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KB2VXA > HDTV 13.10.11 14:34l 28 Lines 976 Bytes #999 (0) @ WW
BID : 8145_VK6ZRT
Read: GUEST
Subj: Re: G6KUI > polarization
Path: IZ3LSV<IK2XDE<PY1AYH<PY1AYH<CX2SA<VE3UIL<VK6ZRT
Sent: 111013/1313Z @:VK6ZRT.#BUN.#WA.AUS.OC #:8145 [Boyanup] $:8145_VK6ZRT
From: KB2VXA@VK6ZRT.#BUN.#WA.AUS.OC
To : HDTV@WW
Hi Pete and all,
When it comes to circular broadcast polarization left or right doesn't
matter as there are no circular receiving antennas. Neither does the 3dB
loss as it is more than made up for with multi bay gain transmitting
antennas.
I guess you had only one Amateur contact using circular because it is
very rarely used for point to point terrestrial communications. It's
common for space communications because you never know the bird's
polarization at any moment. Tumbling causes cross polarization fades
which are eliminated with circular and since you have an X array you know
all you have to do is feed each driven element 1/4 wave out of phase with
the other.
Back to broadcast for a moment, when you're spitting megawatts who cares
about a few dB loss? (;->)
73 de Warren
Station powered by JCP&L atomic energy, operator powered by natural gas.
Message timed by NIST: 13:12 on 2011-Oct-13 GMT
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