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1. [TowerTalk] Antenna problem? (score: 1): Author: K7LXC@aol.com; Date: Thu, 6 Oct 2005 11:45:58 EDT; Howdy, TowerTalkians -- I've got an antenna problem and I'm stumped. An M2 15M monobander developed some high swr - 3:1 or more where it used to be 1.1:1. I took a crane and man-basket up to the feed; /archives//html/Towertalk/2005-10/msg00176.html (7,617 bytes)
2. Re: [TowerTalk] Antenna problem? (score: 1): Author: "Saad Mahaini" <n5ff@comcast.net>; Date: Thu, 6 Oct 2005 10:56:09 -0500; what is the SWR of the radio into a known 50 Ohm Dummy load? --Original Message-- From: towertalk-bounces@contesting.com [mailto:towertalk-bounces@contesting.com] On Behalf Of K7LXC@aol.com Sent: Thu; /archives//html/Towertalk/2005-10/msg00177.html (8,305 bytes)
3. Re: [TowerTalk] Antenna problem? (score: 1): Author: "Rex Lint" <rex@lint.mv.com>; Date: Thu, 6 Oct 2005 11:57:15 -0400; Steve, Using good ol' logic, try a different transmitter, then perhaps fix the FT990? Rex, K1HI Rex Lint, Consultant 26 Brek Dr. Merrimack, NH 03054 PH: 603-860-7651 FAX: 603-882-6612 --Original Mess; /archives//html/Towertalk/2005-10/msg00178.html (9,241 bytes)
4. Re: [TowerTalk] Antenna problem? (score: 1): Author: Peter Chadwick <g3rzp@g3rzp.wanadoo.co.uk>; Date: Thu, 6 Oct 2005 17:58:39 +0200 (CEST); off. Add different lengths of RG-8, the swr varied from 2.5:1 to 5:1. It doesn't seem to be wx related. < I'd suspect common mode currents on the coax outer. Some ferrite rings or clip on sleeves, p; /archives//html/Towertalk/2005-10/msg00179.html (9,870 bytes)
5. Re: [TowerTalk] Antenna problem? (score: 1): Author: K7LXC@aol.com; Date: Thu, 6 Oct 2005 11:59:40 EDT; Don't know but other antennas - even other 15M ones - are fine. It's just a problem with this 15M antenna. That's the perplexing part. :-( Cheers, Steve K7LXC TOWER TECH _____________________________; /archives//html/Towertalk/2005-10/msg00180.html (7,753 bytes)
6. Re: [TowerTalk] Antenna problem? (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Thu, 6 Oct 2005 17:48:30 +0100; Something very similar happened here a few weeks ago, and it turned out to be a bad PL259. The center pin had become intermittently open-circuit when plugged into the jack at the end of the feedline,; /archives//html/Towertalk/2005-10/msg00187.html (9,824 bytes)
7. Re: [TowerTalk] Antenna problem? (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Thu, 06 Oct 2005 10:22:43 -0700; So, with the MFJ at the shack end of the coax, everything is fine, but the rig shows the bad SWR? Certainly, adding coax shouldn't change the SWR (at least that much) Is the problem power related? Pe; /archives//html/Towertalk/2005-10/msg00194.html (10,021 bytes)
8. Re: [TowerTalk] Antenna problem? (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Thu, 6 Oct 2005 17:41:48 -0400; 3:1. Antenna tuner was 2.5:1 to 5:1. It If you changed the length of cable and SWR changed it tells you the cable (towards the rig since it didn't change outside), meter, or connections are a proble; /archives//html/Towertalk/2005-10/msg00213.html (8,657 bytes)
9. Re: [TowerTalk] Antenna problem? (score: 1): Author: K7LXC@aol.com; Date: Thu, 6 Oct 2005 19:33:34 EDT; Howdy, TowerTalkians -- Thanks to everyone for their input - I got lots of comments. I went back to the site today and checked the antenna again. This time the swr was high and there was no dip anywh; /archives//html/Towertalk/2005-10/msg00222.html (8,115 bytes)
10. Re: [TowerTalk] Antenna problem? (score: 1): Author: Ian White G/GM3SEK <gm3sek@ifwtech.co.uk>; Date: Fri, 7 Oct 2005 07:37:18 +0100; In case this point was buried in my previous post, when SWR-testing the feedline and antenna, it's always a good idea to leave a 50R load connected in the shack. At each place where you break the fee; /archives//html/Towertalk/2005-10/msg00241.html (8,913 bytes)
11. Re: [TowerTalk] Antenna problem? (score: 1): Author: "John Wagner" <jwagner@dxengineering.com>; Date: Fri, 7 Oct 2005 08:37:00 -0400; If the SWR or the resonance of the antenna changes with feedline changes, you have common-mode current on the feedline. Ground are important as well. 73 John _________________________________________; /archives//html/Towertalk/2005-10/msg00254.html (11,042 bytes)
12. Re: [TowerTalk] Antenna problem? (score: 1): Author: "Tom Rauch" <w8ji@contesting.com>; Date: Fri, 7 Oct 2005 08:56:41 -0400; feedline changes, important as well. Actually it can mean three things John. 1.) The antenna impedance and SWR is actually changing because the feedline is part of the radiating system (feedline act; /archives//html/Towertalk/2005-10/msg00256.html (9,033 bytes)
13. Re: [TowerTalk] Antenna problem? (score: 1): Author: Jim Lux <jimlux@earthlink.net>; Date: Fri, 07 Oct 2005 10:02:23 -0700; And it doesn't have to be any high power load, either. A scrounged up 50 ohm BNC termination from a dismantled coax Ethernet installation would work fine. (but check to see if it's really 50 ohms). F; /archives//html/Towertalk/2005-10/msg00280.html (9,824 bytes)

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