[amsat-bb] J-Pole Antenna
hb9bnk at uska.ch
Mon May 13 09:26:43 PDT 2013
The antenna, that I want to build, is described in a paper
(probably 20 years old) by Dick, WD4FAB, titled 'Antennas for
microsat ground stations', and the paper describes the large time,
a LEO remains at low elevations - about 76 % below 20 degrees -
and then concludes, that this is fine for a J-Pole.
I am aware of the fact, that the microsats (AO-16 et.al.) had a
mean altitude of 800 km, while my 'targets' fly (sometimes) at
higher altitudes. So, some problems are to be expected.
(In fact, I was working with a small yagi with fixed elevation of
about 15° for several years but my rotor has problems and the
access to it is complicated and the repair also, so that I decided
to try something simpler until the rotor is fixed - or replaced.
Living in a tight environment, I cannot put up a nice antenna
system, but to compromise is part of our hobby.)
So, I keep you informed about my results.
73 Werner, HB9BNK
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