[Top] [All Lists]

[TowerTalk] Guy wires as inverted Vee?

To: <>
Subject: [TowerTalk] Guy wires as inverted Vee?
From: (Tim Makins, EI8IC)
Date: Sat, 28 Apr 2001 11:36:16 +0100
----- Original Message -----
From: <>
To: <>
Sent: 27 April 2001 21:06
Subject: Re: [TowerTalk] Guy wires as inverted Vee?
> I believe an inverted vee will outperform a HORIZONTALLY POLARIZED
> DELTA LOOP (fed at the apex or in the center of the bottom wire) with
> the same Apex Height since the EFFECTIVE Height of the Delta Loop
> is much lower due to the bottom wire being so close to the ground.
> A VERTICALLY POLARIZED  Delta Loop IS a very effective DX antenna.
> Feed 1/4 WL down from the Apex.  Note that an equilateral loop for 80M
> is over 80 ft tall and thus must be "squished" to fit on a 70 ft tower,
> or, have the bottom corners pulled out from the tower.  The pattern of a
> vertically polarized Delta Loop is more nearly omni-directional (3 db
> F/S) than an Inverted Vee.

Yep - my experience too. I feed mine at the bottom corner with 1:1 balun and
75ohm coax, though have also used Belden 9207 which is a screened 100ohm
twinaxial, 8.4mm o.d. meant for office data networks but great for this
application too, even at hi-pwr levels.

I have mine on a 60 foot support, and the two bottom corners are pulled away
from the base so that the bottom horizontal side is about 8 foot from the
ground. I don't know, but suspect that the fact that this is now a sloping
delta means I get better low angle than if it was purely a vertical delta,
in the same manner as a sloping dipole. Perhaps some modelling-expert could
take a look at this ??? Anyway, it gives great bangs-per-buck, and keeps me
happy !!

73s Tim EI8IC Irish contester Site, with section on budget contesting.

List Sponsor: - Trylon self-supporting towers,
safety equipment, rigging gear, LOOS tension guages & more!

FAQ on WWW:     
Administrative requests:

<Prev in Thread] Current Thread [Next in Thread>