Topband: trimming elevated radials

[Ulrich Weiss]

hi Jeff,

I wouldn't attempt to tune the radials exactly to resonance, because that 
will be most difficult to achieve due to a number of reasons... the worst 
that may happen is that just one radial is exactly resonant, as it will take 
(almost) all the return current and diminish the effect of (horizontal) 
cancellation... make them all a little longer (or shorter) and tune the 
radiator for resonance...
good luck

Uli, DJ2YA


----- Original Message ----- 
From: "Jeff Blaine" <jeff at ac0c.com>
To: <topband at contesting.com>
Sent: Friday, March 29, 2013 6:56 PM
Subject: Topband: trimming elevated radials


> What is the preferred method of tuning elevated radials for uniformity?
>
> I realize you can measure the lengths, try to get uniform heights, etc so 
> that you match the model as close as possible.  However, it seems that 
> this is good only to the first approximation.
>
> There are two methods that I thought of.  Measuring the current at the 
> base of the vertical/radial union and trimming lengths iteratively trying 
> to get a uniform current reading on all elements.
>
> The second one was to disconnect all the radials.  And then connect them 
> one-by-one, trimming for the same resonance point for the single 
> radial+vertical as a pair.
>
>
> 73/jeff/ac0c
> www.ac0c.com
> alpha-charlie-zero-charlie
>
> All good topband ops know fine whiskey is a daylight beverage.
> _________________
> Topband Reflector
>