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

[Tim Whitlatch <whitey@jlab.org>]

Again, I believe the 18 m is more realistic.

Tim

Fernando J. Barbosa wrote:
> 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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