LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #11   Report Post  
Old November 14th 03, 04:43 AM
Yuri Blanarovich
 
Posts: n/a
Default


Well, I care a great deal myself, I can't see how this would help me
at all. What would you do about it?


Mike,
to put in perspective, and I tried to point out in the course of threading this
thread, the significance is this:

1. Impact on effciency - efficiency is roughly proportional to the area under
the current curve over the radiator. When the current drop across the coil is
significant, that "eats" the portion of the curve and the curve above the coil
is much smaller (cosine or triangle shape), less efficiency (than shown in some
pictures).

2. Understanding the effect allows to better optimize the antenna performance,
be it through modeling or experimenting and measuring. That's why top hats look
so good. We are not talking just fraction of dB, on low bands that shows as 10s
of dBs on signal.

3. Proper modeling in software will allow better design and optimization. See
case of linear loaded 80m KLM beam vs. modified with loading coils, big
difference in pattern and gain and performance.

4. If the modeling software can not capture the effect, than your designs of
multielement loaded antennas are off.

This exercise already opened my eyes wider and after I test the designs, I will
hopefully come up with some better mobile antennas.

Yuri
 
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
Smith Chart Quiz Radio913 Antenna 315 October 21st 03 05:31 AM
QST Article: An Easy to Build, Dual-Band Collinear Antenna Serge Stroobandt, ON4BAA Antenna 12 October 16th 03 07:44 PM
Eznec modeling loading coils? Roy Lewallen Antenna 11 August 18th 03 02:40 AM


All times are GMT +1. The time now is 06:07 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