- 1. [TowerTalk] 30m Dipole (score: 1)
- Author: "crawfish" <crawfish@surfmore.net>
- Date: Thu, 3 Aug 2006 11:25:04 -0500
- I had a book that said 468 divided by frequency for wires only, and 455 divided by frequency for tubing.I always added 6% to the 468 for wires and started trimming 3 inches off each end. Never had to
- /archives//html/Towertalk/2006-08/msg00085.html (7,260 bytes)
- 2. Re: [TowerTalk] 30m Dipole (score: 1)
- Author: Bill Turner <dezrat@copper.net>
- Date: Thu, 03 Aug 2006 09:39:59 -0700
- ORIGINAL MESSAGE: -- REPLY SEPARATOR -- You can do the trimming in one step. After putting the antenna up, measure its resonant frequency and then calculate the percentage change needed to bring it t
- /archives//html/Towertalk/2006-08/msg00086.html (7,899 bytes)
- 3. Re: [TowerTalk] 30m Dipole (score: 1)
- Author: mike l dormann <w7dra@juno.com>
- Date: Thu, 3 Aug 2006 09:41:08 -0700
- i forget we live in a world without antenna tuners mike w7dra _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesti
- /archives//html/Towertalk/2006-08/msg00087.html (6,921 bytes)
- 4. Re: [TowerTalk] 30m Dipole (score: 1)
- Author: Bill Turner <dezrat@copper.net>
- Date: Thu, 03 Aug 2006 09:52:19 -0700
- ORIGINAL MESSAGE: -- REPLY SEPARATOR -- Without antenna tuners? Nearly all modern rigs have them built in, don't they? Bill, W6WRT _______________________________________________ ____________________
- /archives//html/Towertalk/2006-08/msg00088.html (7,006 bytes)
- 5. Re: [TowerTalk] 30m Dipole (score: 1)
- Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
- Date: Thu, 3 Aug 2006 13:23:13 -0400
- I dunno, some of us still use manual tuners. I like to have a bunch of antennas that each exhibit low SWR in my favorite parts of the bands on a switch. I'm an incurable band hopper when I'm operatin
- /archives//html/Towertalk/2006-08/msg00089.html (8,233 bytes)
- 6. Re: [TowerTalk] 30m Dipole (score: 1)
- Author: Jan Erik Holm <sm2ekm@telia.com>
- Date: Thu, 03 Aug 2006 20:05:28 +0200
- No no, these days there are even auto tuners. People never have to use the brain. Just string any old piece of wire out and of you go. Ooooh, I forget, you get someone to do it for you. Sorry I could
- /archives//html/Towertalk/2006-08/msg00091.html (6,936 bytes)
- 7. Re: [TowerTalk] 30m Dipole (score: 1)
- Author: "Scott Stembaugh" <radio.n9ljx@gmail.com>
- Date: Thu, 3 Aug 2006 15:50:45 -0400
- As I understand it that just makes the radio happy. What is the ERP delta between a resonate antenna and a non-resonant tuner-tuned antenna? How much signal is lost on the feedline? --sas -- -- N9LJX
- /archives//html/Towertalk/2006-08/msg00092.html (8,152 bytes)
- 8. Re: [TowerTalk] 30m Dipole (score: 1)
- Author: Jim Lux <jimlux@earthlink.net>
- Date: Thu, 03 Aug 2006 13:29:35 -0700
- Essentially identical. Depends on the loss of your feedline. It's a dipole, so clearly you aren't obsessing about eking out the last tenth of a dB of gain. Say you're pretty far off 50+50j instead of
- /archives//html/Towertalk/2006-08/msg00093.html (10,076 bytes)
- 9. Re: [TowerTalk] 30m Dipole (score: 1)
- Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
- Date: Thu, 3 Aug 2006 16:42:14 -0400
- Bob, Added some servo controlled gearmotors. I wrote it up at http://www.n3ox.net/projects/servo if you care to check it out. 73, Dan _______________________________________________ _________________
- /archives//html/Towertalk/2006-08/msg00094.html (8,197 bytes)
- 10. Re: [TowerTalk] 30m Dipole (score: 1)
- Author: "Keith Dutson" <kdutson@sbcglobal.net>
- Date: Thu, 3 Aug 2006 15:49:52 -0500
- Essentially identical. -- Are you making some assumptions here? What is I have a perfectly resonant coax fed dipole at 3850 KHz at 140 feet and run 200 watts CW. Now compare this to a 30 foot long p
- /archives//html/Towertalk/2006-08/msg00095.html (8,074 bytes)
- 11. Re: [TowerTalk] 30m Dipole (score: 1)
- Author: "Dan Hearn" <dhearn@air-pipe.com>
- Date: Thu, 3 Aug 2006 14:06:17 -0700
- Additional loss occurs in the tuner which may be greater than xmsn line loss. QST has had measured losses for various commercial tuners as the subject of 1 or more articles. The losses on low bands a
- /archives//html/Towertalk/2006-08/msg00096.html (9,669 bytes)
- 12. Re: [TowerTalk] 30m Dipole (score: 1)
- Author: "Dan Zimmerman N3OX" <n3ox@n3ox.net>
- Date: Thu, 3 Aug 2006 17:30:29 -0400
- I think the implicit assumption throughout this thread is that you're comparing a coax fed dipole that you trimmed to be resonant at 3850kHz with a coax fed dipole that you just put up after cutting
- /archives//html/Towertalk/2006-08/msg00100.html (9,580 bytes)
- 13. Re: [TowerTalk] 30m Dipole (score: 1)
- Author: SavageBR@aol.com
- Date: Thu, 3 Aug 2006 17:32:32 EDT
- Enough, enough already _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mail
- /archives//html/Towertalk/2006-08/msg00101.html (7,782 bytes)
- 14. Re: [TowerTalk] 30m Dipole (score: 1)
- Author: "Peter Voelpel" <df3kv@t-online.de>
- Date: Fri, 4 Aug 2006 00:14:31 +0200
- I never need an antenna tuner and have none in use, except for using a fieldday dipole as allband antenna which a built in tuner would not handle anyway 73 Peter Without antenna tuners? Nearly all mo
- /archives//html/Towertalk/2006-08/msg00103.html (8,498 bytes)
- 15. Re: [TowerTalk] 30m Dipole (score: 1)
- Author: Jim Lux <jimlux@earthlink.net>
- Date: Thu, 03 Aug 2006 15:48:52 -0700
- Yes, I was assuming that the resonant and non-resonant antennas were "about" the same length and installed in "about" the same place. ERP (but not EIRP) would be the same (except for copper losses in
- /archives//html/Towertalk/2006-08/msg00104.html (10,342 bytes)
- 16. Re: [TowerTalk] 30m Dipole (score: 1)
- Author: Jim Lux <jimlux@earthlink.net>
- Date: Thu, 03 Aug 2006 16:28:21 -0700
- Which is why it's worth playing with something like XLZIZL.. (which calculates tuner loss) I also note that the QST reviews don't test into a mismatched *reactive* load, which, after all, is MUCH mor
- /archives//html/Towertalk/2006-08/msg00106.html (9,750 bytes)
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