[amsat-bb] Fixed elevation - how many elements?
hbasri.schiers6 at gmail.com
Mon Jun 17 20:54:08 UTC 2019
The EAntenna is a DK7ZP design, 5 EL on 2m, 8 EL on 70cm single feed,
designed for LEO sats.
On Mon, Jun 17, 2019 at 12:21 PM Martin Cooper via AMSAT-BB <
amsat-bb at amsat.org> wrote:
> 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.
> > KD6YAM
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