[amsat-bb] Fixed elevation - how many elements?

[Pedro Converso]

Hello Martin,

I use 2 x 5 elements yagis, for UHF & VHF horizontaly polarized on the
same boom inclined 25 degrees up, using FT-897 or FT-736, handled by
only azimuth rotator.

Decent results for FM and SSB Sats throughout all the pass.

73, lu7abf, Pedro

On 6/16/19, Martin Cooper via AMSAT-BB <amsat-bb at amsat.org> wrote:
> I'm contemplating building a couple of yagis, possibly even crossed
> ones, and putting them up at fixed elevation (i.e. az-only rotator).
> What I'm unclear about is how many elements to consider.
>
> My location is really pretty dreadful for seeing sky. There's a big
> hill to the NE that restricts me to above 40 degrees in that
> direction. I'm in a single-storey house, with neighbouring two-storey
> houses to the NW, SW, and S. In between all that, there are other
> single-storey houses, and trees in most of the gaps between houses. I
> can't afford to put up a tower (and it could never get above the hill
> anyway), so I'm looking at not too much above my roofline.
>
> To at least get through the trees, I'd think more elements would be
> better. But more elements narrows the beam, and at fixed elevation,
> that, at some point, will restrict even further how much of the sky I
> can play with.
>
> I'm looking for thoughts on how many elements would be recommended,
> and how many would be too many, for a fixed elevation, both for VHF
> and UHF. Ultimately, I'd like to be able to get on the linears, so not
> limited to the FM sats. Any thoughts would be much appreciated.
>
> Thanks in advance.
>
> Martin.
> KD6YAM
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