[Halld-tracking-hw] cable strip length

[Fernando J. Barbosa]

Hi Curtis,

The file, about a year old, is attached. Page 1 shows the connections.

Best regards,
Fernando



Curtis A. Meyer wrote:
> Email is a terrible filing system. Could you resend that drawing?
>   thanks -- curtis
> Fernando J. Barbosa wrote:
>> 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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