Re: Satellite reception problems

Peter Duncanson wrote:
On Thu, 30 Apr 2009 18:27:54 +0100, "Hawkins"
<hawkinsfamily3@xxxxxxxxxxxxxxxxxxx> wrote:


"Jeff Layman" <jmlayman@xxxxxxxxxxxxxxx> wrote in message
news:gtce3h$mma$1@xxxxxxxxxxxxxxxxxxxx
After setting up reception on Astra 2 ok earlier in the year, leaf
appearance has badly affected reception here in West Sussex (I thought
it might...) . The beam arrives effectively in the "V" created by the
crowns of a couple of partially overlapping trees. One of these is a
damn great sycamore - already around 25 m high - but with a lot more
growth left in it. That is the one causing the problem.

But why has it affected horizontal polarisation reception much more than
vertical? I've checked the LNB and that hadn't moved. But just in
case I loosened and rotated it clockwise and anticlockwise in several
positions. No difference in the non-existent H reception, but
eventually lost V too, so put it back where it was. Minor adjustment
of the dish resulted only in losing the V reception as well as the H.

Options are limited. At present the dish (65 cm) is on the bottom end
of a 1.5" 16g galvanised steel pole between a 24" K and T bracket, just
below the gutter line. The T is at the extreme bottom of the 3m pole,
with the K about 50 cm above it. At the top of the pole is an
18-element group A yagi (Crystal Palace), and about 50 cm below that is
a 15-element group E yagi (Midhurst). I suppose I could move the dish
up about 1.5 m to just below the Midhurst aerial, but would it
interfere with it? Also, with the dish now well above the gutter, and
much more exposed to the wind, the pole would be taking much more
strain. As would the T and K mounts, which seem to be fixed with a 5 x
12mm AF hex-headed screws into some sort of plastic plug fixing. I
suppose I could get another mount and move the dish back, but I can't
add more than a couple of meters, and that translates to only 1 metre
in gained height at the tree. Also, that would only work in the same
line-of-sight - moving it back along the same wall would only change
the beam direction to right through the main part of the tree crown!
And it would probably only gain a couple of years' viewing before the
tree obscured that signal too.

Any suggestions other than a chainsaw?

--
Jeff


How about squatting down below your dish then aim at the sky between the
two trees. Use your elevation protractor and there may be a gap between
the tree trunks below the foliage. A bit of low level pruning would be
easier than felling the whole caboodle.

Assuming that he is the owner of the tree.

Unfortunately I'm not. Even if I was, surgery on such a tree would (a)
require approval from the local council (b) probably be prohibitively
expensive

I've also thought of "undershooting", but there are other trees in front and
behind which block line-of-sight, even from a ground-level dish.

--
Jeff


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