How are you adjusting the phase?
K9EZ/4
b0zo #133
www.ab0zo.com
On Tue, Sep 9, 2008 at 3:34 PM, Andrew Ikin <andrew.ikin@btopenworld.com>wrote:
> Hello Guys
>
> Having struggled to model an 3 element endfire Active Vertical array using
> the same Phasing lines from 0.53MHz to 2.12MHz. I find that I can achieve a
> very good elevation plot with very low rear lobes (-30dB). Even the plot at
> 2.65MHz only shows 2 small (-22dB) rear lobes!!! Also this model is very
> tolerant of several dB amplitude difference on the outer elements providing
> that the centre element is the sum of the 2 outer ones.
>
> I have tried to do the same with the 4 Square, but there is always a large
> rear lobe on the elevation plot 10-15dB higher than the 3 element endfire,
> no matter how I adjust the phase. Am I doing something wrong or is there a
> fundamental problem with the 4 Square?!
>
> Both arrays have 40m Element spacing.
>
> 73
>
> Andrew G8LUG (not active)
>
>
>
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