Hi All...I'm having a hell of a time trying to match a pair of 40 meter M2 4 ele beams..both antennas have 1.5 swr or less at 7.150..high or low..switching to both it goes up to 2.1 swr..I'm using a
I'm not using any core, just bring the two of them to a box that lets me pick each one separately or just parallels them directly... bring that back to the shack and go through an mt-3000 to shift th
Sounds about right. If the impedance at the shack end of the coax is 50 ohms for each, then in parallel, that's 25 ohms = 2:1. You can compensate in many different ways, or course, but the easiest is
I donīt agree. The stack match is a more complicated and expensive way to do the matching. The easiest, less expensivest and imho best methode is series matching. http://www.seed-solutions.com/gregor
The simplest version is a single 1/4 wave section that is added in when 3 or more yagis are paralleled... been using that here for years, add one jumper to an rcs8-v relay box and use 1n4001 diodes t
Hi All...I'm having a hell of a time trying to match a pair of 40 meter M2 4 ele beams..both antennas have 1.5 swr or less at 7.150..high or low..switching to both it goes up to 2.1 swr..I'm using a
After hundreds of recent tests, the BOP mode is a dud for the most part. Even when listening to these daytime 40m nets, BIP is louder than BOP ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Author: "David J. Sourdis - HK1A" <hk1kxa@hotmail.com>
Date: Mon, 22 Nov 2010 11:56:07 -0500
Not as elegant nor as good like the ones exposed before but this is a poor man's, or emergency, stack match. Needed: Two antenna selector switches with two antenna ports One antenna switch with three
What ever happened to the good old (and simple) 2:1 unun which can be set up to give BIP, TO, or BO. with 4x SPST (QST, Feb 1994, p43) or 3x SPDT relays? In a contest I like to leave the lower on the
I installed a StackmatchII+ a week ago on my 40m beams at 160' and 75' and I tested it out thoroughly during the Sweepstakes contest this weekend. In nearly all cases, BIP was better than BOP so I ra
I use a Stackmatch to feed dissimilar antennas in order to spray RF in two directions. For example, during this past Sweepstakes, I fed a tribander at 60' pointed NW along with a different type of tr
Sometimes it helps to use BOP when the station you want to work is off the back and there is a strong signal in the front of the stack. Not worth the effort though imho. Chuck W5PR __________________
What do you find BOP useful for - DX or only domestic contacts? My results with BOP have been quite different. On all bands from 10-40 I incorporated BIP/BOP/TOP/BOT and found the BOP quite useful. P
I use a Stackmatch to feed dissimilar antennas in order to spray RF in two directions. For example, during this past Sweepstakes, I fed a tribander at 60' pointed NW along with a different type of tr
and I tested it out thoroughly during the Sweepstakes contest this weekend. In nearly all cases, BIP was better than BOP so I rarely used BOP. QSL that. If you've ever seen Bob Heil's presentation on
and I tested it out thoroughly during the Sweepstakes contest this weekend. In nearly all cases, BIP was better than BOP so I rarely used BOP. QSL that. If you've ever seen Bob Heil's presentation on
I believe you are correct about HFTA, Jim. From the HFTA manual: "The internal Yagi model in HFTA is a simple mathematical model. It does not compute interactions between individual Yagis in a stack-
Agreed if both antennas are always aimed together, but if they can be pointed in different directions, you still need top-bottom-both switching. 73, -Steve K8LX ______________________________________
Dean has made it clear that he uses a simple isotropic source of the specified gain. Realize that the use of an isotropic source (e.g. no F/S in the vertical plane) also effects the final pattern by