I was wondering about the 90-degree business for the 15m and 20m beams, too.
At W5RRR club station, we had a 4-el 15m beat at 90' and a 204ba at 80',
both pointing the same direction. I don't ever recalling any interaction
problems. Both were hoses and both were great performers.
I thought there were real interaction effect(s) between a 40m beam and a
triband beam...not sure exactly what, but that seemed to be the reason for
mounting them at right angles each other.
I don't think the 15-to-EU/20-to-Carib thing would work well...especially
when you want to do 20-to-eu and 15-to-carib.
> Back in the 60s-70s, Hy-Gain advertised/sold the 204 and the
> 3-L 15M -- I had that setup in `73 ... was on a 10 foot mast,
> so spacing must not have been over 7 feet ... on top of a 67'
> crankup .. worky worky. Both aimed at the same northward
> pointing owl ...
> The setup was featured in magazines and brochures of the era ....
> What is your purpose for the booms at 90 deg ??? I used to
> put up 40M
> beams that way, due to the different propagation between
> bands, but 15 and 20 --hmmmm ... just curious? 15 to EU, 20
> to Carrib?
> 73--- Mark AA6DXX
> I have a 204BA in a tower....
> I want to put a 153 CA 3 el 15 meter on the same mast...but
> the boom of the
> Ca will be 90 degres with the boom of the 204...
> I wonder what would be the minimum distance between the two
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