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

 To: RLVZ@aol.com, towertalk@contesting.com Re: [TowerTalk] Resistance of RG-8 cable? TexasRF@aol.com Thu, 10 Dec 2009 18:03:56 EST mailto:towertalk@contesting.com>
 ``` 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 performing. 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. 73, Gerald K5GW In a message dated 12/10/2009 2:42:55 P.M. Central Standard Time, RLVZ@aol.com 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 RG-8. 73, Dick- K9OM _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/listinfo/towertalk ```
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