Simon,

I think you have a basic misunderstanding of skin
effect. You comment that "Video signal however
travels
through the center of the wire". Here you imply
that the impedance will be greater because it's
not traveling through the copper plated to the
steel.

The truth is that at DC, that current will flow
through the entire cross section of the wire,
in inverse proportion to the impedance of the
material. You will find that for any center conductor,
that loss increases with increasing frequency.
This is always true, because even if the center
of the conductor had an impedance 100 times that
of the outer layer, at DC and lower frequencies,
the center material still lowers the impedance
of the conductor, because the two conductors are
in parallel.

Think of it this way... if you have a 1000 ohm
resistor, what resistance do you need to put in
parallel with it to increase the resistance to
greater than 1000 ohms?
Answer: You can't. If you use an infinite resistance,
you still have an impedance of 1000 ohms. Even
if the resistor you add in parallel is 1000000
ohms, the total impedance of the system is 999
ohms, less than the 1000 ohms of the original
resistance.

So... if the 1000 ohm resistor in the example
above is the outer skin effect, and the inner
conductor is the resistance we are adding, you'll
note that the energy loss can only increase with
frequency. Or, the lower in frequency, the better
a cable of a given center conductor type will
perform.

My point is that for a 40' long component video
cable, that you can choose RG59 or RG6. The specs
of the cable itself are almost a non issue. I
think someone would have difficulty buying something
that wouldn't work well. The biggest issue is
terminating the cable well (With CCS or aluminum
braid, you better be using crimp, snap/seal, or
compression connectors, as you can't solder them
well.) and making sure the cable is not damaged
during install or construction.

I think there is way too much of, my brain is
bigger than yours going on here,

however allow
me to correct myself. i should have said that
video signals travel through the entire thickness
of of the center conductor as opposed to just
the copper clad skin, therefore the frequencies
not travelling on the surface (most of the signal)
will suffer as a result of the steel not being
nearly as conductive as a solid copper core.
I hope this satisfies your need to make assumptions
about and correct what i believed to be an accurate
and helpfull explanation without all the unrequired
technical BS that i see so much of here. I'm a
practical guy and try to give practical help.

Simon.

Thanks bcf. An opinion that appears relevant
to the original question. Have you or anyone
else used both and been satisfied with the results?

Let's see, I tried to correct and explain a misstatement,
so you give the jab above...

Speaking from a purely practical standpoint, your
statement is misleading at best. What you have
been implying is that a solid copper center conductor
RG/59 will outperform RG6 with copper plated steel
in the application in question. The question
was about a 40' run of RG6. I challenge you to
tell the difference between the two in a 40' run.
(Is that practical enough!)

Just to be clear, the technical information I
gave was not BS. I actually understand transmission
lines, and the theory and its practical application.
The problem is that too many on this forum like
to throw the concepts around and misapply them.

. . . plenty of others in this forum have posted the
"merits" that only RG59 will work, and that RG6
will not.

I believe he meant "you don't want to use CCS
unless you are keeping well above about
50 mHz."

You think a typo is embarrassing in a post? How about the one I just found in this section, that has been showing up on EVERY post for three weeks?

We have been using MIT's "one wire" with their
75 ohm ends ( simple screw on type ) for our