Gull Winged raised radials cut to resonance seem to be excellent above ground radials- But I am in a small yard, and have my MA160V hooked up to radials going all over the yard, buried, of various lengths, 10-80 feet, about 60 of them- it only goes out in about a 100 degree pattern as the antenna is in the corner of the yard-they work as the resonance point and SWR bell curve really are effected when they are hooked up- 15KHz of usable bandwidth at a 4:1 SWR (matched with an UnUn to 1.5:1) vs 60KHz bandwidth without the radials at a 1:1.2 SWR, reflective of the hidden ground loss and impendence mismatch- - so even in a puny yard, with limited space, measured effect of buried radials can be significant.......too many dogs and kids for raised radials.......
Bryon "Paul" Veal MAED FCC Amateur Radio License-N0AH [email protected] Home Page at http://groups.yahoo.com/group/HamRadioPropagation/ > Date: Fri, 4 May 2012 18:34:31 -0700 > From: [email protected] > To: [email protected] > Subject: Re: Topband: Fwd: radals fer 160m vertcal > > On 5/4/2012 5:52 PM, James Rodenkirch wrote: > > What about radials above the ground? Like what I'm planning to install --- > > base of the vertical at around 5' to 6' above ground and slope all of the > > radials from that 5' or 6' point down to the ground? > > N6LF has published extensive work that he did on 40M showing that > radials elevated only a feet or so were quite effective, and that a foot > higher was better, but close to many radials on the ground. I tried > scaling this to 160M, placing radials at about 5 ft. They were NOT > particularly effective, and I had the chance to discuss the issue with > N6BT, who has studied elevated radial systems extensively on 160M. > Paraphrasing Tom, the earth at 160M is a rather different animal than it > is at 40M. Tom suggested that 16 ft was a better height for a few > elevated radials on160M, and I hope to move the ones on my experimental > antenna to that height in the next month or so, perhaps even before > leaving for Dayton. > > 73, Jim K9YC > _______________________________________________ > UR RST IS ... ... ..9 QSB QSB - hw? BK _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK
