[TowerTalk] Fw: ground radial project

[Steve Hunt]

Jim,

Agreed!

If folk would look carefully at the Brown/Lewis/Epstein paper they would 
see that it's not so different from Rudy Severn's work. Figure 30 in 
their paper plots received field strength against number of radials for 
a quarter-wave vertical radiator. Compared with the theoretical maximum, 
these are the shortfalls they measured:

15 radials: -2dB
30 radials: -1.3dB
60 radials: -0.7dB
113 radials: -0.2dB

To me that doesn't look like a strong case for 120 radials in Amateur 
Radio useage!

73,
Steve G3TXQ

On 14/01/2011 21:26, jimlux wrote:
> That 120 radial thing is from Brown, Lewis and Epstein, and was
> originally formulated as a FCC shortcut to avoid having to do a proof of
> performance on a non-directional AM transmitter (i.e. rather than spend
> the money to measure field strength on all the cardinal radials and so
> forth, you could say, we've installed the FCC standard ground field).