[amsat-bb] Re: Gain VS Bandwidth at 2.4GHZ
kl7uw at acsalaska.net
Sat May 16 12:21:32 PDT 2009
At 10:33 AM 5/16/2009, Greg D. wrote:
>Pretty much every Wi-Fi antenna I've ever seen is linearly
>polarized. The "diversity" antennas are two separate antennas,
>usually one vertical and one horizontal, with separate cables going
>to two radios. Going circular would seem to be a no-brain
>improvement for the Wi-Fi crowd, but I think I've only seen one vendor do it.
>Enjoy the new toy,
I have toyed with using a comercial medium gain patch array for 2.4
GHz Leos. I would guess that there is no incentive to use circular
pol for terrestrial data links. Even reflections and multi-path
signals would remain linear. Space com is a totally different deal
and circular makes sense if there is room for the CP antenna on the sat.
I still have my 85cm offset dish fed with short helix for AO-40 2.4
GHz, but I expect the narrow beamwidth would be lots of trouble for
manual tracking 2.4 Leos. That is why I thought to use a 10-dB
commercial antenna (also cheap and easy). Is CP a better
idea? ...and would one need to reverse the sense on 2.4 GHz very often?
73, Ed - KL7UW
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