Hi Chris:

The loss of coax cable varies with frequency.  To measure connect a signal generator at one end (the output impedance of the generator must match the cable impedance, 75 Ohms for RG6 & RG11) and connect a power meter at the other end (the impedance of the sensor must also match the cable impedance). Measure the loss after a proper calibration.  You can sweep frequency and make a better measurement using a network analyzer and a 75 Ohm test set.

73,

Brooke Clarke, N6GCE
http://www.prc68.com


>
> Date:    Wed, 12 Jun 2002 12:58:13 -0400
> From:    Chris Carbaugh <CCarbaugh@LEERELECTRIC.COM>
> Subject: [EE]: Measure signal loss on coax cable
>
> Hello all,
>
> I'm looking for a method to measure signal loss (db) on RG6 and RG11
> coax cable.  I think I can do this with just an ohm meter, but I'm not
> sure how to cap the opposite end.
>
> What I'm trying to accomplish is to (1) calculate the actual loss on a
> coax run, and (2) calculate the length of the run by comparing signal
> loss to the specs from the manufacturer.
>
> Most coax manufactures (I believe) specify signal loss per foot.
>
> Any help greatly appreciated,
> Chris

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