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Old 1st February 2014, 08:20 AM   #41
AuroraB is offline AuroraB  Norway
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Location: Norway, -north of the moral circle..
finally......
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Old 1st February 2014, 09:17 AM   #42
gk7 is offline gk7
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Quote:
Originally Posted by DF96 View Post
Unless the wires are very thin (high resistance) or very widely spaced (high inductance), matching to with a metre or so will do. That assumes, of course, that the wires understand and obey the laws of physics. If you have wires produced by alien technology or snake-oil merchants then much closer matching may be needed.
Even alien wires will have to obey the laws of physics, if they understand them is a different matter of course.
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Old 1st February 2014, 10:24 AM   #43
AndrewT is offline AndrewT  Scotland
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Originally Posted by AndrewT View Post
what you show applies to one cable, usually a cable pair or a coax pair (core+screen)

but when you parallel multi strands, the capacitance must change.

Looks like that must be my first experiment. Confirm that a twisted pair is different from a star quad.
I have a few starter results.
Cut a 2.1m length of CAT5 marked PRESS-LINK 4/24 UTP 568-B.2 Category 5E 31783M

2 core twisted
102pF brn/brnwht shortest helix pitch
104pF org/orgwht
107pF grn/grnwht
109pF blu/bluwht longest helix pitch
for the 4 different twists.
All the cores were twisted clockwise looking end on.
All 4 pairs were also twisted clockwise in the lay, pitch ~130mm.

Paralleling 2pairs
209pF grn+brn / grn/wht+brnwht
213pF org+blu / orgwht+bluwht

paralleling 4pairs
425pF

using one pair as Hot and a second pair as cold, the hot to cold capacitance was:
77pF
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Old 15th March 2014, 06:42 PM   #44
AndrewT is offline AndrewT  Scotland
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I measured a 2.1m length of CAT5e star quad today:
241pF

Slightly more capacitance than the 2pairs together. Same resistance. Unknown inductance.
More than double the capacitance of the single pairs.
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