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

["Fernando J. Barbosa" <barbosa@jlab.org>]

Hi Gerard,

    Sounds good. I got 3 cables from Joe and they are 18 m, per Joe's email.

Regards,
Fernando




Gerard Visser wrote:
> Hi Elke, Fernando,
>     I am completely fine with this point of view - it simplifies 
> everything, one (or maybe two, FDC+CDC) design for the ADC board 
> (equalization filter component values), one design of cable assembly 
> to order. [By the way I think Joe's statement is right on the mark, 
> that we don't want to assemble those connectors ourselves, it is 
> better to have that done by a cable assembly vendor]. The only caution 
> is, people planning the cable trays need of course to allow space for 
> the extra cable - let's be sure not to forget this small point.
>     I will carry on assuming now a single cable length for all of FDC, 
> 21 m (though we expect actual 16 m according to the table from Tim, it 
> is better to do the testing under a worst-case condition). Similarly 
> for CDC we expect actual length of 14 m, I suggest that the test 
> cables (for chamber/preamp/cable/ADC prototyping) are made with a 
> length of 18 m.
>     Thanks,
>
>     Gerard
>
> Elke-Caroline Aschenauer wrote:
>> 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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