View Single Post
  #128   Report Post  
Old August 28th 03, 03:52 AM
Richard Clark
 
Posts: n/a
Default

On Thu, 28 Aug 2003 00:33:08 -0000, "David Robbins"
wrote:

you have also hit on the basic problem in this discussion. there are two
totally different topics in play here and they are getting mixed up back and
forth all over this thread.

case 1: transmission line with a load..

case 2: generator feeding a load...

keep your conditions straight or these discussions will go on for ever with
both sides knowing they are right and that the other one is wrong.... but
only because they are discussing two different problems.


Hi David,

If you don't respond with an answer, I will mark it up to your having
lost track of the thread through your computer swapping. I quoted
only as much of your post to offer that I have no interest in the
conjugation issue whatever logic it is cloaked in. This is a simple,
practical example expressed in heat lost in the transmission line.
Very simple conditions, two resistors and a hank of transmission line.

The scenario begins:

"A 50-Ohm line is terminated with a load of 200+j0 ohms.
The normal attenuation of the line is 2.00 decibels.
What is the loss of the line?"

Having stated no more, the implication is that the source is matched
to the line (source Z = 50+j0 Ohms). This is a half step towards the
full blown implementation such that those who are comfortable to this
point (and is in fact common experience) will observe their answer and
this answer a

"A = 1.27 + 2.00 = 3.27dB"

"This is the dissipation or heat loss...."

we then proceed:

"...the generator impedance is 100+0j ohms, and the line is 5.35
wavelengths long."

73's
Richard Clark, KB7QHC