View Single Post
  #37   Report Post  
Old July 25th 06, 06:03 PM posted to rec.radio.amateur.antenna
Richard Fry Richard Fry is offline
external usenet poster
 
First recorded activity by RadioBanter: Jun 2006
Posts: 440
Default Radial attenuation

"Walter Maxwell" wrote
... I now quote again from BLE:
"Fig. 6 shows the actual current in the earth for the same conditions.
These
diagrams show that the ground system consisting of only 15 radial wires
need not
be more than 0.1 wavelength long, while the system consisting of 113
radials is
still effective out to 0.5 wavelength."

Does this not agree with Reg's Radials3? If not, please tell me what I'm
missing. (I do not have Radials3, and am only commenting from what I've
read in
the various posts.)

___________

Possibly not. Here is a paste of one the early responses to the first
thread started by Reg on this subject , which shows that with radials_3,
radiation efficiency doesn't just stop improving with longer radials, it can
also get worse.

QUOTE

Reg, a bit confused by these results from RADIAL_3

96 radials, 7MHz, antenna height 10.72m. Soil 500ohm*m, permittivity
13\

Radials and antenna 1.024mm (18AWG), radials 3mm deep(surface)

Radial Length, %Efficiency

2m, 93.19%
3m, 93.83%
4m, 92.47%
5m, 86.01%
6m, 80.39%
7m, 85.92%
8m, 89.06%
9m, 89.59%
10m, 88.22%
11m, 85.99%
12m, 85.51%
13m, 86.67%

??

Dan

END QUOTE

/RF