Roy, I had a similar (but not so acute) problem and decided to sacrifice 12m; but that is very much a personal decision. 30 inches sounds very tight indeed. If...
Thanks to K4KIO Leo for his help. The simple answer is my spreaders are 5-6 inches too short. They need to be at least 120 inches (as is clearly stated on...
I've uploaded 3 pictures into an album named "AC2C HexBeam #2". My first HexBeam was built a year ago following instructions from Leo, K4KIO. I constructed it...
Ron, Nice job! From the photos it's clear that the increased spreader length has produced a significantly "steeper" angle close to the base plate. I'll be very...
Steve -- I gave the spreaders a "head start" slope at the base plate by building in a 5 degree angle to the spreader mounts. I followed Leo's measurements to...
That will not give an accurate measurement of the SWR unfortunately. SWR could be measured correctly at the feed-point or with a 1/4 wave velocity factor ...
Mike -- Many thanks for the advice and the interest in the project. I'll be the first to admit that I've never completely grasped the concept of RF radiation,...
Ron: A few comments. With your spreaders 134 inches long, and pulling the circumference of the hexbeam to conform to 120 inches between the ends of the...
Leo -- That was the primary goal -- to increase vertical space. I initially just set the elements within the strucutre to get a feel for how they'd come out....
Ron, Mike is right to point out that the length of feeder will modify the antenna's complex impedance as measured on your MFJ analyser; however it will NOT...
Steve -- The MFJ Analyzer that I used last year was borrowed and is no longer available to me. The only instrument I have is the SWR meter built into the...
OK Ron, I look forward to seeing the SWR numbers. I wonder if at some stage during the build you will be able to measure the SWR of each band fed in isolation...
Steve -- It would seem that the only really practical way that I could do that would be to take measurements BEFORE mounting atop the mast. Would it be helpful...
Ron, Yes, that would be helpful. The monoband measurements give a more accurate fix on the frequency of best F/B, even though there will then be a slight shift...
Hi, my name is Ray and I am researching the plans for a multi band quad- beam. has anybody been successful when using pvc? will it hold up for a long time or...
Hi Ray - Yes, they do " warp " and take a set, which takes the tension off the wires, which then sag really bad. I constructed a 3 band Hex using 1" gray ...
Thanx Harold for the good advice, I did see someone post info about fiberglass animal fence posts. I looked at a couple of fence sites and they seem reasonably...
Hi Ray, It is Duport Corian and is rather heavy. I have some left in my garage to make shelving (removed from kitchen to replace with granite to make XYL...
Howdy, Managed to break a spreader on subject antenna. It took some work to do. Has something to do with a misbehaving Yeasu 450 rotor, a foldover tower, the...
Hello All, I am new to amateur radio and I have recenly "heard" a lot of great things regarding the hex beam. Just yesterday, I was listening on 20 meters and...
Ray, If you do start building your project and would like help I live in south Sac and would be willing to help you. I haven't built one yet but this could be...
Folks, Fot those who may not yet have seen the arrangement, I've added a photo to my album showing the method used on the SpiderBeam to connect the spreaders...
Just wondering if this has been done before; anyone successfully mounted a vertical (like an MA5V) on top of one of the hex beams? I have the HXL-20...
Steve I am sure that you know that that base plate is the same one used for the Spider Beam. I have one and have had trouble with the beam Turing around the...
Gene, Thanks for the "first hand" input - it's useful to know the SpiderBeam suffers that way. I guess I was particularly interested in the way they use the ...
Steve writes... ... I'm curious as to how much lateral loading there will be on a hex-beam once it's together. It would seem to me that a 5-band hex-beam has ...
Rick: I've not seen your idea discussed by anyone else and it sounds feasible to me. I would think you can deal with the lateral stress by stringing dacron ...
Gene, Seems to me to be a simple matter to secure the mast to the plate in this case (Spider Beam or HEx-Beam variant). Why not drill a hole through the clamp...
Hi All, Finally, as of today July 12th, Italian Amateur Radio operators will be roaming around the 70 MHz band, although for a limited experimental period and...
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