LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #9   Report Post  
Old July 19th 06, 07:14 PM posted to rec.radio.amateur.homebrew
external usenet poster
 
First recorded activity by RadioBanter: Jul 2006
Posts: 102
Default What is a wire antenna's impedance? -followup

Hi Andy,

"AndyS" wrote in message
ups.com...
Now, if the counterpoise was at infinity, the Efield must always be
zero,
since any voltage divided by infinity ( to give V/M) will be zero.


If I take a charged sphere with 1V applied, the E field falls off as 1/R all
the way out to infinity; it is only there that it's actually zero, yes?

If you know of an antenna that has no counterpoise for the "hot"
side to
work against, please post some information about it......


How about a half-wave antenna (end-fed zepp)? Assuming it's being fed by
coax, would you suggest the counterpoise is the ring making up the shield of
the coax right where the coax stops and the antenna starts?

I would like to hear from someone like Roy as well, since I certainly am
well outside of any areas of significant experience here.

---Joel


 
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
Question is 'it' a Longwire {Random Wire} Antenna -or- Inverted "L" Antenna ? RHF Shortwave 5 November 6th 05 04:52 AM
Two Shortwave Listener (SWL) 10:1 Baluns for Random Wire Antennas RHF Swap 0 October 6th 04 09:51 PM
RF filters and Impedance Matching Paul Burridge Homebrew 16 April 10th 04 01:29 PM
Question for better antenna mavens than I Tony Meloche Shortwave 7 October 28th 03 09:16 AM
Balun JJ Shortwave 43 August 7th 03 07:21 PM


All times are GMT +1. The time now is 10:02 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