Are there not published guidelines for what to use, or do we just let organizations fail? Brad KC9UQR
 
 
In a message dated 1/31/2021 10:02:08 AM Central Standard Time, wa5vjb@flash.net writes:
 
 
Hi Ray
 
So many schools/Univs want to use a Raspberry Pi in their design.
Ok for the Pi, but they don't use a proper SD card.
The Charge Pump in the SD card fails at a rather low radiation dose.
That was much of that clump of failures.
 
"Cheap parts cost too much!"
 
73  Kent WA5VJB/G8EMY
 
 
On Sunday, January 31, 2021, 09:43:48 AM CST, Ray Soifer via AMSAT-BB <amsat-bb@amsat.org> wrote:
 
 
The intent of this email is to begin a serious techncal discussion.  I do not know where it will lead.
  1.  My question is: is there something wrong with the Cubesat platform?  Its failure rate is pretty high.  If you include the university-built Cubesats which IARU has coordinated over the years, perhaps as many as half have failed upon reaching orbit.  AMSAT-NA has orbited quite a few successful communications satellites, all of which are or were larger than Cubesats.  I have been a member of AMSAT since  1969 and am not questioning its ability. Rather, my question concerns the Cubesat platform.
The AMSAT-BB reflector includes people with successful as well as unsuccessful 
Cubesats. Can we learn anything from their experience?
 
73 Ray W2RS
 


 

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