[amsat-bb] J-Pole Antenna

Werner, HB9BNK 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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