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December 2009

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Subject:
From:
Graham Collins <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, [log in to unmask]
Date:
Tue, 15 Dec 2009 07:43:11 -0400
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A question for the TechNet cable gurus.  We are putting together some
semi-rigid coax cables and as this is new ground for me I'm not clear on
some of the inspection criteria.  IPC/WHMA-A-620 is helpful, but
expresses things in absolutes.  In particular, two things are being
questioned:

1)	Air gap between dielectric and cable shield is not allowed.
Figure 13-62 shows it.  But how extreme is that "not allowed"?  Under
magnification there can easily be a gap that is not substantial, and is
not visible to the naked eye.  What sort of magnification should we be
using?
2)	Dielectric below flush with the connector face - again there is
no stated wiggle room on this.  Any tips on arriving at a reasonable
compromise?  If I can see a .001" gap do I reject it?  

regards, 
  
Graham Collins 
Halifax Production Engineering 
(902) 873-2000 ext. 6215 

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