Hi Timon,
With multiple towers available, I would keep my 40 meter antennas off any
tower with 15 meter antennas -- whether monobander 15's or tribanders. Too
often 40's disrupt the pattern of the 15's. It seems to be very antenna-
and spacing- specific, and I am not 100% confidant in modeling for this
issue.
GL es 73,
Dave K3ZJ
On Sun, Aug 24, 2014 at 5:25 PM, Timon Kruijer <Pa1t@xs4all.nl> wrote:
> Hello fellow contesters.
>
>
>
> I have an antenna setup question.
>
>
>
> This year (and the next) I am building a new HF station. Next to the house
> I
> will have four rotary towers standing in a square which are 40 meters
> apart.
> The towers are rotatable and are 25m (83 feet) high from the ground. Every
> tower will also have a rotor in the top with a 2 meter mast so in total 27
> meters (90 feet). The towers have rings on 24 meters and on 11 meters (not
> fixed yet) as they are still lying on the ground.
>
> To rotate and calculate the directions for each tower and the top antenna I
> use Microham Station Master de Luxe.
>
> My goal is to have a competitive contest station for SO2R, Multi Singe and
> Multi-2 use.
>
> What would be a good suggestion for the antennas in the four towers?
>
> The terrain is flat.
>
>
>
> The antennas I have available at the moment are:
>
> - 2 el Force 12 40 meters
>
> - 4 el Steppir 10-15-20 meters
>
> - Optibeam 10 15 20 meters
>
> - Force 12 c31xr 10 15 20 meters
>
> My idea so far is to use these 4 antennas for multipliers etc.
>
> I would like to have additional 2 antenna stacks for 20, 15, and 10 meters
> (which I have to build).
>
>
>
> A possible setup could be:
>
>
>
> Rotatable Tower 1
>
> top rotatable, Steppir
>
> bolted at the tower 20 meter yagi
>
> bolted at the tower 20 meter yagi
>
>
>
> Rotatable Tower 2
>
> top rotatable, c31xr
>
> bolted at the tower 15 meter yagi
>
> bolted at the tower 15 meter yagi
>
>
>
> Rotatable Tower 3
>
> top rotatable, 2el 40m
>
> bolted at the tower 10 meter yagi
>
> bolted at the tower 10 meter yagi
>
>
>
> Rotatable Tower 4
>
> top rotatable, 3 el 40m
>
> bolted at the tower optibeam 10 15 20M
>
> bolted at the tower 3 el 40m
>
>
>
> Or setup 1 multiplier tower and use the others for 10 to 40 meters. Which
> band to have a double set antennas when this would be a solution?
>
> For 40 and 80 meters I will have additional 4 squares behind these towers.
> Also possible would be to have wire 4 squares hanging on ropes between the
> towers (between the top rings on 24 meters).
>
> For 160 meters the towers can be a 4 square by itself (they are isolated).
> Also the ropes could be again for a 160 meter antenna.
>
>
>
> Suggestions and comments are very welcome. Please your ideas.
>
>
>
> '73 Timon
>
> PA1T
>
>
>
> Home page www.pa1t.com
>
> Tel 31 (0)598416308
>
> Cell phone 31 (0)657545506
>
>
>
> _______________________________________________
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