On 1/12/2014 5:51 AM, Jeff wrote:
Jeff

Try again. I had it back in college in the early 70's (as an EE major),
and I don't think the laws of physics have changed.

And the best impedance for a coax is that which matches the input and
output impedance of the system, or if the input and output are of
different impedances, acts as a matching stub between the two.

And yes, I read the article. But you obviously don't understand it. The
30 ohms they are talking about was for ONE SPECIFIC REQUIREMENT. That
does NOT mean it is true in different situations.

I suggest you learn what you're talking about before you make yourself
look even sillier.


Well let me think; who am I doing to believe; text books on transmission
line theory, data sheets for coax cables, and an article by well
respected cable manufacturer), or your personal (and incorrect) theory??

Perhaps you should also point out to Belden that their article is wrong
as well!! If you think that sending power over a matched cable is a
specific requirement then you obviously do not understand the article.

Jeff

I go by my textbooks and professors. I don't believe someone who read
an article about a specific installation and tried to apply that to the
entire world.

And I didn't say their article was wrong. I said YOUR APPLICATION of
what the article said is wrong.

Two entirely different things.

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On 1/12/2014 12:00 PM, Jeff wrote:


I go by my textbooks and professors. I don't believe someone who read
an article about a specific installation and tried to apply that to the
entire world.

And I didn't say their article was wrong. I said YOUR APPLICATION of
what the article said is wrong.

Two entirely different things.


The point that are missing is that the graphs in that article are
independent of application. They represent the true picture for
correctly terminated coax. You also seem not to understand how those
graphs are derived.

Jeff

OK, I give up. From reading one chart, you know more than all of the
physicists, professors and engineers in the world. And you can write
the book that contradicts every physics textbook out there.

You're THE MAN! I bow to your expertise.

NOT!


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