Hi Steve,

Very interesting photo, do you have more from different perspectives?
The soldermask 'dam' is a great example of a technique I used at another
company.

The 'coined' or flattened lead from the SMA looks to be pulled away from the
solder joint... I would guess this happened after a thermal excursion, where
the chassis expanded faster than the board and the lead literally pulled the
SMA pin loose from the solder connection.

I can't tell a lot from the photo because of the frosted Plexiglas
appearance surrounding the top of the photo, but I have see this sort of
failure before in similar situations...

The solution to the problem is to strain relief the connection.
We used a silver ribbon and soldered it to the pin and the board allowing it
to flex to take up the CTE mismatch between the aluminum housing and the
Duroid board.

Hope that helps... let me know if I read the problem correctly... it was
just a guess based on what it looks like to me from here... not being able
to see the whole picture...

Best regards,

Bill Brooks - KG6VVP
PCB Design Engineer , C.I.D.+, C.I.I.
Tel: (760)597-1500 Ext 3772 Fax: (760)597-1510
e-mail:[log in to unmask]
http://www.dtwc.com
http://pcbwizards.com


-----Original Message-----
From: Steve Gregory [mailto:[log in to unmask]]
Sent: Friday, December 17, 2004 12:35 PM
To: [log in to unmask]
Subject: Re: [TN] Wanted: TN's best-on-coax-soldering

Sorry Everyone! My bad, I didn't have the thumbnail linked to the
picture...but it is now. Try this link:

http://www.stevezeva.homestead.com/files/SMA.jpg

Just got in a hurry when I posted the picture. I'm trying to get all my
loose ends tied-up here at work because I'm leaving this weekend for
Christmas vacation.

-Steve Gregory-

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