LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #9   Report Post  
Old March 17th 06, 04:40 PM posted to rec.radio.amateur.antenna
Cecil Moore
 
Posts: n/a
Default Current through coils


"Gene Fuller" wrote:
I never in my wildest dreams said anything about Tom's measurements.


Of course not and I certainly didn't mean to imply otherwise. What
you said was *objective and impersonal*, applicapable to anyone's
measurements and also applies directly to Tom's earlier measurements.

I don't believe that Tom set up a simple standing wave antenna and then
tried to measure the phase of the standing wave.


Maybe we should ask him. As I understand it, both Tom and Roy
set up a simple loaded 1/4WL resonant *standing wave* monopole
and measured the standing wave current at the bottom and top
of the coil. EZNEC could have told them that they wouldn't
measure any phase shift around the coil or anywhere else
around along the antenna..

It's an easy mistake to make to look at the current displayed
by EZNEC and picture that current flowing from the feedpoint
to the tip while being 100% radiated in the process so the
current falls to zero at the tip of the antenna. As we know,
those are not the technical facts. The reflected wave is a large
percentage of the forward wave.

As seen from the graphic at: http://www.qsl.net/w5dxp/3freq.gif

that standing wave current can have virtually any magnitude but
has a phase that comes only in near-zero or near-180 degrees
increments.

I've been asking how to obtain phase information from a
standing wave current. Nobody has answered.
--
73, Cecil, W5DXP


 
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
Current in Loading Coils Cecil Moore Antenna 2 March 5th 06 08:26 PM
FCC: Broadband Power Line Systems Paul Policy 0 January 10th 05 05:41 PM
FS: sma-to-bnc custom fit rubber covered antenna adapter Stephen G. Gulyas Scanner 17 December 7th 04 06:42 PM
Current in antenna loading coils controversy (*sigh*) Roy Lewallen Antenna 25 January 15th 04 09:11 PM
Current in antenna loading coils controversy Yuri Blanarovich Antenna 454 December 12th 03 03:39 PM


All times are GMT +1. The time now is 08:25 PM.

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