View Single Post
  #180   Report Post  
Old June 9th 10, 02:26 PM posted to rec.radio.amateur.antenna
Keith Dysart[_2_] Keith Dysart[_2_] is offline
external usenet poster
 
First recorded activity by RadioBanter: May 2007
Posts: 492
Default Question about "Another look at reflections" article.

On Jun 8, 11:05*pm, Cecil Moore wrote:
On Jun 8, 8:33*pm, Keith Dysart wrote:

Perhaps you could locate a flaw in the time domain analysis. Finding a
flaw would pretty much settle the matter.


Everything I covered is covered in "Optics", by Hecht. If you can
locate a flaw, you need to convince Hecht (and Born & Wolf) to expand
their reference books to cover your pet subjects that they consider
"of limited utility".


Let us follow the chain:
1. Hecht writes a book on OPTICS that includes some models.
2. Cecil reads the book.
3. Cecil interprets his readings.
4. Cecil applies his interpretations of the models to transmission
lines.
5. Cecil draws some conclusions on the behaviours.
6. Keith, using basic circuit theory, reflection coefficients and
analysis in the time domain, shows that Cecil's conclusions do not
align with expected behaviours.
7. Cecil says any disagreement with Cecil's conclusions is a
disagreement
with Hecht.

I suggest the error is more likely in steps 2 to 5; Hecht is, after
all,
well respected.

In particular, 4. seems like a candidate. It is quite possible that
Hecht understood the limitations of his models and that these models
do not align with the detailed behaviour on a transmission line,
though
they might be completely adequate for the behaviours with light that
Hecht was addressing in Optics.

One must always be careful when applying a model in a different
domain.

Cecil

....Keith