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## Re: [TowerTalk] 160m inverted l

 To: , "Dale Martin" , Re: [TowerTalk] 160m inverted l "Chet Moore" Sat, 9 Dec 2006 16:57:27 -0500
 ```If it really is too short, stop cutting !!! chet ----- Original Message ----- From: "D. Scott MacKenzie" To: "Dale Martin" ; Sent: December 09, 2006 3:42 PM Subject: Re: [TowerTalk] 160m inverted l >I keep cutting and cutting - and it is still too short > > > -----Original Message----- > From: towertalk-bounces@contesting.com > [mailto:towertalk-bounces@contesting.com]On Behalf Of Dale Martin > Sent: Saturday, December 09, 2006 3:05 PM > To: towertalk@contesting.com > Subject: Re: [TowerTalk] 160m inverted l > > > > 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 > > _______________________________________________ > > > > _______________________________________________ > 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 Re: [TowerTalk] 160m inverted l, Mike Fatchett