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Re: s-band omni



Amateur satellites will require a high-gain antenna. A simple vertical
ground-plane antenna is only 2.5" high at 2400 MHz so it doesn't have
sufficient capture area. A QFH will be slightly larger and have 3 dB more
gain, but won't be sufficient. ATV and HSMM (amateur 802.11) users are all
using high-gain antennas (either vertical colinear arrays or yagis) and
those signals are much stronger than satellites.

73,

John
KD6OZH

----- Original Message -----
From: "Kyle Yoksh" <yokshs@planetkc.com>
To: "Amsat-bb" <amsat-bb@amsat.org>
Sent: Monday, March 28, 2005 15:39 UTC
Subject: [amsat-bb] s-band omni


> Hi everyone,
>
> I'm thinking about mounting an S-band downconverter outdoors for
occasional
> use, not specifically for listening to the birds. This unit will be
mounted
> in a fixed location (no rotors).  It would be great if the finished
antenna
> was capable of hearing AO-51 also.
>
> I'd like some suggestions on which antenna I should use. The only
> requirements are:
>
> * Low or NO cost (I don't want to BUY an antenna) hi hi
>
> * Easy to build with ordinary tools
>
> * Little to no test equipment needed
>
> * Omnidirectional
>
> * Feed should be via short coax section if possible
>
> I've heard good things about the QFH, although I've never built one
myself.
>
> Also, has anyone tried a plain-Jane vertical on S-band?
>
> Thanks for any suggestions.73,
>
> Kyle Yoksh
> K0KN
> Olathe, Kansas
> Amsat# 35249
> ----
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----
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