[BC] Null Distortion

[Thomas G. Osenkowsky]

----- Original Message ----- 
From: <DHultsman5 at aol.com>
To: <broadcast at radiolists.net>
Sent: Friday, June 09, 2006 6:37 PM
Subject: Re: [BC] Null Distortion


>
> In a message dated 6/9/2006 4:09:03 PM Central Daylight Time,
> tosenkowsky at prodigy.net writes:
>
> Even in  a ND system
> there are changes that occur with frequency. The goal of the  design of an
> antenna system is to preserve impedance and pattern bandwidth.  Often
> times, a compromise(s) is necessary.
>
> Tom Osenkowsky,  CPBE
>
>
>
> I guess if we had a tower that was an adjustable height,  we could
estimate
> the height for frequency,  measure the tower R and +-j at that  height
look at
> its plot and plot it on the Smith chart and if the bandwidth  isn't
correct,
> raise the tower 2 feet make the measurments again, if no  better, lower
the
> tower two feet and do the same and if a trend either way was  looking
better
> then raise or lower the height for best load and symmetry as  measured.
Then
> weld up the tower.
>
> Thats based on no FAA or zoning problems and a telescoping tower.
???????
>
> Dave
>
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