[Halld-tracking-hw] Signal hook-up cables.

[Fernando J. Barbosa]

Hi Curtis,

Please send me the part number/specs for the terminator so we can finish 
the transition PCB and submit it for fabrication.

Thanks and best regards,
Fernando

Curtis A. Meyer wrote:
> Hi Slava -
>
>     we saw a similar issue, but noted that two things fix this.
>
> 1)  With these connectors, we can shrink the width of the transition  board
>        which opens up some space between the boards. Our estimate is 0.2 
> inches
>        off of each side.
>
> 2)  We planned to tilt the cables at 30 degrees, so they come of the 
> transition
>        board at a downward angle, and then don't collide and can start 
> bending sooner.
>        This also eliminates the possible collisions with the neighboring 
> boards.
>
>                                 /###
>                               /    /  ###
>         =========/==/===  ###
>                                                  ###
>                            30 degrees          ###
>                              -----------------------
>
>      Curtis & Gary
>
> On 4/20/11 2:20 PM, Vladislav Razmyslovich wrote:
>   
>> Hi Curtis,
>>
>> I have checked the possibility of soldering Signal hook-up cables to 
>> the transition boards, and found some problems. At first, after an 
>> attaching the terminator to the cable, we will get the rigid end with 
>> length equal 1" or so.  Plus an additional length for bending part of 
>> cable. Finally we will get 1.25"-1.30" length that can not accommodate 
>> easily in a row of places - see attached files. Unfortunately, we have 
>> a lot of places on a CDC HV boards layout where the space between 
>> neighbour transition boards egual .31" - .39" min. Based on that, I 
>> guess the soldering process will be  extremely hard, and  for some 
>> places will be impossible. Due these problems the your's previous 
>> version looks more preferable. Or we should search an another 
>> solution. Maybe my opinion is not fully correct, but an additional 
>> checking this issue by you and your team will be important.
>>
>> Thanks and best regards,
>>
>> Slava
>>
>> On 4/20/2011 10:06 AM, Curtis A. Meyer wrote:
>>     
>>> That appears to be ok based on our initial tests. Also, being able to
>>> come up from the
>>> bottom of the board can help.
>>>
>>>      Curtis
>>> On 4/20/11 10:00 AM, Fernando J. Barbosa wrote:
>>>       
>>>> Hi Curtis,
>>>>
>>>> Is there enough space to use these terminators, considering the bend
>>>> radius?
>>>>
>>>> Best regards,
>>>> Fernando
>>>>
>>>> Curtis A. Meyer wrote:
>>>>         
>>>>> Hi Everyone -
>>>>>
>>>>>      I have attached a picture of the coax connector we want to use to
>>>>> connect the
>>>>> wires to the the transition board. While we do not have a rating from
>>>>> the manufacturer,
>>>>> we tested this to 7500V (the maximum of our local supply) without a
>>>>> problem. In fact,
>>>>> this was higher than the simple soldered connections.
>>>>>
>>>>>      We also believe that the use of these connectors will
>>>>>
>>>>> 1)  Reduce the time to manufacture the cables by quite a bit, thus
>>>>> saving
>>>>>       money there.
>>>>>
>>>>> 2) Reduce the time it takes to make the solder connections to the
>>>>> transition
>>>>>      board, thus saving money there.
>>>>>
>>>>> 3) Provide a more robust connection to the transition board that
>>>>> could actually
>>>>>      be unsoldered if we needed to.
>>>>>
>>>>> 4) Essentially protects most of the transition board region from
>>>>> exposed high voltages
>>>>>      and sharp edges.
>>>>>
>>>>> 5) Allows us to have the two soldered pins either go down through the
>>>>> top of the
>>>>>      transition board, or come up through the bottom. This will allow
>>>>> us to make some
>>>>>      wires shorter than they would need to be other wise.
>>>>>
>>>>>      The cost of these parts is about 13k$, but we think that the
>>>>> above savings and benefits
>>>>> will more than pay for this. Unless there are serious complaints, we
>>>>> are going to order
>>>>> ~3700 of these this week. There is a six-week delivery on them.
>>>>>
>>>>>         Curtis
>>>>>
>>>>>
>>>>> ------------------------------------------------------------------------ 
>>>>>
>>>>>
>>>>> ------------------------------------------------------------------------ 
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> Halld-tracking-hw mailing list
>>>>> Halld-tracking-hw at jlab.org
>>>>> https://mailman.jlab.org/mailman/listinfo/halld-tracking-hw
>>>>>           
>
>
>   
-------------- next part --------------
A non-text attachment was scrubbed...
Name: barbosa.vcf
Type: text/x-vcard
Size: 188 bytes
Desc: not available
Url : https://mailman.jlab.org/pipermail/halld-tracking-hw/attachments/20110427/2252c562/attachment.vcf