CAT5e termination

I want to use CAT5e cable for transmitting signals of around 6MHz. What is the correct resistor value for termination?

Sorry if this is multiple posted, something seems a bit strange with my s/w...

Anyway, I want to send a (roughly) 10MHz signal over CAT5e driven by a RS485 differential driver. What is the correct termination resistance?

plus or minus...?

Plus. Minus 100R would probably cause oscillation.

;-)

Definitely plus. Minus 100 ohm resistors are much harder to find.

--

--------------------------------------+------------------------------------ Mike Brown: mjb[-at-]signal11.org.uk |

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They're right next to the flux capacitors, you silly boy! ;-)

Hummm... a resistor has V = I*R, while a capacitor has V = integral I*C dt. So a flux capacitor has Phi on one side or the other.

Now, a reluctance has MMF = Phi * scriptR (a "flux resistor"), so a flux capacitor should have MMF = integral Phi*C dt.

Now, in flux, it turns out that reluctance is conservative, so its phase shift should be unconservative (i.e., lossy). In other words, the imaginary component of permeability mu'', or epsilon'' for permittivity.

Interestingly, this means there is no such thing as a flux inductor (barring active devices with an external power source), because it would have negative loss, i.e. instead of consuming power, it would generate power, like the fabled negative resistor.

In conclusion: a flux capacitor is just a hunk of steel (lots of eddy and hysteresis loss). ;-)

Tim

:-D

Plus or minus 5% should be fine, depending on what kind of VSWR your ezuipment is capable of handling. ;-)

Cheers! Rich

AKA: A compacted Delorean. ;-)

Or as Elmer would say "Wefwections... Huhuhuhuhuhuhu..."

It won't work. CAT 5e has too many tpi. :-) Need to step back to something older.

(wonder how long it will take folks to get what that refers to)

Of course - you've reminded me where I've put that Tunnel Diode.

Be careful. They like to tunnel their way out of their package. ;-)