On Mar 6, 2012, at 9:38 AM, Bob K6UJ wrote:
>
> This is a follow up to my post asking for feedback on spacing a WARC beam
> above a tribander.
> First let me thank you guys that have responded with your experience in this.
> Your input is very much
> appreciated. To refresh, my query was to find the optimum space to leave
> between my Force 12 C3 tribander
> and a Force 12 2/2 WARC beam mounted higher on the mast to minimize
> interaction between them.
> After learning about actual install results from you guys I called Force 12
> and asked for their inout on this.
> They said this is a frequent question they receive. Below is a chart they
> provided showing a C-19XR and WARC 2/2
> at various spacings from 7 feet to 16 feet. They said I will get similar
> results with my C3 and the WARC 2/2 because
> the C31 is an expanded design of the basic C3. Take a look at the numbers.
> Its interesting to note that at 8 feet spacing
> the C31 gain actually goes up by .5 DB on 15 meters ! Their recommended
> space is 8 feet. The feedline impedance
> stays close to normal and a nice .5db gain on 15mtrs.
>
> Thanks guys for the feedback on this.
> Here is the Force 12 Chart
>
> 73,
> Bob
> K6UJ
>
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