[Fourlanders] Random PCB Manufacturing Data

[Jim Worsham]

It was probably me.  I can remember when I was a young engineer in the early
80s.  We thought we were doing something when we went from double side to 4
layer boards.  Then we went to surface mount parts and thought we were gods.
I look at the stuff that is made now, 20+ layer boards and ICs with several
hundred connections.  I can't even wrap my mind around something like that.
I am just glad to hear that someone in the US is still doing electronics!

73
Jim, W4KXY

-----Original Message-----
From: fourlanders-bounces at contesting.com
[mailto:fourlanders-bounces at contesting.com] On Behalf Of Brian McCarthy
Sent: Thursday, February 03, 2011 5:00 PM
To: Fourlanders
Subject: [Fourlanders] Random PCB Manufacturing Data

Sometime back, maybe during the June 2010 contest, I was talking a bit
of shop with someone on the mountain. The question came up about how
thick are 20+ layer PCB's. I have four different new solder sample
bare boards of 20 layers each at my desk today. They are 2.5mm thick
(~0.1"). They are also quite heavy even in unpopulated form at roughly
2/3 lbs. each. They are approximately 7" x 10". Ultimately they will
be building block modules in commercial HDTV video distribution
systems. There are nearly 1000 surface mount parts that will go on
each PCB.

Anyhow, I hope that was interesting for a few. I have to get back at it...

Cheers,
Brian
NX9O
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