[Towertalk] Advice on Re-doing My Antennas

[n4kg@juno.com]

Ordinarily, I would recommend placing a 40M dipole
parallel to the Elements of a tribander to avoid interaction
with an end loaded boom.  A 24 ft boom with 20M elements
is self resonant very near 40M.  A second advantage for
this configuration is that all antennas will be aimed in
the same direction.

Since you have a C3SS with insulated elements on a short 
(12 ft) boom, you could probably realize less interaction with 
the 40M dipole parallel to the boom.  This is NOT the case
for grounded element beams, especially with longer booms.

Tom N4KG

On Tue, 16 Apr 2002 06:24:55 -0700 "Eric Rosenberg" <wd3q@erols.com>
writes:
> 
> I've finally collected everything I need to re-do my small lot
> (micro-pistol) roof set-up. 
> 
> I'm replacing my 6 ft. quadpod roof tower with a somewhat 
> unconventional
> 10 footer (an older, refurbished TET model that has a 4 foot
> base as a quadpod and a 6 foot, 4 sided, 6" face top section
> that will need to be guyed).
> 
> My plan is to put the C3-SS up 4 or so feet over the thrust bearing.
>  I have a F12 rotatable dipole (actually, a C3->C4 expansion
> kit), and want to put that above the C3-SS. 
> 
> The questions are:
> -what's the recommended material for guying?
> -how high do I put the rotatable dipole over the 
>   tribander?  
> -does the rotatable dipole go perpendicular or parallel to 
>   the tribander elements? 
> -does the rotatable dipole need a balun? 
> 
> Thanks in advance, 
> 
> Eric W3DQ
> Washington, DC
> 
>  
> 
> 
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