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## Re: [TowerTalk] 160m inverted l

 To: Re: [TowerTalk] 160m inverted l "Dale Martin" Sat, 9 Dec 2006 14:05:08 -0600
 ``` If you've got an antenna analyzer like the MFJ-359, you can see where the SWR is minimum. Cut off a few inches of antenna. See where the new minimum SWR point is. Then you can figure how many kHz per inch the minimum SWR point will move with each subsequent cut. For instance, cut off 6 inches of antenna and find the minimum SWR moves from 1818 to 1824. So, the kHz per inch is 1 kHz per inch. If you take off six more inches, the minimum SWR moves to 1830, or 10 inches to move to 1834, etc. Of course, it pays to be conservative when your are cutting wires, so always cut for a lower frequency than the actual target until you get with a couple of inches. For my 1/4-wave half-sloper on 80, instead of cutting the wire to move it into the phone band, I simply bring the antenna end back on itself to shorten the overall antenna. I use the same method of calculating how much will move how far, but without cutting the wire. :-) 73, Dale, kg5u > > > John: > > > > Start out with about 130 feet of wire and trim about > six inches at a > > time until you get the min SWR where you want it in the > band, usually > > around > > 1830 kHz or so. You should end up with something around > 123 feet of > > length > > but that depends on the usual antenna things like > everything else that's > > around the antenna, etc. . > > > > 73 de > > Gene Smar AD3F > > > > > > ----- Original Message ----- > > From: > > To: > > Sent: Friday, December 08, 2006 9:27 AM > > Subject: [TowerTalk] 160m inverted l > > > > > >> I am trying to figure the length of inverted l using #12 > insulated wire. > >> I > >> come up with 120 ft is this right? > >> > ______________________________________________________________ > __________ > >> Check Out the new free AIM(R) Mail -- 2 GB of storage and > >> industry-leading > >> spam and email virus protection. > >> _______________________________________________ > >> > >> > >> > >> _______________________________________________ > >> TowerTalk mailing list > >> TowerTalk@contesting.com > >> http://lists.contesting.com/mailman/listinfo/towertalk > > > > _______________________________________________ > > > > > > > > _______________________________________________ > > TowerTalk mailing list > > TowerTalk@contesting.com > > http://lists.contesting.com/mailman/listinfo/towertalk > > _______________________________________________ > > > > _______________________________________________ > TowerTalk mailing list > TowerTalk@contesting.com > http://lists.contesting.com/mailman/listinfo/towertalk > _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
 Current Thread [TowerTalk] 160m inverted l, ny6dx Re: [TowerTalk] 160m inverted l, ersmar Re: [TowerTalk] 160m inverted l, Jerry Keller Re: [TowerTalk] 160m inverted l, Dale Martin <= Re: [TowerTalk] 160m inverted l, D. Scott MacKenzie Re: [TowerTalk] 160m inverted l, Chet Moore Re: [TowerTalk] 160m inverted l, David Gilbert Re: [TowerTalk] 160m inverted l, Jim Miller Re: [TowerTalk] 160m inverted l, Chet Moore Re: [TowerTalk] 160m inverted l, Dale Martin Re: [TowerTalk] 160m inverted l, K4SAV Re: [TowerTalk] 160m inverted l, Jim Miller Re: [TowerTalk] 160m inverted l, Tom Osborne Re: [TowerTalk] 160m inverted l, Terry Conboy