Certainly true that the coax VF is part of the tuned network, however... There are two possible issues going on here: While you may adjust by the ratio of the velocity factor to get the inside-the-co
Tuning it down to nothing does not necessarily mean better performance. For some of the tuners, particularly some of the smaller ones, no reflected power means that the swr is going out in the form o
When I moved from Va to NY, I couldn't get mine out either. Just depends on the dirt and the local topography. If it turns into a sea of mud every spring and the place doesn't drain well, depending o
Antenna efficiency is reduced by power lost to heat radiation, either from conductor resistance or dielectric loss in nonconducting components of the antenna. Antenna SYSTEM efficiency, as read, need
Probably not, because 12 feet is definitely near field for 20 meters, and for each of the antennas the boom of the other would be a major conductor no farther away from the driven element than the fo
I think you're a little off on this one, Steve. In construction of all concrete framed buildings, pours separated by weeks and having rebar in common are all over the place, and have to be. They occu
Bite your tongue. That book is a bunch more "real info" than some manufacturers want you to see. One manufacturer, seeing the cruel facts about how poorly theirs stacked up, published a pitiful obfus
And spend the time to type the study data into very long email, for the same question asked over and over? How many times has someone asked the question on TT about how tribander A compares with trib
I find that story quite remarkable. More detail about the failure? Which antenna, mode of failure, ice or wind involved, etc? My personal experience with F12 products has been excellent, especially w
A direct lightning strike with the voltages to jump from the sky to ground will ignore small irritations like a dipole center insulator. I have seen the wire vaporized with nothing (including the cen
Egads, it boggles my mind that people don't know how to do this... Go to http://www.contesting.com with your browser. In the panel on the left, down a little ways, is an entry box "List Search". Type
Bowline never came loose on me even once in my life. Never heard of such. Never read of such. Once tension is on them, takes a little doing to get them loose. Towertalk has the distinction of carryin
1. This antenna is one of the all time classics. Strictly speaking what you call the main radiator is really TWO items. The radiation essentially gets done by the part of the piece which has nothing
Better to wind up with a fair price than be snookered (intentionally or unintentionally) by someone because you're afraid you might hurt their feelings. A useful phrase is, "Nothing personal, but I'm
A collection of short answers... There is almost no feedline around that will be lossy enough healthy to "broaden" the apparent SWR of an antenna on 1.8 MHZ, aside from damp string or saltwater in a
Particularly the older Phelps-Dodge, the adage is, if it ain't broke don't fix it. The real weak point is the coax to the antenna, and the coax connection at the base not being sealed properly. Are t
This didn't seem to happen that much out east (got one from the factory like that once), but then most places we don't have anything like the recurring high winds seen in the west. This trouble or th
A 20m eight element wire yagi on 168' catenary (true wide spaced) fixed on EU is far narrower than anything below. In combination with a higher 4 el swung 350 for JA, UA9, UA0, it covers very well. T