[eagle] Re: CAN-Do-Too! ??????????

John B. Stephensen kd6ozh at comcast.net
Tue Jul 17 12:57:28 PDT 2007


The only concern with a smaller contact would be current carrying capacity 
for the power and ground pins.

73,

John
KD6OZH

----- Original Message ----- 
From: "Chuck Green" <greencl at mindspring.com>
To: "Louis McFadin" <w5did at amsat.org>
Cc: "Dave Black ((Work))" <dblack at mail.arc.nasa.gov>; "Dave Black ((Home))" 
<dblack1054 at yahoo.com>; "David Smith" <w6te at msn.com>; "AMSAT Eagle" 
<eagle at amsat.org>; "Samsonoff at Mac. Com" <samsonoff at mac.com>; "Juan.Rivera 
((Work))" <Juan.Rivera at gd-ais.com>
Sent: Tuesday, July 17, 2007 02:47 UTC
Subject: [eagle] Re: CAN-Do-Too! ??????????


> Thanks, Lou.
>
> I don't know of any reason not to use them either.  Obviously, it needs
> to meet our mounting configuration requirement so the new mechanical
> design can meet the objectives I stated earlier.  This means it must
> mount on the edge of a PCB.  I think the HD15-D has three rows of pins
> so I'm not sure how this can work, but I haven't looked at the various
> parts available so maybe this problem has been solved.
>
> If we are going to seriously consider using HD connectors I think we
> need the blessing of AMSAT's VP of Engineering and the EAGLE project
> coordinator.  This would be true for any change that would be pervasive
> in the satellite.
>
> I am a little disappointed that there have not been any comments
> regarding the changes I saw as being made with a new design.
> Additions/changes/questions/etc.  I don't think we should do a new
> design without this discussion.  Maybe people feel these issues have
> been well covered in the past.  If so, a simple "looks good to me" would
> be helpful.
>
> And no one has stepped up to say they are well qualified and will design
> a new power supply.  Without this, I don't see a new design happening,
> but maybe.
>
> And finally, I see that no one has dared touch the subject of parts
> procurement I raised.
>
> Obviously, most of these comments are really meant for the Cc list.
>
> Thanks,
> Chuck
>
> Louis McFadin wrote:
>> Chuck,
>> Mouser has a very large selection of D-sub connectors including the
>> high density versions. Most are in stock.
>> I see no inherent reason for not using them.
>>
>> Lou McFadin
>> W5DID
>> w5did at mac.com <mailto:w5did at mac.com>
>>
>>
>> On Jul 16, 2007, at 7:19 PM, Chuck Green wrote:
>>
>>> I have had one experience with the high density D connectors.  They
>>> were much larger pin count than 9 or 15!  After someone absolutely
>>> insisted that we use them I did the board lay out.  Turned out that
>>> they were *totally* unavailable!!!  I did the board layout
>>> again@#$%&^* using standard Sub-D's.  That was a number of years ago
>>> so I would hope things have changed.  If someone is absolutely
>>> confident they can obtain the parts we need then I'm not at all
>>> opposed to using them (remember, I'm not volunteering to do parts
>>> procurement for this project; this is a good time to use someone
>>> that's good at parts procurement).
>>>
>>> While at Goddard for P3D vib test I noticed NASA satellites using
>>> standard Sub-D's.  That was also a few years ago.  Anyone know of
>>> High Density Sub-D's being used on other satellites?
>>>
>>> Chuck
>>>
>>> Bdale Garbee wrote:
>>>> On Tue, 2007-07-10 at 09:02 -0700, Chuck Green wrote:
>>>>
>>>>
>>>>> The sub-miniature D connector series has served us well.  If anyone
>>>>> has *experience* with something they think might be a better
>>>>> choice, we'd love to hear about it.
>>>>>
>>>>
>>>> At the AMSAT annual meeting that was held near Washington, D.C., a
>>>> couple of years ago (three?), someone approached me after the CAN-Do!
>>>> talk that Stephen and I gave to ask why we weren't using the
>>>> higher-density connectors that put 15 pins in the same shell size as 
>>>> the
>>>> 9-pin version of the series we have been using... and followed up by
>>>> sending me what looked like mil/aero-spec samples of such a part that I
>>>> probably still have in my basement somewhere.  I'm sorry that I can't
>>>> recall at all who that person was, but it was someone who claimed to be
>>>> using such connectors professionally with good results.
>>>>
>>>> At the time, we weren't likely to be redesigning the units any time
>>>> soon, so I didn't take any action on this suggestion.  If we're going 
>>>> to
>>>> revisit the design and think we need more than 9 pins, it might be 
>>>> worth
>>>> investigating higher density connectors like that?
>>>>
>>>> Bdale
>>>>
>>>>
>>>>
>>
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