phasing with coax or a LC network?

Switching in a delay line to tilt the lobe up a bit?

Curiosity got the cat!

Carl
KM1H




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Topband Reflector
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Topband Reflector