View Single Post
  #87   Report Post  
Old August 29th 06, 07:27 PM posted to rec.radio.amateur.antenna
Cecil Moore Cecil Moore is offline
external usenet poster
 
First recorded activity by RadioBanter: Jul 2006
Posts: 1,614
Default Mismatched Zo Connectors

Jim Kelley wrote:
You really do need to choose your words a bit more carefully, Cecil.


Your statement is a personal opinion without technical content.

200W SGCL----one second long lossless feedline----100W SGCL
200W-- --100W


Yes. But how much is there with the circulator load removed? (Not
replaced by an autotuner.) Numbers please.


OK, let's remove the circulator loads and replace them
with unknown devices or objects inside black boxes.

Here's the same one second long lossless feedline with
unknown black boxes connected at each end (where BB stands
for black box).

BB#1------one second long lossless feedline------BB#2
200W-- --100W

Given: all conditions on the one second long lossless feedline
are identical in both of the above examples.

The laws of physics tell us that the joules in the two
lines with identical conditions are equal, i.e. 300
joules in these two cases. It doesn't matter what exists
or doesn't exist at the two ends of the line. 200 watts
forward and 100 watts reverse requires 300 joules/sec.

In other words, given a purely resistive Z0 and a properly
calibrated wattmeter, it is impossible to get 200 watts
of forward power and 100 watts of reverse power without
there being 300 joules in the one second long lossless line.
If there wasn't 300 joules in that line, we wouldn't
measure 200 watts forward and 100 watts reverse.
--
73, Cecil, http://www.qsl.net/w5dxp