LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #6   Report Post  
Old June 20th 05, 04:54 PM
Richard Clark
 
Posts: n/a
Default

Well Reg,

After years of harping on about your lack of a method, you rummage
this up:

On Mon, 20 Jun 2005 10:49:54 +0000 (UTC), "Reg Edwards"
wrote:
....
13. I have made HF measurements in other shaped containers, usually
smaller and plastic, with copper sheets for electrodes. Also in the
garden itself between radials and arrays of relatively short rods.
Any sort of measurements are more useful than none.


I don't see you asking Walt for his data to CONFIRM your method. I
don't see you doing any where near Walt's effort in building a sample
matrix of your own to test against your method to CONFIRM your method.
Validation seems to be an orphan in this discussion.

Some people say the only way to deternine soil characteristics is to
construct a 1/4-wave vertical antenna, feed it with 50 Kwatt at 500
KHz and measure field strength at 1 mile intervals for 100 miles. And
then do some calculations. Don't you believe it!


Bosh! Some people indeed. Your biology instruction in the British
school system apparently didn't teach you the difference between
people and straw-men.

The veiled suggestion of a result
10. Using classical transmission line formulae in reverse, the values
of line conductance G, capacitance C and hence permittivity K of the
"insulating" material, i.e., the soil, can be calculated.

is representative of an extremely thin veneer, ignoring the bulk that
is so easily found by using the antenna in situ - the method you
dismiss as unbelievable, and what is experienced every day by
absolutely every Amateur on "Earth."

Reg, it was a nicely scripted recipe. It contains well explained
methods. It attends practical issues of measurement. However, it
wholly lacks common sense when you reject what is already observable.
What you offer is minutia of an old wife's tale.

For method, any existing antenna's free-space characteristics is far
better understood and revealed through a model than what you offer.
And that antenna's free space Z characteristics compared against
measured in situ Z performance yield the solution of what contribution
local earth has to offer. Single point measurement of contaminated
soil samples has as little chance of doing the same as trying to
measure the ocean's capacity with a teaspoon.

73's
Richard Clark, KB7QHC
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules

Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
What tool to measure SWR at 910 Mhz? [email protected] Antenna 14 May 10th 05 06:40 PM
Can you measure and post your DTMF Twist? Rick General 0 April 4th 05 06:57 AM
Measure Z with Vector Voltmeter properly The other John Smith Antenna 18 May 3rd 04 05:09 PM
Ground rods in rocky soil Northern Lights Antenna 15 November 22nd 03 08:14 AM
SWR will change with Source Z if you measure AT the Source Tarmo Tammaru Antenna 18 August 30th 03 03:18 AM


All times are GMT +1. The time now is 04:38 AM.

Powered by vBulletin® Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Copyright ©2004-2025 RadioBanter.
The comments are property of their posters.
 

About Us

"It's about Radio"

 

Copyright © 2017