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1. [TowerTalk] SP7GXP antennas? (score: 1): Author: k7lxc--- via TowerTalk <towertalk@contesting.com>; Date: Thu, 21 Oct 2021 04:07:52 +0000 (UTC); Howdy, TowerTalkians - Has anyone ever used an antenna made by this guy? They sure are big - hi. Any comments appreciated. Cheers, Steve K7LXC ___________________________________________; /archives//html/Towertalk/2021-10/msg00107.html (6,780 bytes)
2. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: David Gilbert <ab7echo@gmail.com>; Date: Thu, 21 Oct 2021 00:49:38 -0700; 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; /archives//html/Towertalk/2021-10/msg00108.html (7,615 bytes)
3. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Thu, 21 Oct 2021 01:03:05 -0700; It's hard to believe that such an exact copy could have 2 dB more gain. 73, Jim K9YC _______________________________________________ _______________________________________________ TowerTalk mailing; /archives//html/Towertalk/2021-10/msg00109.html (7,463 bytes)
4. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: Fredric Serota <fserota@msn.com>; Date: Thu, 21 Oct 2021 09:03:00 +0000; I just put up a 13-6. Well made. Fun to put together. Flat SWR on all bands. Slightly smaller than my DB 36. So far out performing my old antenna but Ill find out for sure this weekend in CQWW Get Ou; /archives//html/Towertalk/2021-10/msg00110.html (9,769 bytes)
5. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: Jim Brown <jim@audiosystemsgroup.com>; Date: Thu, 21 Oct 2021 02:43:56 -0700; SWR is NOT a measure of antenna performance -- it has a small fractional dB effect on signal strength (the ability of the rig to put power into the line, and the loss in the line). Gain vs frequency; /archives//html/Towertalk/2021-10/msg00111.html (8,052 bytes)
6. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: Mpridesti via TowerTalk <towertalk@contesting.com>; Date: Thu, 21 Oct 2021 07:34:03 -0400; They are starting to pop up around the US. At Remote Ham Radio sites, Ray is a big user of them, as well their past NA distributor (no longer). Their cost is lower probably due to the lighter materia; /archives//html/Towertalk/2021-10/msg00112.html (8,439 bytes)
7. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: Jon Zaimes via TowerTalk <towertalk@contesting.com>; Date: Thu, 21 Oct 2021 12:10:43 +0000 (UTC); Hi Fred, Do they give any wind load specs on the manual? Not available on website, 73/Jon AA1K Sent from the all new AOL app for iOS I just put up a 13-6. Well made. Fun to put together. Flat SWR on; /archives//html/Towertalk/2021-10/msg00113.html (10,687 bytes)
8. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: <john@kk9a.com>; Date: Thu, 21 Oct 2021 10:38:31 -0400; 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; /archives//html/Towertalk/2021-10/msg00114.html (7,528 bytes)
9. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: Fredric Serota <fserota@msn.com>; Date: Thu, 21 Oct 2021 15:24:15 +0000; Jon, no they dont that I have seen. It is 60 pounds lighter than the DB36. Turning radius about the same Get Outlook for iOS<https://aka.ms/o0ukef> ________________________________ From: TowerTalk <t; /archives//html/Towertalk/2021-10/msg00115.html (13,941 bytes)
10. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: GEO Badger via TowerTalk <towertalk@contesting.com>; Date: Thu, 21 Oct 2021 16:59:00 +0000 (UTC); Jim, It's the dB grease that is used during assembly. =!8^} -- Ciao baby, catch you on the flip side 73 de W3AB/GEO WA2LSI, KE6RJW, W7B, AAR9AG http://www.w3ab.org You can say "over", you can say "o; /archives//html/Towertalk/2021-10/msg00116.html (8,527 bytes)
11. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: KD7JYK DM09 <kd7jyk@earthlink.net>; Date: Thu, 21 Oct 2021 10:46:15 -0700; SWR is NOT a measure of antenna performance Which explains why my 52 Ohm load doesn't get out too well... Kurt _______________________________________________ ________________________________________; /archives//html/Towertalk/2021-10/msg00117.html (8,785 bytes)
12. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: chris perri <EZRhino@fastmovers.biz>; Date: Thu, 21 Oct 2021 11:53:12 -0600; Exactly, its off by 2 ohms! Supposed to be 50. LOL! Chris KF7P _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contest; /archives//html/Towertalk/2021-10/msg00118.html (9,002 bytes)
13. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: Pete Smith N4ZR <pete.n4zr@gmail.com>; Date: Thu, 21 Oct 2021 14:28:32 -0400; Anybody remember Gotham antennas from the 1950s? Or all of the fanciful claims emanating from various mainstream antenna companies before Force 12 came on the scene and let in some much needed fresh; /archives//html/Towertalk/2021-10/msg00119.html (10,917 bytes)
14. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: David Gilbert <ab7echo@gmail.com>; Date: Thu, 21 Oct 2021 11:48:08 -0700; I own an Optibeam OB16-3 tribander as well as an Optibeam OB2-40 shorty 40. I modeled both antennas in EZNEC+ using the published dimensions, as well calculating the impedance of the short square tu; /archives//html/Towertalk/2021-10/msg00120.html (10,923 bytes)
15. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: Randy Farmer <w8fn@windstream.net>; Date: Thu, 21 Oct 2021 14:30:57 -0400; Sounds like they're specifying gain relative to isotropic, hence an extra 2.1 dB. 73... Randy, W8FN John KK9A His 16 element 20/15/10 tribander looks like an almost complete copy of my Optibeam OB16-; /archives//html/Towertalk/2021-10/msg00121.html (8,842 bytes)
16. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: David Gilbert <ab7echo@gmail.com>; Date: Thu, 21 Oct 2021 11:59:46 -0700; If that's the case, they were clumsy on their website because it clearly states dBd. Dave AB7E 73... Randy, W8FN On 10/21/2021 10:38 AM, john@kk9a.com wrote: I have modeled some OptiBeam antennas a; /archives//html/Towertalk/2021-10/msg00122.html (9,594 bytes)
17. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: Larry Banks via TowerTalk <towertalk@contesting.com>; Date: Thu, 21 Oct 2021 16:00:22 -0400; Are they mixing up dBi and dBd? 73 -- Larry -- W1DYJ I own an Optibeam OB16-3 tribander as well as an Optibeam OB2-40 shorty 40. I modeled both antennas in EZNEC+ using the published dimensions, as w; /archives//html/Towertalk/2021-10/msg00123.html (11,923 bytes)
18. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: Pete Smith N4ZR <pete.n4zr@gmail.com>; Date: Thu, 21 Oct 2021 16:15:31 -0400; From another angle, I note that Remote Ham Radio and W2RE uses (used?) these antennas at the Eastport, Maine station. An after-action report on how they performed and particularly how they stood up; /archives//html/Towertalk/2021-10/msg00124.html (13,026 bytes)
19. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: "Peter Voelpel" <dj7ww@t-online.de>; Date: Thu, 21 Oct 2021 22:26:27 +0200; I guess those who just copy antennas also don´t take the effort of calculations or measurements. 73 Peter, DJ7WW Sounds like they're specifying gain relative to isotropic, hence an extra 2.1 dB. 73..; /archives//html/Towertalk/2021-10/msg00125.html (9,781 bytes)
20. Re: [TowerTalk] SP7GXP antennas? (score: 1): Author: <john@kk9a.com>; Date: Thu, 21 Oct 2021 17:20:19 -0400; I would like to put up an isotropic antenna and compare it to my Yagis. John KK9A Sounds like they're specifying gain relative to isotropic, hence an extra 2.1 dB. 73... Randy, W8FN On 10/21/2021 10:; /archives//html/Towertalk/2021-10/msg00128.html (9,144 bytes)

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