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ZL3AI > APRDIG 16.01.07 07:34l 93 Lines 2419 Bytes #999 (0) @ WW
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Subj: [APRSSIG] Vol 31 #15, 1/1
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From: ZL3AI@ZL2BAU.#79.NZL.OC
To : APRDIG@WW
Today's Topics:
1. 145 MHz QUAD dimensions (Andrew Rich)
2. Re: 145 MHz QUAD dimensions (Ray Wells)
3. RE: 145 MHz QUAD dimensions (Dave Sloan)
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Message: 1
Date: Sat, 13 Jan 2007 09:09:54 +1000
From: "Andrew Rich" <vk4tec_at_tech-software.net>
Subject: [aprssig] 145 MHz QUAD dimensions
Building a quad for ANDE and RAFT.
Any good designs floating around amoungst members ?
I am a little confused, this web site shows feed the loop at the top gives
you vertical polarisation ? This does not sound correct ?
http://www.southgatearc.org/techtips/quad.htm
PS - PCSAT data stream server at :-
http://vk4tec.no-ip.org/sat_panel.htm
Andrew Rich
Amateur radio callsign VK4TEC
email: vk4tec_at_tech-software.net
web: http://www.tech-software.net
Brisbane AUSTRALIA
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Message: 2
Date: Sat, 13 Jan 2007 10:23:05 +1100
From: Ray Wells <vk2tv_at_exemail.com.au>
Subject: Re: [aprssig] 145 MHz QUAD dimensions
Andrew Rich wrote:
>Building a quad for ANDE and RAFT.
>
>Any good designs floating around amoungst members ?
>
>I am a little confused, this web site shows feed the loop at the top
>gives you vertical polarisation ? This does not sound correct ?
The polarisation of a quad is determined by the polarisation at the feed
point..
If the elements immediately adjacent to the feed point are horizontal,
so too will be the polarisation of the antenna. If they are vertical,
polarisation will be vertical.
The same applies to a "corner" fed quad. If the elements adjacent to the
feed point are predominantly one polarisation, that will be the
polarisation of the antenna.
An antenna fed at the centre of the symbol is
-- horizontal
| vertical
^ or v horizontal
Ray vk2tv
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Message: 3
Date: Fri, 12 Jan 2007 16:36:28 -0700
From: "Dave Sloan" <desloan_at_earthlink.net>
Subject: RE: [aprssig] 145 MHz QUAD dimensions
HI Andrew,
From this web site http://www.softcom.net/users/kd6dks/quad.html it shows
that feeding from the side gives vertical and bottom gives horizontal
polarization. I am going to build a quad for the same reason.
Dave.
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End of aprssig Digest, Vol 31, Issue 15
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