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[Gerard Visser <gvisser AT indiana.edu>]

Dear Jianing and Maowu,
	Having looked so far only at the summary slides -- thanks for those! -- I have 
a few comments here.

	Could you please show (in an auxiliar 'mechanical' gerber layer) the outline of 
the mounting hardware (maximum extent of it) where it touches the board. *Or 
alternatively* you could say that you are absolutely sure that the hardware does 
not overlap any copper on same side of the board. I can see you made changes in 
this that look quite good, but I cannot tell exactly if they're good enough. 
[Perhaps this will be clearer if I go look also at the connector datasheet, I 
know. But it may be best to show the constraints in your drawing.]

	More significantly, I think you have not yet addressed the issue of mounting 
location and tolerance of mounting location of the T-board which is constrained 
as Zhenyu explained by outer hybrid connector location. This has to be 
accomodated somehow in the mounting holes of the T-board. A change is required, 
as far I understand.

	We should be informed from Rahul & Felix whether those four big holes on the 
left are needed in any way for cable fixing. (I guess probably not.) I think 
they should be deleted if they're really not going to be used.

        Thanks, sincerely,

                Gerard


On 8/14/2020 2:14 AM, nie wrote:
> Hi Gerard and all,
>
> Thanks for the information.
> We just finished the new design on T-board & hybrid.
> The updated version can be found in the wiki page:
> https://wiki.bnl.gov/star/index.php/Hybrid_and_T-board
>
> I also make a summary slide which covers all the changes:
> https://drupal.star.bnl.gov/STAR/system/files/20200814_hybrid%2526Tboard_redesign.pdf 
>
>
> Comments and suggestions are welcome.
>
> Thanks,
> Maowu&Jianing
>
>
> 在 2020-08-13 10:52，Gerard Visser 写道：
> > hi Maowu and Jianing,
> >     I think those four big holes don't really serve a purpose -- however
> > I'd also say that we haven't seen all the details of how the cable
> > will be routed and secured along the aluminum mounting ring so maybe
> > it is premature to say these holes don't help.
> >     It would be best to delete them if they really don't have a purpose.
> >     The jumper can be deleted, the bias lines will not be tied together
> > on T-board nor elsewhere. Let's delete the jumper.
> >     The two new 24 AWG ground wire soldering holes, maybe should be in
> > the right half of the board as seen in your picture? Is that feasible?
> > I think it may work out a little neater if they are a little bit away
> > from the cable wire holes. But we can consider any good options.
> >     Sincerely,
> >
> >         Gerard
> >
> >
> > p.s. I am reminded from your picture that two of the four existing
> > mounting holes for the T-board are very near an edge. When things are
> > refigured as necessary to allow for the tolerance of position of the
> > outer hybrid's connector, maybe this will be a problem and maybe the
> > size of the T-board has to be increased a little along that edge. I
> > hope that the requirements about the outer hybrid connector w.r.t. the
> > four mount points on the mechanical structure for the T-board can be
> > defined in a drawing soon?
> >
> >
> >
> > On 8/12/2020 10:16 PM, Maowu Nie wrote:
> > > Hi all,
> > >
> > > We are working on the re-design of T-board now. We want to know if the four 
> > > holes (red circle) are used or not. if not, Jianing plan to remove these 
> > > holes, then we have more space to place two GND holes as Gerard suggested, 
> > > and also we can move the jumper (J1) far away from the purple cable.
> > >
> > > The four holes are initially designed for fixing the purple cable, since they 
> > > are not used, we suggest to replace them as GND holes.
> > >
> > > Please correct us if we are wrong.
> > >
> > > Thanks,
> > > Maowu & Jianing
> > >
> > >
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