[Halld-tracking-hw] cable strip length

[Fernando J. Barbosa]

Hi Curtis,

According to Slava, it is not possible to place all the connectors as 
there is no space for 3 or 2 wire diameters between the connectors.

I was just reminded by Gerard that I sent you a drawing some time ago 
with the cables soldered to a PCB that fit between the pins on the 
connector. The cables would be on the same plane as the HVB rather than 
perpendicular to it. In this manner, you have a lot of space between the 
connectors and it may be easier for installation. The 0.25" crimp tubes 
should also work well here.

Best regards,
Fernando

Curtis A. Meyer wrote:
> Hi Fernando -
>
>  the following link shows some pictures of wires hooked up (towards 
> the bottom):
>
> http://www.jlab.org/Hall-D/software/wiki/index.php/CDC_Electrical_Hook_Up_Photos 
>
>
> looking at these, it looks more like three wire diameters to get them 
> bent unless we can
> come up with something else clever (an l-shaped draid holder?)
>
>   curtis
> Fernando J. Barbosa wrote:
>> Hi Curtis,
>>
>> Thanks for the reply. It will be hard to find anything for the braid 
>> to be less than the length you already have. With a requirement of 
>> about 1.2 cm for the soldering and allowing 2 wire diameters for the 
>> bending, the required space on both sides of the connector becomes 
>> 1.2 cm + 5 mm = 1.7 cm. Would 2 wire diameters work? Should Slava 
>> consider 2 cm?
>>
>> Thanks and best regards,
>> Fernando
>>
>>
>>
>> Curtis A. Meyer wrote:
>>> Hi Fernando -
>>>
>>>     based on your references, we found a reasonably priced tool that
>>> can set any length of strip you want. Assuming the following represents
>>> the end of the wire:   A is the stripped length of the conducting 
>>> core, B
>>> is the length of the teflon insulator and C is the stripped length 
>>> of the outer
>>> braid.
>>>
>>>                                                      
>>> eeeeeeeeeeeeeeeee      teflon
>>>                                         bbbbbbbbbbbbbbbbbbbbbb     
>>> braid
>>>                                eeeeeeeeeeeeeeeeeeeeeeeeeeeeee     
>>> teflon
>>>                       xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx    conducting 
>>> core
>>>                                 eeeeeeeeeeeeeeeeeeeeeeeeeeeeee    
>>> teflon
>>>                                          bbbbbbbbbbbbbbbbbbbbbb   braid
>>>                                                      
>>> eeeeeeeeeeeeeeeeee    teflon
>>>
>>>                      |-- A--|-- B --|-- C -- |
>>>
>>> The standard stripper we had set A=B=C=6mm. This is no longer 
>>> necessary,
>>> but we need some feel for what reasonable lengths are. We could 
>>> probably solder
>>> with A=3mm. The insulation on B probably needs to be of similar 
>>> length (3-4mm),
>>> and then the question comes to the outer braid.
>>>
>>> Currently, we are using some crimp on tubes to help solder to the 
>>> board. The only
>>> length that we are able to find for these is 6mm. If someone knows 
>>> of a source of
>>> shorter pieces that are not outrageously expensive, that would 
>>> control this length.
>>> Lacking that, it appears that our current solution would need C=6mm.
>>>
>>> The above dimensions have a PC board that extends about 1.2 to 1.3 
>>> cm beyond
>>> the connector on both sides of the connector. It is also important 
>>> to note that the
>>> wires themselves extend beyond the board as it takes some space to 
>>> bend them
>>> through 90 degrees so that they can go through the swiss cheese plate.
>>>
>>> That all said, I think that there is some hope of shortening C if an 
>>> appropriate
>>> part can be obtained.
>>>
>>>   - Curtis
>>>
>>> Fernando J. Barbosa wrote:
>>>> Hello everyone,
>>>>
>>>> I need to know what is your final spec for the stripping of the 
>>>> coax. This is needed before Slava can proceed with the final 
>>>> placement of the preamp connectors due to spacing.
>>>>
>>>> Best regards,
>>>> Fernando
>>>
>>>
>
>
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