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Old 11-29-2017, 07:11 AM
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blackshire blackshire is offline
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Join Date: Jan 2009
Location: Fairbanks, Alaska
Posts: 5,571
Default Payload antennas (links)

Hello All,

Before I get to what I came across just this morning (the information and links on it are included below), I was wondering if a new forum section--devoted to model rocket (and perhaps also HPR rocket) *payloads*, particularly active ones containing instruments and transmitters--might be worthwhile to add to our forum here. ALSO:

I just found documents that describe and illustrate how canted turnstile omnidirectional antennas are installed on spacecraft (including how they are coupled to the spacecraft’s transmitters and receivers); the below-linked 1967 NASA paper says that spacecraft’s sizes, in terms of wavelengths, do significantly affect how the matching is done, as I’d suspected—but couldn’t find any information on—until now, *and*:

As well as being useful for building AMSAT/OSCAR satellites of all sizes, including CubeSats and even < 10 gram FemtoSats, these references might also be useful for constructing effective antennas and matching systems for radio transmitter-equipped (and TV transmitter-equipped) model rocket and HPR payloads, so I figured I’d pass them along to you; they are:

“The Canted Turnstile as an Omnidirectional Spacecraft Antenna System” (by R. B. Jackson, NASA Goddard Space Flight Center, 9/9/1967):

Here are other canted turnstile satellite antenna articles:

I hope this material will be helpful.
Black Shire--Draft horse in human form, model rocketeer, occasional mystic, and writer, see:
All of my book proceeds go to the Northcote Heavy Horse Centre
NAR #54895 SR
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