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

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

Hi Tim,

    That's exactly what I was asking for. Somehow, I never got this table.

Thanks so much,
Fernando




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.
>>
>>
>> Gerard Visser wrote:
>>> Hi Fernando,
>>>     I'm not sure if you're asking about this - but I don't believe 
>>> there is any hard constraint from the electronics design that we are 
>>> approaching yet with 21 m cable lengths. I have a (hastily designed) 
>>> equalization circuit working with a 21 m cable and it has about 11.7 
>>> bits of dynamic range and ~7 ns risetime, it should be enough. I 
>>> don't think we could have 100 m cable, but I think anything less 
>>> than 25 m is certainly reasonable.
>>>     To design and test, though, I believe we want to get to more 
>>> specific planning of the lengths now (or as soon as practical). That 
>>> was my main point.
>>>
>>>     Gerard
>>>
>>> Fernando J. Barbosa wrote:
>>>> Hi Gerard,
>>>>
>>>>     Yes, we really need to have a table like the one you suggest. 
>>>> It is
>>>> especially important to know the maximum lengths given the constraints
>>>> on shaping, gain and dynamic range for both the fADC-125 and the ASIC.
>>>>
>>>> Regards,
>>>> Fernando
>>
>>
>>
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