This link http://www.commtechrf.com/documents/nab1995.pdf leads to a paper by Clarence Beverage with some real-world results for monopoles with elevated wires used as a counterpoise. Here is a quote
As Richard points out, the surface wave plot in 4Nec2 is a key analytical tool when focusing in on what's happening at very low elevation angles. Otherwise, when only observing the elevation profile
Keep in mind this Sole purpose of a BC station is to get coverage of about 60 miles running 5KW day time and 1 KW night time with no fad and quality signal not to work DX. I read in some posts or on
There have been several reports of established AM stations that the FCC gave permission to replace a decayed or destroyed inground radial system with elevated radials or an elevated mesh/radial arran
Dick, thanks very much for posting the link for the Beverage elevated counterpoise article. Very interesting reading. Also thanks for the surface wave vs skywave graphic. 73 Chas N8RR _______________
The FCC requires minimum "efficiencies" for the radiators of various classes of licensed AM broadcast stations, expressed as the r.m.s. field intensity of the ground wave produced at 1 km for 1 kW of
Thank you, Richard, fore passing the paper on....looks like I won't "suffer" by having elevated radials in the least. Jim R. K9JWV _______________________________________________ UR RST IS ... ... ..
Thanks for the wisdom, Rich. :-) However, I've always wondered about the following statement. My question is, on what amateur bands is this common? And on what amateur bands is this possible? 73, Mik
RE: Mike Waters asks: It is universally common for the highest radiated fields launched by vertical monopoles to occur in the elevation sector between the horizontal plane and 5 degrees above the hor
Ive copied US BCB stations as far inland as Chicago in the far eastern Meditaranean. Id be curious what the propagation mode was and if sky wave how many hops? I also regularly hear the LF BCB statio
Carl KM1H wrote [sic]: It certainly wasn't by their ground/surface wave, but their skywave. As to how many hops that took, please note that it would take fewer hops to produce a useful field intensit
While another theory holds that at a common grayline on some paths it is more likely that a high angle lobe enters a duct of some kind and exits at the far end _______________________________________
This really depends on how good the ground system below the vertical is. If you have an exceptionally good ground system, you can get those 5 degree takeoff angles. More typical for ham radio setups
One workaround is to use some other software for plotting. I've used GNU Octave and EZNEC's near field table to make plots of the total field at finite distances: http://n3ox.net/files/nfpatt.png I'