On Wed, 28 Feb 2007 20:35:27 GMT, Owen Duffy wrote:

Breaking out of the previous thread to explore the "power explanation" in
a steady state situation:

The scenario for discussion is a transmitter connected to a half wave of
600 ohm lossless transmission line connected to an antenna with a
feedpoint impedance of 70+j0.

The transmitter is rated for 100W output, 100W is developed in the 70 ohm
load, the VSWR on the transmission line is 8.6, the "forward power"
(meaning Vf^2/Zo) on the transmission line is 267W, the "reflected
power" (meaning Vr^2/Zo) on the transmission line is 167W, the DC input
power to the transmitter is 200W.

The questions a

Is there any internal inconsistency in the scenario characterisation, if
so, identify / explain?

What is the heat dissipated in the transmitter (and why)?

What part of the "reflected power" of 167W is dissipated in the
transmitter (and why)?

Owen

Hi All,

Per recent correspondence from Walt Maxwell, he has asked me to post
his contribution:

Hi Richard,

I'm in a hotel in Jacksonville, away from my home computer, and at
this time I can't access the rraa to send, can only receive, so I'm
asking for your help.

I've been reading the posts on this thread and find it interesting.
However, it's been only discussed academically. On the other hand,
I've made measurements that prove the results described, measurements
made since those reported in Reflections 2.

I'd like for you to alert the posters on this thread to see Chapter
19A that will appear in Reflections 3, which is available for download
from my web page at www.w2du.com. The entire chapter was written as a
final epilogue to Bruene's fiction, but the portion pertinent to the
thread is in the last portion of the chapter concerning the
measurements made using a Kenwood TS-830S. Therein lies
the proof.

It would be nice if you could post the entire portion of the
measurements section, but that probably wouldn't work, because of
special characters used in Word that wouldn't appear in the text.
Anyway, I'd like for the posters to know that experimental proof
exists to support the claims made in the thread.

Thanks, Richard,

Walt


73's
Richard Clark, KB7QHC