"I am wondering about an alternative material. Such as thick wall electrical conduit (AKA EMP)" Forget the electrical conduit and fence posts. Go to your plumbing supply store and get a piece of 1 1/
First of all, 10 to 13 feet guy wire length, before adding the first insulator, would be absolutely the worst thing to do if you have a 15 meter antenna in the vicinity. Think about it - you have cre
The problem with this (and any) analysis of a lightning event is that it is FAR more induced >in any system (stuff wired together) will be different in each conductor depending on >WHERE the strike
A little more info... 51 of the trailers are located in Odessa, TX. 29 of the trailers are located in Pampa, TX. 73, Steve, N2IC _______________________________________________ ______________________
I disagree with this advice, Tim. Such a choke is strongly inductive below about 30 MHz, so > its common mode Z will be cancelled, at least in part, by the capacitance of a feedline > shorter than a
Call me ignorant, but I have a basic question.... What problem(s) are we attempting to solve with chokes on the 4-square feedlines ? Please answer in terms of actual impairments that can be discerned
Diversion of power to miscellaneous conductor paths is almost universally lossy and never in directions and modes desired in our attempts at directional arrays. The common mode path on the outside o
Interesting observation. Where does all that common mode energy go, if not into heat ? Does it get converted to useful RF power, or is it dissipated someplace else in the system ? 73, Steve, N2IC Oka
John, Most of the comments have assumed that your son has adequate space for a vertical. I have seen many terrible, limited space vertical installations, where the antenna is no more than a few feet
I picked up a roll of 3M Temflex for the first time. Frankly, I don't understand how to use it for antenna applications. It's just 3/4" wide rubber with no stickiness, and no plasticity. I would appr
Looks like this excellent tech tip from DX Engineering answers all question... https://static.dxengineering.com/global/images/chartsguides/t/tes-2155.pdf Steve, N2IC https://www.dxengineering.com/sea
My biggest concern and question: Could this damage the balun? The short answer is possibly. I had a similar situation a number of years ago. I was transmitting for a while on 160, using a 1/4 wave sl
Correcto mundo. In the years before the TIA-222, ham wisdom was that the foot long or so torque arms were a necessary part of tower construction. Turns out that they really didn't do anything for tow
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"Another promising LPDA design is the Band-Optimized LPDA by G0KSC of InnovAntennas. Theres an interview with him in the Jan/Feb NCJ. The article is fairly enlightening. The upshot is that its not ju
I am experimenting with the N4KG reverse feed method for 160 meters on a tower with a lot of stuff already on it. I like the possibility that elevated radials will be an improvement over my terrible,
The characteristics of the doorknob are unknown. It's a junk box special, with all of the lettering faded. Found an interesting article on the web by I0IJ on RF vs. HF capacitors. I'll have to try ex
Thanks to everyone for your suggestions on my 160 antenna heating issue. Yes, the problem was the single 2200 pf doorknob I was using. After replacing it with two 1000 pf doorknob's in parallel, all
If you have two identical baluns, you can match the phasing this way: - Connect a signal generator to a tee-connector. Connect each side of the tee to the input of each balun. - Connect the outputs o