Re: Cable length [was: Contact Information for Electronics]

[Elke-Caroline Aschenauer <elke@jlab.org>]

On Tue, 27 Nov 2007, Fernando J. Barbosa wrote:

Dear all,

I can only agree with Fernando, to have different cable length for each
FDC package seems really not a good idea. concerning the same length for
the fdc and cdc, I would have less strong feelings, but if there are big
differnences in lenght which would influence the settings for the
electronics, than we should rethink as it makes to keep track on spreas
much harder.

cheers elke



> Date: Tue, 27 Nov 2007 09:36:31 -0500
> From: Fernando J. Barbosa <barbosa@jlab.org>
> To: Gerard Visser <gvisser@indiana.edu>
> Cc: Tim Whitlatch <whitey@jlab.org>, Joe Beaufait <beaufait@jlab.org>,
>      FDC email list <halld-tracking-hw@jlab.org>
> Subject: Re: Cable length  [was: Contact Information for Electronics]
>
> Hi Gerard, Tim and Joe
>
>     From a cost, manufacturing and installation stand point, let me
> suggest we keep the lengths the same for each of the CDC and FDC
> detectors, or maybe both. Different cable lengths also imply different
> shaping constants and one fADC-125 model/rev would be preferable.
>
> Regards,
> Fernando
>
>
>
>
> Gerard Visser wrote:
> > Hi Tim, Joe,
> >     Thanks, this is good information - especially that it includes all
> > the detectors. But I still have the question, what will the range of
> > cable lengths for FDC and CDC be? The longest FDC cables, according to
> > this table, are 52 feet. What proportion of the FDC cables have that
> > length? What is the length of the shortest FDC cable? There is no
> > electrical reason to match the lengths exactly, but of course this is
> > an option, if you have tray space for it. Please let me know your
> > thoughts on these questions... Thanks,
> >
> >     Gerard
> >
> > Tim Whitlatch wrote:
> >> I have attached a table we made last year showing the cable lengths.
> >> These are based on already installed configuration. Joe has added 7' to
> >> the numbers. This is good since there will be additional length needed
> >> for installing the FDC and CDC. This of course should be revisited for
> >> the final assy.
> >>
> >> Cheers,
> >>             Tim
> >>
> >> Joe Beaufait wrote:
> >>> The longest run calculation done on autocad showed 52 ft, I made the
> >>> test cables 59' or 18 meters. the 3m connectors are difficult and I
> >>> would suggest sending assemblies out for construction.
> >>> the cables I delivered today are not guaranteed.
>

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