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Re: [TowerTalk] Resistance of RG-8 cable?

To: <>
Subject: Re: [TowerTalk] Resistance of RG-8 cable?
Date: Thu, 10 Dec 2009 20:53:32 +0000
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That seems about right to me.  And yes, if the resistance gets higher it
could point to problems, but I would blame it mostly on poor connectors
rather than the cable unless it was corroding through the shield.  You
should also check the resistance between the center conductor and shield
with the far end open circuited to check for water saturation of the
dielectric.  I think a better test is a return loss test at 10m, leave the
far end either open or shorted and measure the reflected power or swr, the
higher it is the better the cable.

David Robbins K1TTT
AR-Cluster node: 145.69MHz or telnet://

> -----Original Message-----
> From: []
> Sent: Thursday, December 10, 2009 20:42
> To:
> Subject: [TowerTalk] Resistance of RG-8 cable?
> Hi Guys,
> I'm wondering what the typical resistance should measure on a 100'  length
> of RG-8 coax with one end shorted?  I'm measuring 1.5 ohms when  shorting
> one end of a 240' length of RG-8 ... is that about normal?
> Question 2: Measuring in the above manner, should the resistance increase
> as the coax gets a few years old?
> I'm looking for a simple way of determining the aprx. efficiency of  older
> RG-8.
> 73,
> Dick- K9OM
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