[aprssig] FW: D-sub connector components

scott at opentrac.org scott at opentrac.org
Mon May 23 17:04:37 EDT 2005

595&Site=US> &Row=106595&Site=US
There's an example of a DB9 with mating-side 0.25" clinch nuts.  Those will
let you capture the screws on a GPS cable.
BTW, I can recommend SF Cable.  They've got good prices, and I've always
gotten fast shipping and good service from them.


From: aprssig-bounces at lists.tapr.org [mailto:aprssig-bounces at lists.tapr.org]
On Behalf Of Keith Kotch
Sent: Monday, May 23, 2005 11:36 AM
To: 'TAPR APRS Mailing List'
Subject: RE: [aprssig] FW: D-sub connector components

I did find this supplier,


These are the kind of backshells I'm looking for.  Integral "clinch nuts" is
the thing I don't see listed or don't know for sure if that's what I want.


The application I've got is a KPC 3 tnc with a 25 pin female connector for
the computer, or gps in a standalone configuration case, and a 9 pin female
connector on the gps.  An off-the-shelf null modem adapter is usually a 25
pin male to 9 pin female.  A 25 pin male to 9 pin male null modem appears to
be much, much rarer and if the adapter type backshells are available, it'll
be just as easy (arguably) to create my own custom adapters.  Since I found
a source for the backshells as noted above, the next problem is locating the
necessary securing hardware.  I need screws to screw the adapter onto tnc
and nuts on the 9 pin side of the adapter to capture the screws on the gps 9
pin connector.


Keith, KF4BXT



From: scott at opentrac.org
Subject: RE: [aprssig] FW: D-sub connector components


Digi-Key and Mouser should both have all of those parts.  I can suggest some
part numbers for the 9-pin connectors and backshells.  I carry those on my
own site as well:  http://n1vg.net/opentracker/purchase.php


The backshells come with all the hardware.  For the side connecting to the
GPS cable, you might want connectors with integrated clinch nuts.  Digi-Key
carries a couple thousand d-sub connectors and they've got the best
parametric search around.


Let me know if you find any good homebrew techniques for overmolding.  I've
done some stuff with hot melt glue when necessary, but that's about it.  I
need some custom molding myself - I've got to make cables for Motorola
handhelds, and the spacing between the 2.5 and 3.5 mm plugs is too small for
separate connectors.  Mouser sells plugs designed for overmolding, but aside
from investing some serious money in tooling and injection molding, I don't
know how you'd use them.




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