I better quit this before I draw flames. 73 de Red _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http
Contributors report differing experiences regarding deterioration of various wires used as radials. Don't forget, soil chemistry has a lot to do with whether a particular kind of wire survives for a
I observed similar degradation of bolts in a tower that stood in a metropolitan area for about 10 years. The center portion of the bolts was substantially reduced in diameter, though the sections sup
The inductor core in the ICE suppressor saturates due to the low frequency components of a surge and becomes a short circuit, thus relieving the gas tube of much of the current. That can happen befor
We never know who may be reading our posts. I'd be embarrassed if something I wrote to the list was read by my boss, my minister, my mother, or any other person I respect or love and was offensive to
HI, Doug; Perhaps a freestanding tower will survive better among trees than a guyed tower. The trees will shelter it a bit from lower level wind, and trimming or removing only the trees that threaten
Hi, TTers; Al Williams's analysis is correct. Rick's added note on using a jack to start the tilt and to catch the tower when raising is a good idea. If not restrained, it can land pretty hard. I hav
I built a few telescoping verticals with one section each of 3" and 2" irrigation pipe. I made aluminum bushings to fit the 2" inside the 3" and permit them to telescope for transport and to adjust l
Hi, Gary; I machined them from a piece of 3" OD 1/2" wall aluminum I found at a scrap yard. Just got lucky! I have a small lathe and removed a few thousandths from the ID for bushings at the top of t
Hi, Gary; The coupling between a 2" OD and a 2.9" ID (the two pipes) is 46 picoFarads per foot. Guess we better put in the aluminum connections. The reactance of 46 pF is 124 Ohms at 28 MHz and 870 O
Hello, Tonno; The radials under a vertical carry a percentage of the image of current of the vertical element and should extend from the bottom of that vertical element. Each member of a phased array
Hello TTs; I purchased a copy of the Champion Radio report on verticals a few years ago and found it quite informative, both as to the many considerations of how to test and as to the test results. I
Maybe lighting makes a difference. I wonder if strobe lights and red flashing lights affect some birds differently. Perhaps fog, haze, or other reflective particles in the air make a difference, too.
We find that a lowered venetian blind, even though open, deters cardinals and robins form attacking their reflections in the windows. They may also stop collisions as other birds try to fly through t
HI, Tom; Are you using one of the typical TEE network tuners? They are typically high pass filters (two series capacitors and a shunt inductor) and may attenuate an AM broadcast signal when tuned to
Caig laboratories offers several products and their web page offers lots of information abut the products and their uses. See http://store.caig.com/s.nl/sc.1/.f Can anyone offer any experience, names
Thank you, Van, for sharing your experience and the info. I agree, too, with removing contaminants mechanically and with use of evaporating solvents such as water, alcohol, and acetone for cleaning,
That use of linseed oil may have been suggested by the practice of protecting steel tubing used in aircraft with linseed oil. However, that application involved welding shut the tube after placing a
Dear TTs; I'm sure there is a limit to how much coax may hang from one point on the coax, before the weight or wind overstresses the coax and either breaks it or alters its characteristics. I expect
Many thanks, Jim; Your calculations and experience appear quite conclusive. We don't need to worry too much about the weight of common coax overloading the tensile strength when it is supported at a