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Re: [TowerTalk] STACKING

 To: , "Jose Castillo" Re: [TowerTalk] STACKING "RICHARD BOYD" Sat, 7 Aug 2004 14:53:15 -0400
 ```As I often do, quoting others more expert than myself, the main issue seems to be detuning of the 15M yagi by the 40M yagi. I asked W3LPL how far a 15 and a 40 should be apart. He thought 30' would be good. Most of us would not be able to get that much distance and still have them both rotating on a mast at the top. One of them would either have to be sidemounted lower down the tower, or you have to accept the potential for degradation of performance by having them closer. In the real world, many people put their tribander and 2-el 40 within a few feet of each other and are satisfied with the performance. Obviously, more is better. While it's a different situation, different bands, I have 20 and 15 yagis 8' apart and they've always worked well. It's the interaction/degradation problem that causes people to pair 40/10 and 20/15 on two towers -- alternatively, 40/20 and 15/10. But not 40/15 together. With a tribander for 20/15/10 that's not the situation you have. 15 is the one that suffers, typically. Probably 6-8-10' separation between the tribander and 40 is worth a try and see if it works satisfactorily for you. The resonant point and/or pattern of the 15 may change. You might try putting up the tribander first and do good performance plots across each of the three bands. Then put up the 40 at whatever separation you can achieve and repeat the plots to see what effects you can observe. 73 - Rich, KE3Q ----- Original Message ----- From: "Jose Castillo" To: Sent: Thursday, August 05, 2004 7:54 PM Subject: [TowerTalk] STACKING > Hello, > I am planning on purchasing a SteppIR 4 element yagi. > I also have a Force 12 240/230 (2 ele on 40 and 30 meters) > > How high above the SteppIR would be adequate? > > 73 > Jose - N4BAA and YI9BAA > > _______________________________________________ > > See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless > Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with > any questions and ask for Sherman, W2FLA. > > _______________________________________________ > TowerTalk mailing list > TowerTalk@contesting.com > http://lists.contesting.com/mailman/listinfo/towertalk > _______________________________________________ See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA. _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
 Current Thread [TowerTalk] STACKING, Jose Castillo Re: [TowerTalk] STACKING, RICHARD BOYD <= Re: [TowerTalk] STACKING, Guy Olinger, K2AV Re: [TowerTalk] STACKING, Pete Smith Re: [TowerTalk] STACKING, Julio Peralta RE: [TowerTalk] STACKING, N2TK RE: [TowerTalk] STACKING, N2TK RE: [TowerTalk] STACKING, Dan Bookwalter RE: [TowerTalk] STACKING, N2TK RE: [TowerTalk] STACKING, Pete Smith Re: [TowerTalk] STACKING, kk9a Re: [TowerTalk] STACKING, Guy Olinger, K2AV