[TowerTalk] SP7GXP antennas?

john at kk9a.com john at kk9a.com
Thu Oct 21 17:20:19 EDT 2021


I would like to put up an isotropic antenna and compare it to my Yagis.

John KK9A

From: Randy Farmer [mailto:w8fn at windstream.net] 
Sent: Thursday, October 21, 2021 2:31 PM
To: john at kk9a.com; towertalk at 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 at 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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