I'm glad you found something useful in the actual experience stories. ..."I see some of the self declared techie types are concerned about my motives for asking the question in the first place. So be
I hope you didn't want measured data. Here is an EZNEC comparison between (1) a vertical square loop on 40M fed at the center of the bottom wire, with the top wire at 70 ft, (2) a 2 element Yagi at 7
I forgot to mention, the loop fed on the side is almost omni-directional, within about 3.5 dB. The loop fed at the bottom has nulls in the direction of the plane of the loop of about 9 to 16 dB depen
Those numbers I gave don't include all those variables. Some of the variables like ground quality were included as a average value. Those last models do not include all the possible variables because
Also: There are some things that the software can't analyze. It can't handle an arbitrary terrain. It has only a very limited capability in this area. It can handle flat ground OK. Non-flat ground ca
I not sure exactly what antenna you are remembering, but there are several ways of optimizing rectangular loops. Here is one of my favorites for when you are very limited on height and want a 40 mete
You will need a space of about 1200 feet to build it and a method of accurately aiming it, 11.3 dBi gain, beamwidth 12.2 degrees. Jerry, K4SAV _______________________________________________ ________
..."Assuming you could efficiently match it and deliver power to it. Figure 3dB loss in that scheme, and you'd net out with 7 or 8 dB fwd gain, and a beamwidth which won't span europe. "... Could be.
After being disappointed in the direct burial method, I am planning on adding some conduit to access my low band receiving antennas. I have one section of conduit that is 500 feet. Can I do this with
Thanks for all the good ideas on pulling cables. I'm glad I asked. There were some good suggestions that I had never thought of. For the string, I have a shop vac and will try that. I can also add an
Don't believe everything you read in print. I just modeled an 80 meter version of that antenna, using the recommended dimensions, top wire at 31 ft and 65 ft long, with 82 ft of wire in the vertical
Here is one solution for matching that antenna to 50 ohms, and also moving it to the CW portion of the band. Make the top wire 88 ft long and reduce the amount of wire in the vertical portion to 56 f
Based on simulations I have done for similar situations, I would expect a lot of interaction with the roof. (I have done this simulation for a dipole over a 36 x 64 roof on 10 meters, and for vertica
What I find interesting is that Stepper of Italy introduced their version of the Ultrabeam before SteppIR introduced their version. How did they do that? Jerry, K4SAV ________________________________
I meant to say DreamBeam, not ultraBeam. _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.c
N2EA wrote: ...Points out lack of conductivity across rotors, and asserts 300-500V per meter above ground as the possible potential buildup. ... Did you mean across the balun, or between floating ele
K9YC wrote: "A current balun (common mode choke) has DC continuity ......" Some baluns built are like that. The subject starting this thread was the SteppIR balun. That is a 25 to 50 ohm balun which
N2TK wrote ...."Even without grounding the elements I can move the SWR on 160 all over the place with running the elements in and out on the MonstIR."..... That would agree with NEC simulation. Even
A quick check with EZNEC shows the following loss in the 30 feet of RG213. The antenna was placed at 40 feet. 3.5 MHz 2.17 dB 7 MHz 1.95 dB 10.1 MHz 4.42 dB 14 MHz 6.5 dB 18.1 MHz 2.28 dB 21 MHz 3.1
K8RI wrote: 6.5 sounds pretty high. Well it is. Seems there was a minor problem with the decimal point. It should have been 0.65 dB for 20 meters, not 6.5. I did notice that I used a 125 ft dipole in