Coaxial Cable Capacitance

-_nando-_ · 17th March 2007, 03:49 PM

Hi all !

Does anyone here know how much capacitance/m a coaxial cable (75Ohms), just like those that we use to extend our TV antenna, have??

I built a measurement microphone, and the cable impedance is pretty critical.

Best Regards !

DcibeL · 17th March 2007, 04:06 PM

there are many different types of 75 Ohm coax cable, but the majority that is used for cable TV transmission is this RG59 from Belden.

sawreyrw · 17th March 2007, 04:13 PM

The capacitance of a coaxial cable depends on the dielectric constant of the cable, but for 75 ohms is should be around 20 pF/ft.

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17th March 2007, 04:06 PM	#2
DcibeL diyAudio Member Join Date: May 2003 Location: Saskatchewan	there are many different types of 75 Ohm coax cable, but the majority that is used for cable TV transmission is this RG59 from Belden.

17th March 2007, 04:13 PM	#3
sawreyrw diyAudio Member Join Date: Apr 2006 Location: Minnesota	The capacitance of a coaxial cable depends on the dielectric constant of the cable, but for 75 ohms is should be around 20 pF/ft.

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