[TowerTalk] SP7GXP antennas?

[Peter Voelpel]

I guess those who just copy antennas also don´t take the effort of
calculations or measurements.

73
Peter, DJ7WW

-----Original Message-----
From: TowerTalk [mailto:towertalk-bounces at contesting.com] On Behalf Of Randy
Farmer
Sent: Donnerstag, 21. Oktober 2021 20:31
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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