View Single Post
  #15   Report Post  
Old January 5th 09, 12:24 PM posted to rec.radio.amateur.antenna
Cecil Moore[_2_] Cecil Moore[_2_] is offline
external usenet poster
 
First recorded activity by RadioBanter: Mar 2007
Posts: 3,521
Default The $1000 Power Measurement Challenge

Art Unwin wrote:
'I see no discontinuety at the ends of the antenna so the law on
discontinuity does not apply..
I do see a discontinuity in a transmission line so the laws on
discontinuity do apply..


A #14 horizontal wire 30 feet above ground is a "single-
wire above-ground transmission line" line with a
Z0 = 138*log(4D/d) = 600 ohms where 'd' is the diameter
of the wire and 'D' is the height above ground. The ground
is the other half of the transmission line.
--
73, Cecil http://www.w5dxp.com