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

Martin Cooper kd6yam at amsat.org
Mon Jun 17 17:16:47 UTC 2019

Thanks very much, everyone, for all of the feedback and suggestions.
Much appreciated!

Now to figure out how to adjust the DK7ZB designs slightly for
satellite frequencies...


On Sun, Jun 16, 2019 at 7:32 AM Martin Cooper <kd6yam 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.

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