LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #25   Report Post  
Old December 6th 05, 03:11 AM posted to rec.radio.amateur.antenna
Richard Harrison
 
Posts: n/a
Default Antenna reception theory

Roy Lewallen, W7EL wrote:
"A short while ago, I explained why your Faraday cage doesn`t separate
the E and H fields as you claim."
n
I am misunderstood. I never used the tem Faraday cage. I understand the
Faraday cage to be a completely shielded enclosure which could be a
metal automobiole body, a steel rebar reinforced concrete structure or a
screened room. These all tend to completely block both the E-field and
the H-field components of an electromagnetic wave.

I gave an example of the metal rakes (Faraday screens) used at the
medium wave broadcast plants where I worked. The function of the Faraday
screen was primarily to eliminate capacitive cooupling, and thus the
E-field between the transmission line and the antenna. This reduces
harmonic radiation. It adds expense and complexity but is worth the
price for lightning suppression if for nothing else.

Most Faraday screens are used at powerline
frequencies to eliminate capaacitive coupling between primary and
secondary of a power transformer.

I checked the internet for a recent posting and found an article by
who wrote: "Beware, this cannot be an
auto-transformer. It must be a transformer with two completely isolated
windings, and with a Faraday Screen wound between the two."

Why would one pay a lot of extra money for a transformer which
eliminated capacitive coupling if it didn`t work, especially in Havana,
Cuba?

Best regards, Richard Harrison, KB5WZI



 
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
Inverted ground plane antenna: compared with normal GP and low dipole. Serge Stroobandt, ON4BAA Antenna 8 February 24th 11 10:22 PM
significance of feedline orientation Brian Shortwave 6 October 22nd 04 01:43 AM
Question for better antenna mavens than I Tony Meloche Shortwave 7 October 28th 03 09:16 AM
QST Article: An Easy to Build, Dual-Band Collinear Antenna Serge Stroobandt, ON4BAA Antenna 12 October 16th 03 07:44 PM
Outdoor Scanner antenna and eventually a reference to SW reception Soliloquy Shortwave 2 September 29th 03 04:04 PM


All times are GMT +1. The time now is 09:31 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