May I take this thread a tad off subject...does anyone following this thread
have any experience with the 5 band Spider Beam? I am curious what users think
of it in terms of performance and durability? Also, how well does the
aluminum, rotating mast system work? When guyed according to spec is the
rotating mast system stable enough for a permanent installation?
Mike W5FTD
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
> Jim Thomson
> Sent: Sunday, April 12, 2015 10:32 PM
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] antenna choices for K4XS
>
> Date: Sun, 12 Apr 2015 15:24:27 -0400
> From: "Joe Subich, W4TV" <lists@subich.com>
> To: towertalk@contesting.com
> Subject: Re: [TowerTalk] [Bulk] Re: antenna choices for K4XS
>
> K7LXC and N0AX published two widely respected *scientific* studies of
> tribander performance using validated measurement techniques to
> directly compare the performance of the tested antennas against a
> standard (dipole). These were field tests not some modeling exercise
> that failes to capture real world losses in the antenna design.
>
> In those tests, the Mosley antennas TA-33, PRO-57B and PRO-77 were the
> *worst* performers in their respective (small and large tribader)
> categories. The TA33 averaged LESS than 1 dB gain compared to a dipole
> on 20 meters and LESS than 1.5 dB gain compared to a dipole on 10
> meters. The PRO57B and PRO77 both averaged LESS than 1 dB gain
> compared to a dipole on 20 meters and more than 1 dB *LESS* gain
> compared to a dipole on 10 meters.
>
> 73,
>
> ... Joe, W4TV
>
> ## Oh this just cracks me right up ! Megabuck Mosley PRO 57 / 77
> has essentially no gain on any band.
> The kicker is.... the PRO-57/77 has LESS gain on 10m vs the paltry
> TA-33 !!! WTF ?
>
> ## I mean..come on folks. LESS than 1 db gain on 20M.....vs a dipole
> for the 57/77 .
> 57/77 has NEGATIVE GAIN on 10M.....by > 1 db.....vs a dipole.
>
> ## My conclusion is.... if you want some gain on 10M.... a dipole will
> do the trick...and has
> >1db more gain than the megabuck mosely.
>
> ## 55/77 has LESS than 1db gain on 20M....vs a dipole.
>
> ## No wonder a 2 el F12 will wipe the floor with a mosley..and so
> will a gotham quad.
> What the mosley will do is provide some FB and FS and that’s about it.
>
> Jim VE7RF
>
>
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