LinkBack Thread Tools Search this Thread Display Modes
Prev Previous Post   Next Post Next
  #7   Report Post  
Old December 21st 05, 09:29 PM posted to rec.radio.amateur.antenna
Owen Duffy
 
Posts: n/a
Default Standing Waves (and Impedance)

On Wed, 21 Dec 2005 20:18:05 GMT, John Ferrell
wrote:

On Tue, 20 Dec 2005 03:41:41 GMT, "W. Watson"
wrote:

I'm trying to make
some sense out of why the emphasis of standing waves.


Here is the short version:
A matched transmission line behaves like the theory books say it does.
The rated power from the transmitter goes through the transmission
line with the lowest possible loss to the antenna where it is radiated
just like the book says.


It is true that reducing SWR for a given line does reduce the loss if
the line is long enough. (There are some scenarios where a short line
with high VSWR has less loss than matched line of the same length.)

But is matched line the real goal?

If low loss is the goal, there are often cost effective lower loss
solutions possible with lower loss line operated at high VSWR.

A mismatched transmission just MIGHT work OK. If there is any
possibility of generating interference, especially TVI, it will. The


Why? How is TVI "generated" by line mismatch?

Owen
--
 
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
Traveling Waves, Power Waves,..., Any Waves,... pez Antenna 10 December 13th 03 02:43 PM
Calculus not needed (was: Reflection Coefficient Smoke Clears a Bit) David or Jo Anne Ryeburn Antenna 17 December 13th 03 10:48 AM
Smith Chart Quiz Radio913 Antenna 315 October 21st 03 05:31 AM
A Subtle Detail of Reflection Coefficients (but important to know) Dr. Slick Antenna 199 September 12th 03 10:06 PM
Length of Coax Affecting Incident Power to Meter? Dr. Slick Antenna 140 August 18th 03 08:17 PM


All times are GMT +1. The time now is 07:30 PM.

Powered by vBulletin® Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright ©2004-2024 RadioBanter.
The comments are property of their posters.
 

About Us

"It's about Radio"

 

Copyright © 2017