Sounds like your cover was installed upside down. I checked mine, and it has two holes on the bottom, no holes on the top. Jerry, K4SAV _______________________________________________ See: http://www
Does anyone have a good test method to determine the resonant point(s) of a tower structure? The system is sufficiently complex that I don't think I can ever get an accurate model for simulation and
There are several of these receiving antennas all in the same class, EWE, flag, pennant, K9AY. They all work. W8JI has an article on his site that compares the parameters of different types of receiv
I was enjoying all this brain storming to see if anyone could figure out how to string this cable, but I was also wondering how long it would take before someone asked how this thing was going to per
OK, I guess I have to eat crow again. My simulation of this antenna had an unintended load in it, due to using an old model file, which I didn't inspect closely. This is a pretty good antenna. On 160
An update on the 800 meter long wire performance. Using 17 ga aluminum wire vs 0.5 inch galvanized cable I had first assumed, decreases the gain by about 3.7 dB. The antenna pattern is very sensitive
Thanks for the suggestion, but I couldn't find that article. It wasn't listed in the QST index search, which covers Ham Radio, QST, and QEX. Maybe some other magazine. The ARRL Antenna Book 20th edit
The gain decrease is because of wire surface area. Conductivity of aluminum is actually less than zinc, but the surface area of a #17 wire is much smaller than the surface area of a 1/2 inch diameter
Is it "written" someplace that he has to use the entire span for the active antenna??? No, but I have already tried reducing wire length to see if this was a possiblity. A shorter wire results in les
Hmm.. This is hard since you didn't say if you have any other supports or room for wires. First, feeding the tower is going to be hard without insulating the guys. If you add vertical wire antennas c
It's not your antenna wire. You don't have the right kind of balun(s). You have two requirements for the antenna, You have to match the antenna impedance and you have to take care of the feedline cur
You can configure a 4 to 1 current mode balun using two physically separated cores. There is an example in ARRL Antenna Handbook 20th edition page 26-24. Seems like you should be able to buy these al
I can't imagine that these towers require support at both ends and the middle. These things are designed to be raised by fixture that attaches a cable at about seven feet up, and then the whole thing
If you are planning to have a tower, when a backhoe shows up, have him dig the hole for your tower. Since he is already there, you should get a good deal. I paid less than $50 for my hole doing it th
I knew that didn't sound right after I saw it in print. Dyslexia, I guess. It was $58/yd. Jerry, K4SAV _______________________________________________ See: http://www.mscomputer.com for "Self Support
Instead of tearing into your antenna tomorrow, take the day off. It appears that you have the AEA VIA Analyst set to 75 ohm reference instead of 50 ohms. Your plots show a resistance of about 43 ohms
I'm with the old school who calls a center fed antenna a dipole, and a Zepp the same thing they used on Zepplins, and there is no such thing as a center fed Zepp. Since I don't claim to be up on all
Bob When I looked at your charts, I see an impedance curve hitting about 43 ohms at 1.8 Mhz (close as I can read it) and the reactance curve shows a transition at this point, so this is just 43 ohms
Well, sure we are making too much fuss over these names, but I have idle time on my hands. <grin> Earlier I went searching for the current usage of the term center fed zepp. I guess I should have sai
Steve, It's difficult to get a 40M dipole to have an SWR of 2 to 1. If you have perfect ground and the antenna is at 15.5 ft the SWR should be about 2:1. Lower heights raise the SWR, and poorer groun