[Antennas] Old Coax

Thu, 12 Sep 2002 07:26:47 -0700

The link below www.wireman.com   should be www.thewireman.com


  At 09:48 AM 9/12/2002 -0400, you wrote:

>Larry,
>
>Coax does age and become more lossy with age.  Their especially shows
>y=up when used at VHF and UHF frequencies.  The plasticizers used in the
>plastic to make it flexible, contaminate the center insulator.  There
>are non-contaminating types of coax available.  The useful life is
>determined by measuring power into the coax terminated in a dummy load
>and the power measured at the dummy load.  If you are satisfied with the
>loss, it OK for your application. Most coax cable today are good for at
>least 5 years. You may be interested in getting "the wiermans coax book"
>or look at www.wireman.com .The www.davisrf.com site also has good
>info on coax losses.
>
>Your mileage will vary compared to anyone else's...
>
>Jerry
>W3CDE
>
>-----Original Message-----
>From: Lefczik, Larry D [ mailto:[email protected]
><mailto:[email protected]> ]
>Sent: Thursday, September 12, 2002 9:13 AM
>To: [email protected]
>Subject: [Antennas] Old Coax
>
>
>I've seen several times that coax cable should be replaced after a few
>years.  Why is this?  Is it just because of UV exposure to the outer
>jacket?
>If so, is coax which is still on a spool good forever?  Is coax used
>indoors
>subject to aging?  What about MIL-STD coax, is that less susceptible to
>aging?
>
>A lot of questions, but the main question is, why is it recommended to
>replace coax periodically?
>
>Thanks de WA2EHZ
>
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