Chuck:
I thought I remembered that they are using them as well, but I was out of the Eagle loop for a number of months. Just got back in in time to see all the EMI problems being unearthed.
Yes, ITAR is %$&@ nuisance. I tried to do something about it 6 years ago, but Sept. 20, 2001 (9 days after 9/11) was the wrong time to begin.
Our DL friends are certainly aware of the EMI situation our folks have uncovered.
73, Bill
----- Original Message ----- From: "Chuck Green" greencl@mindspring.com To: "Bill Tynan" btynan@beecreek.net Cc: "Louis McFadin" w5did@amsat.org; "Dave Black ((Work))" dblack@mail.arc.nasa.gov; "Dave Black ((Home))" dblack1054@yahoo.com; "David Smith" w6te@msn.com; "AMSAT Eagle" eagle@amsat.org; "Samsonoff@Mac. Com" samsonoff@mac.com; "Juan.Rivera ((Work))" Juan.Rivera@gd-ais.com Sent: Tuesday, July 17, 2007 10:05 AM Subject: Re: [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@mindspring.com To: "Louis McFadin" w5did@amsat.org Cc: "Dave Black ((Work))" dblack@mail.arc.nasa.gov; "Dave Black ((Home))" dblack1054@yahoo.com; "David Smith" w6te@msn.com; "AMSAT Eagle" eagle@amsat.org; "Samsonoff@Mac. Com" samsonoff@mac.com; "Juan.Rivera ((Work))" Juan.Rivera@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@mac.com mailto:w5did@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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