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Re: [TowerTalk] SP7GXP antennas?

To: <towertalk@contesting.com>
Subject: Re: [TowerTalk] SP7GXP antennas?
From: <john@kk9a.com>
Date: Thu, 21 Oct 2021 17:20:19 -0400
List-post: <mailto:towertalk@contesting.com>
I would like to put up an isotropic antenna and compare it to my Yagis.

John KK9A

From: Randy Farmer [mailto:w8fn@windstream.net] 
Sent: Thursday, October 21, 2021 2:31 PM
To: john@kk9a.com; towertalk@contesting.com
Subject: Re: [TowerTalk] SP7GXP antennas?

Sounds like they're specifying gain relative to isotropic, hence an extra 2.1 
dB.

73...
Randy, W8FN
On 10/21/2021 10:38 AM, john@kk9a.com wrote:
I have modeled some OptiBeam antennas and the published specs seem accurate.
Of course getting 2db more gain from the same boom length would circumvent
the laws of physics. I recently installed a 4el 40m OptiBeam on my tower,
the SP6GXP version is 37% lighter.

John KK9A


David Gilbert AB7E wrote:

His 16 element 20/15/10 tribander looks like an almost complete copy of 
my Optibeam OB16-3, except that SP6GXP claims about 2 db more gain on 
each band and uses lighter weight materials.

Dave   AB7E

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