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In Reply to: RE: Incomplete posted by audioengr on November 17, 2013 at 11:25:33
"The effects of crystal lattice are totally overlooked. One needs a high-speed stimulus and real-time multi-GHz scope to see these things. A TDR can also be used."
Love to see those pictures, if you still have the necessary test equipment.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
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The graph above shows the same interconnect cable before and after dipping in liquid nitrogen. Red is after. Notice all of the new reflections.Steve N.
Edits: 11/18/13 11/18/13 11/18/13
Very interesting. Thanks.
What was the scale? I had trouble making out the lettering on the graph.
There appears to be a DC offset between the two cases, unless this was an artifact of the plot to keep the curves separate. Could you explain what you think is happening?
Have you done these tests in a controlled way, e.g. with two cables that started out with identical measurements and then one was treated? This would make it possible to run repeated (even random) tests to show definitively that the differences weren't due to some other factor, e.g. power line voltage, noise, temperature, warmup of test equipment or whatever...
Or maybe these measured differences is old hat to cable experts. I just haven't come across it before, but then I haven't gone looking either. Thanks.
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
The two cables had identical measurements, before and after the TDT measurement.If I remember correctly I moved the two graphs so you could see the detail.
I ran the test multiple times at once on both cables. It is definitely not due to power or anything else. No power variations will affect this equipment.
Edits: 11/18/13
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
It was posted on my website for many years, but I discontinued selling cables a few years ago and it was removed from the website.It just demonstrates that even at audio frequencies, there are things that the typical measurements do not detect, but the human ear does. My brother is a metallurgical engineer, so he educated me a bit on metal crystal lattice. Metallurgy is the aspect that most cable manufacturers ignore or don't understand. This is why there are good silver cables out there and poor ones. They are not all the same by any means.
Edits: 11/19/13
How do you know that the differences are due to changes in the metal and not to changes in the dialectric?
Tony Lauck
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
Because I have designed cables with poor metallurgy and good metallurgy with the same conductor material, gauge, dielectrics and construction. The good metallurgy trumps the poor. Been there, done that.
It's quite possible the strange spectra shown in graph explains why practically noone employs direct immersion, at least for audio related items.
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