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

John B. Stephensen kd6ozh at comcast.net
Tue Jul 17 13:18:24 PDT 2007


Their receiver module is long and skinny. Perhaps they have the RF and CAN 
bus connectors at different ends of the module.

73.

John
KD6OZH

----- Original Message ----- 
From: "Chuck Green" <greencl at mindspring.com>
To: "Bill Tynan" <btynan at beecreek.net>
Cc: "David Smith" <w6te at msn.com>; "Dave Black ((Work))" 
<dblack at mail.arc.nasa.gov>; "Dave Black ((Home))" <dblack1054 at yahoo.com>; 
"Louis McFadin" <w5did at amsat.org>; "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 15:05 UTC
Subject: [eagle] Re: CAN-Do-Too! ??????????


> Hi Bill,
>
> Yes, they are using the same device.  Both engineering and flight units
> have been delivered to them.  I have heard nothing regarding their use.
> If they have had any issues with them, they have resolved them themselves.
>
> My communications with them have been severely limited due to ITAR
> issues.  I really despise this situation and am looking forward to the
> day that I can resume my normal very good working relations with them.
> It is unfortunate that our government is such an inhibitor of technical
> development and destroyer of international relations.  Oops, I probably
> shouldn't have said that.  It's all your fault for getting me started :)
>
> Chuck
>
>
>
> Bill Tynan wrote:
>> Are P3E and P5 also using our CAN-Do widgets? If so, we should be
>> coordinating any change is design with them.
>>
>> I would think that they would have the same concerns regarding RF
>> noise as we do.
>>
>> 73,
>>
>> Bill Tynan, W3XO
>>
>> ----- 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: Monday, July 16, 2007 9:47 PM
>> 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
>>>>>>
>>>>>>
>>>>>>
>>>>
>>> _______________________________________________
>>> Via the Eagle mailing list courtesy of AMSAT-NA
>>> Eagle at amsat.org
>>> http://amsat.org/mailman/listinfo/eagle
>>
>>
> _______________________________________________
> Via the Eagle mailing list courtesy of AMSAT-NA
> Eagle at amsat.org
> http://amsat.org/mailman/listinfo/eagle 



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