Cable Asylum

I looked up the precision link IC's..weird

130.199.3.130

In Reply to: RE: Or, you could try dynamic loading and tell us how well it works. posted by Al Sekela on June 28, 2007 at 12:45:54

They are spec'd at 59 pf per foot and .490 uH per foot, or 490 nH per foot.
59 times 490 = 28910...divide by 1034, give 215.
That's way too high for a dielectric coefficient. Something in the data is incorrect. I suspect the inductance is too high..
It's Z calcs out to 91 ohms. But I question that because the LC product is wacked out..
EDIT: thought about it a bit. They claim foamed dielectric, which should give a DC of around 2... Since the calcs are out by two powers of ten, I think they have put the capacitance and inductance of a ten foot cable, and forgot to divide the numbers by ten..
That still gives a cable Z of 91, but it makes the DC 2.15, now that is more reasonable..
Cheers, John

Edits: 06/28/07

Follow Ups:

RE: I looked up the precision link IC's..weird - JB 06:37:26 06/29/07 (1)
- no. - jneutron 06:00:26 07/02/07 (0)

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