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

Subject: Re: [TowerTalk] Resistance of RG-8 cable?
Date: Thu, 10 Dec 2009 18:03:56 EST
List-post: <">>
Dick, the ohm meter test is d.c. only but it will detect a shorted or open  
cable. The loss has to be determined with real r.f.. Starting with say, 100 
 watts, how much power is present at the end? 
Compare that loss with a chart  or on line calculator to see how it is 
Since the ohm meter is d.c., the resistance will not change with age. There 
 are other ways to determine the loss based on vswr with the end of the 
cable  open or shorted. That subject is covered well in the ARRL handbooks. The 
higher  the frequency, the higher the loss and lower vswr and easier to 
determine  loss.
Gerald K5GW
In a message dated 12/10/2009 2:42:55 P.M. Central Standard Time, writes:

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 

Dick-  K9OM

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