pjp wrote:
In article ,
says...
I was given a 23-inch diagonal monitor and desktop that has all three
colors (blue white & hdmi) and the desktop can output blue white or hdmi
but the owners who gave it to me couldn't find the cables.

Does it matter in the "quality" of the end result which cable I buy?

Almost surely not. Same as old days and stereos with the gold plated
cables which are no better than regular quality made cables at 10X the
price. Signal is only electrons and they either can or can't traverse
the cable.

There is the skin effect, and where the currents for a
high frequency signals travel.

But usually, the precious metals tinting cables, are
on the business ends, and not in the part buried under
the plastic insulation. Just plain copper under there
would be more the norm. When I started in the business, lots
of stuff was nickel plated, but that isn't a popular practice
any more. The nickel plating stopped corrosion or oxidation.

A cable could have conductive loss as well as dielectric loss.
It's just possible the dielectric choice is more significant
than the outside conductor finish. HDMI cables do seem to differ
in dielectric loss, so there must be some differences in the "goo"
inside coaxial or biaxial sections. High speed signals
tend to be differential, and it helps if the environment
the signals move through, are "equal".

https://i.postimg.cc/k4bt1qWb/HDMI-c...ss-section.gif

The main diff pairs there are R,G,B, and CLK. The CLK being
one tenth the rate of the data waveforms. By sending a LF clock,
you can synthesize up a sampling clock from it, then phase
shift it dynamically to keep it centered. I have no idea
what the "training method" is on that standard. And how often
it might recalibrate.

When the signal launches, it's low amplitude. Let's pretend
for the same of argument, it is 1 volt tall. As the signal
moves down the HDMI cable, it shrinks in height. If might
be 0.05 volt high at the receiving end. The receiver thresholds
are just barely sensitive enough, to reliably detect that
signal. If you make the cable longer, the slicing action
will be off, the signals will start to get "fuzzy", the
eye opening will close, and the image will start to get
"colored snow" from the transmission errors. If you double
the length of the cable, so little "intelligence" will be
sensed in the cable, you lose "sync". Then the screen goes dark.

Paul