Antifouling paint would be a rather bad choice for insulators ... it's loaded with metal particles, usually copper. http://www.answers.com/topic/antifouling-paints 73, Dave AB7E _____________________
Kip, It's clear that you're a lot smarter than your engineer. If he works for you, hopefully (for your sake) he's a not an electrical engineer. 73, Dave AB7E _________________________________________
Hi, Stan. How about adding some "spikes" (like a capacity hat) to the end of the boom to add capacitive loading? 73, Dave AB7E _______________________________________________ ________________________
Concrete actually >cures< faster when damp. Concrete needs water to form the chemical reaction that gives it strength, and without moisture present it merely dries out. 73, Dave AB7E ________________
That's probably true for large volumes of concrete like a tower foundation, and I stand corrected. It is NOT necessarily true for smaller volumes of concrete, especially here in Arizona, where the co
I should have said "dry out before it has cured to spec". 73, Dave AB7E _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTal
You can get a decent estimate of what the potential benefit would be by using HFTA, the free application that is included with any recent copy of the ARRL Antenna Book. I have no idea what your terra
HFTA has a known issue with overstating gain for close spacings, so it is best to rely on generally accepted practice for setting spacing unless you can actually model the antennas with a program lik
That video is the poster child for bad manufacturing practices, and it is no wonder they have the product quality problems they do. It isn't a function of them being small, or being home grown ... it
In my particular case, it's not hostility ... it's resentment. If every U.S. company, large or small, cared as little about producing a quality product as does MFJ there wouldn't be anyone left here
I don't have the schematic for that tuner handy, but assuming it is a T-Network the most efficient setting will probably be the one where either the input or the output capacitance is closest to maxi
I think in general that the lowest loss would occur with the lowest current through the inductor ... I'm not sure that always equates to the lowest inductance. Whether the maximum capacity should be
You're getting your tail feathers in a knot for no good reason. 1. I'll bet very few of your wire antennas fit the class of antennas Rick described. 2. What's your point about a receiver? 20db down f
I think there is danger in generalizing. I live in very rocky terrain (check out my tower installation pics at ab7e.com) and if I'm lucky I can get about 75% of four foot rods to go in all the way no
Where I live, even Bosch hammer drills driving Bosch drill bits have a hard time getting through the blue granite rocks that abound here. I've watched it in action. Dave AB7E ________________________
Who said bolted joints between tower sections were electrically unreliable? They generally have large surface area, handle a LOT of current, are usually of the same metal, and are held together with
That's why when I use TLW I initially specify large value capacitors so I can see what's going on first. I do the same thing with the W9CF online tuner app. I don't think there are many cases for an
That is not a idle consideration. About 40 years ago my then wife and I were relocating to a new QTH with all of our belongings packed into an overloaded U-Haul trailer being towed by our car. At one
I'm certainly no expert, but I've been on a lot of ladders (some pretty tall) and I strongly suspect that the only effect of being tied off to the ladder is that if I slipped it would come down with
Don, that's not really true if the radials are elevated, in which case they may be more accurately thought of as a tuned counterpoise. Build a model in EZNEC if you don't believe me. To answer Bill's