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December 2002

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Subject:
From:
"Barmuta, Mike" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 19 Dec 2002 10:01:26 -0800
Content-Type:
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Richard: In addition to the copper plating thickness in the holes there is
another issue you may want to look into. Since this is a PTFE for RF you
should verify that the boards are being properly treated/conditioned to
allow a good bond of the catalyst/electroless Cu to the hole wall. Although
these are double sided and not MLB's the PTFE holes still need to be
conditioned for proper bonding.

                                                                Regards

Michael Barmuta

Staff Engineer

Fluke Corp.

Everett WA

425-446-6076



-----Original Message-----
From: Richard Brennan [mailto:[log in to unmask]]
Sent: Thursday, December 19, 2002 8:44 AM
To: [log in to unmask]
Subject: [TN] Plated Through Holes


Hi everyone
Can anyone tell me what the recommended thickness of the barrels of PTH's
is?
We have a minor problem with 0.4mm dia. barrels not giving good ground from
top of board to ground plane on underside.
Boards are double sided PTFE / copper track / Emersion tin RF boards.

Richard Brennan
Manufacturing Support Manager
Health & Safety Manager
Aerial Facilities Ltd
Aerial House
Asheridge Road
Chesham
Bucks
HP5 2QD
01494 777000
Direct line
01494 777052

[log in to unmask]

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