Those of us who have worked in broadcasting know that most AM broadcasters use a heavy copper mesh (typically 40' - 64' square) surrounding the base of a tower, with radials connected at the perimete
I got the idea of the mesh at work from a Tech Class engineer but dont remember him referencing HRM. This was in the mid 80's and I was complaining about the poor performance of a shunt fed 100' towe
Rob Sherwood was once a strong advocate of chicken wire and has run many tests. Perhaps he might chime in here with some comments. Howard K2HK _______________________________________________ UR RST I
Rob is NC0B. I cited his work in my first post on this. 73, Jim K9YC _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
tests. Perhaps he might chime in here with some comments. Rob is NC0B. I cited his work in my first post on this. 73, Jim K9YC _______________________________________________ UR RST IS ... ... ..9 QS
I didn't mean to imply that chicken wire is as good as the rabbit wire. In fact I had exactly that situation with chicken wire. Definitely agree that most situations must be evaluated on their own me
Some rabbit wire sold here is coated which should solve some of the corrosion problems but if they are laid side by side they probably would require scraping of the coat and welding every five feet o
Just to note that Edmund Laport (once the Chief Engineer of RCA International) did not support the use of ground screens in his textbook RADIO ANTENNA ENGINEERING (page 121), citing eddy current loss
The FCC only suggests screens with voltage-fed antennas. The exact text is: (4) At the present development of the art, it is considered that where a vertical radiator is employed with its base on the
I've used screens when I needed a wide bandwidth ground system, but never under other conditions. Adding a screen or preferably, additional short radials at the base will assist in stabilizing the re
Im sure chicken wire lasts longer in the great southwest but it rapidly turns to rust in the acidic soil and acid rain of the New England rust belt. I see rolls of it regularly at our trash transfer
I've used screens when I needed a wide bandwidth ground system, but never under other conditions. Adding a screen or preferably, additional short radials at the base will assist in stabilizing the re
Rudy's latest article on small vertical efficiency for 600M, published this July, is very timely and reinforces some of the discussions we've had. Read and enjoy! _http://rudys.typepad.com/files/600m