[amsat-bb] Re: Crossbooms ... my questions
mat_62 at netcommander.com
Wed Jan 10 18:50:16 PST 2007
I homebrewed my antennas and it wouldn't have been that big a deal to
make crossed yagi's for CP as far as the mechanical end of it went but
for my first attempts at satellite, I went with linear polarization
just for simplicity's sake. I do ok with them on LEO's but since I've
never had the CP, I can't make a quantitive comparison. My biggest
stumbling block with CP was figuring the length of phasing harnesses and
such because I don't have the equipment to do so. Of course, if you're
buying a set, I suppose all that's done for you.
> As a reasonably long time licensed ham (40 years), but very new to
> satellites, I would like to ask the brain trust whether CP antennas are
> really needed. I am ready to buy a set, but in poking around the net, I
> found this exchange by Mike , K6MYC, about not using CP antennas:
> Look at http://www.qth.com/ka9fox/ant-nest.txt
> Look towards the bottom, and Mike's replies are in caps.
> I do not have the real estate for separate 144/432 antennas for
> terrestrial and sat. I have the az/el rotors.
> So whats the thought on this? Should I just go with a pair of H-pol
> beams and leave well enough alone, or should I go with the CP antennas?
> Tom Bosscher K8TB
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