On 1/11/2014 11:33 AM, Jeff wrote:
On 11/01/2014 14:12, Jerry Stuckle wrote:
On 1/11/2014 5:24 AM, Jeff wrote:


As for handling more power - rubbish. The current in 75 ohm coax is
lower than that in 50 ohm coax, for the same power rating.


Can you not see the stupidity if that remark???

Jeff


It is perfectly true. P=I^2xR. As R increases, I MUST decrease to
handle the same power. And since current is the limiting factor in
wire, you don't need as large a gauge of wire to handle more power.

You really should learn what you're talking about before opening your
"mouth". You only continue to show your ignorance.


Perhaps you should actually look at the theory of coax transmission
lines. If you did you would find that the optimum impedance for max
power handling peaks at about 30 ohms and falls away either side of that
impedance, 50 ohms being better than 75 ohms. It is a little more
complicated than just Ohms Law.

It would appear that it is you who are showing their ignorance, and
inability to even look at the article that was linked in post that you
were replying to!!!
http://www.belden.com/blog/broadcastav/50-Ohms-The-Forgotten-Impedance.cfm


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.

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Jerry, AI0K

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