[amsat-bb] Circular Antennas
kq6ea at verizon.net
Fri Aug 12 21:43:41 UTC 2016
I'm guessing here that you mean the "bed spring on a stick" kind of
normal-mode helix antenna that you point at the bird, rather than some
other *omnidirectional* helical antenna like a Quadrifilar Helix
Antenna, aka "QHA"
Well, I'm not really sure if they were ever "in fashion". They're pretty
easy to build, pretty broadbanded, and are quite forgiving of minor
errors in construction, but seeing as they have no way to switch
polarization, which can be pretty handy at times, they're pretty limited.
I've built a couple, one for 1.2GHz, and another for 70cm, and they work
quite well for being so simple.
One for 2 Meters is quite a bit bigger, and they start to get cumbersome
Other than the two I built, I've never seen an Amateur Radio version "in
the wild", although I have seen numerous ones for commercial and
73, Jim KQ6EA
On 08/12/2016 06:40 PM, Gerald Payton wrote:
> Trying to get back into satellite radio from the early 2000s, I wonder what happened to circular helical antennas. Are they out of fashion now?
> Jerry AB5R
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