Topband: Elevated Radials EPILOGUE
zr at jeremy.mv.com
Thu Mar 7 12:09:16 EST 2013
ON4UN's series of books have always had way too many individual assumptions
and we all know what happens then.
Those books offer a place to start and then apply your own unique soil and
local conditions and change as needed.
----- Original Message -----
From: "Buck wh7dx" <wh7dx at hawaii.rr.com>
To: <topband at contesting.com>
Sent: Wednesday, March 06, 2013 3:42 PM
Subject: Re: Topband: Elevated Radials EPILOGUE
> There is some good stuff in ON4UN Low Band Book - Chapter 9-10 on
> Elevated Radials.
> He suggests that an elevated system would be even better above ground
> versus on the ground in poor conditions. References 0.1 wave height or
> less. For 160m that could be 50 feet down. In Section 2.2.7 K3LC says
> that there is no point in raising radials any higher than 6 meters on 160
> or 3 meters on 80 meters. Such a height would be between 0.2db of what
> can be achieved with 64 buried radials... N7CL says they need to be
> The perfect on ground system might be 50-100 1/4 wave ground radials...
> In 2.1.2 he warns of trusting modeling because of outside factors.
> 9-12 Figure 9-18 (modeling) regarding 160m gain using 1/4 wave is
> interesting over average ground. If you wanted max. it suggests using
> 120 - 80meter radials. But the difference between 120 (1.5 dbi gain) and
> going with 32 (1.0 dbi gain) would make one wonder if it was really worth
> it for another 1-2 miles of wire.. work? 0.5 dbi gain?
> The Conclusion in 9-14 is interesting.. basically saying..
> "Take the example of an 80-meter vertical over average ground: going from
> a lousy eight 20-meter long radials to 120 radials would only buy you
> 1.4db of gain, which is less than what I think it is in reality. In very
> good ground that difference wold be only 0.7 db!"
> 184.108.40.206 - "From these almost 70-year old studies, we can conclude that 60
> quarter-wave long radials is a cost effective optimal solution for amateur
> K3NA's work in 220.127.116.11 talks about using 1/16 wave radials.. not going
> beyond 48.. but that doesn't match up with N6BV's work several years
> In 2.2 Elevated Radial and beyond it's gets really interesting and less
> The Conclusion States - "If you want to play it extra safe, and if you
> have the tower height, get the radials up as high as possible and add a
> few more. Use a ground screen if you have it.
> "It all is very logical. Get away from the lossy ground or hide the lossy
> ground with a dense screen using many radials. No free lunch!".....
> This was one book and it goes on.....
> All of this sounds like a great episode for Ham Radio Myth Busters.......
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