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September 1997

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Subject:
From:
Sheila Smith <[log in to unmask]>
Reply To:
TechNet Mail Forum.
Date:
Fri, 26 Sep 1997 15:25:02 -0400
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Jim,  Are you temp cycling the coax after bending but before installing
connector(s) to stress relieve the PTFE dielectric?  That has given us
problems in the past, especially with short cable lengths.  Sheila Smith,
Tracor Aerospace


At 02:20 PM 9/26/97 -0400, you wrote:
>I'm trying to assemble semi-rigid coax cables made with MIL-C-17 RG402 .141"
>dia. cable and MIL M39012/79 P/N 3002 connectors.  The cables are being tested
>over a frequency range of 8 to 18 gigahertz, and the spec requirement is 1:1.2
>VSWR.  So far, we are getting approximately a 50% yield.  While bad cables are
>out of spec at room temperature, we did notice that if we have a marginal
>cable, it goes out of spec (many times to an RF open) when heat is applied (hot
>air gun no more than 150 degrees F).  Good cables hardly change at all.
>
>Are we pushing the limit with our tight VSWR requirements?  Should this be
>achievable?  If so, does anything come to mind as to what we might be doing
>wrong?
>
>Thanks in advance for your quick responses,
>
>Jim Marsico
>(516) 595-5879
>
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