Date: Sun, 30 Jan 2000 15:56:15 +0900 (JST)
From: Andrew Stachyra <stachyra@suketto.icrr.u-tokyo.ac.jp>
To: Hans-Gerd Berns <berns@phys.washington.edu>

Hi Hans,

[... unrelated items deleted ...]

I have a few things to say about what I have already learned in the
process of installing the boards:

1.) The jumper in Hut 1, Crate 1, Paddle Card 1, Channel 8 (this
is assuming they are numbered 0 to 8, from top to bottom on the board,
which I think is correct, but am not sure) was some kind of circuit
element, not just a wire.  I don't know what the jumper was.  I asked
Dean Takemori, and he thought it might have been a diode.  Anyway, keep
an eye on this channel in particular and see if you notice any funny
behavior.

2.) Because of the fact that the HV connectors on the back of your
board are more spaced out than the ones in the original design, your
board rests differently against the back of the crate than in the
original design.  In the case of the original design, the edge of the
printed circuit board rests flush against two railings (one across the top 
and one across the bottom) at the back of the crate.  In the case of your
board, it is the back side of the HV connector which sits flush against
the railings, and this pushes the board out of the crate
by an additional 1.5 or 2 inches (the length of the HV connector)
beyond the extra 2 or 3 inches that you designed into your new 
boards.  The result is that the front edges of your boards protrude
about 4 or 5 inches beyond the front of the crate.

The good news is that the crates for the paddle cards appear to have
been homemade at the LSU machine shop, and fit together with screws,
so you can take them apart, add some additional pieces, and put
them back together in a geometric configuration which is best
suited to your version of the cards.  I would suggest that you might
consider adding some sheet metal extender tabs to the side walls of the
crate which will place the railings 2 or 3 inches further back (to
accomodate the extra depth of your boards) and 0.5 to 1 inch further 
apart (to accomodate the extra width of the 12 HV connectors).

Cheers,
Andy