Groups > sci.electronics.design > #519332

Re: various OTs

From	<698839253X6D445TD@nospam.org>
Newsgroups	sci.electronics.design
Subject	Re: various OTs
Date	2018-10-15 07:23 +0000
Organization	Aioe.org NNTP Server
Message-ID	<pq1fa1$u70$1@gioia.aioe.org> (permalink)
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Steve Wilson wrote
>John Larkin <jjlarkin@highland_snip_technology.com> wrote:
>
>> It's tough to get stuff to work in space. Probably even tougher to
>> figure out what went wrong.
> 
>As I understand, gyros use sealed gas bearings and very thin conductors to 
>drive the motors. Here's some more information (old)
>
>https://forum.nasaspaceflight.com/index.php?action=dlattach;topic=
>32804.0;attach=542152
>
>Apparently the new mems gyros would be more reliable:
>
>https://www.siliconsensing.com/technology/mems-gyroscopes/
>
>Apparently some models are super-sensitive and require recalibration due to 
>changes in G due to the moon's gravity.

Ha, I ran a test with the MEMS with a very precisely controlled temperature
to see if I could see correlation with the moon phases...
Published that in some related group few years ago.
The idea was to replace GPS with an inertia based system.
Did not get to see the effect of the moon, but noted daily variations
very likely due to chip expansion and board expansion caused by minuscule temperature changes.
concluded that I needed a better oven.
Then somebody at some university repeated it with a better oven.
It is out there can search for the graph, lemme see
 http://panteltje.com/pub/xgc.gif

The spike is where I opened the box to check some switches...
At least when those sats fail I know where to pick up...

Its fun. so many things to get into...

Thread

various OTs John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-12 12:50 -0700
  Re: various OTs George Herold <gherold@teachspin.com> - 2018-10-12 13:04 -0700
    Re: various OTs John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-12 13:48 -0700
      Re: various OTs George Herold <gherold@teachspin.com> - 2018-10-12 17:46 -0700
  Re: various OTs dplatt@coop.radagast.org (Dave Platt) - 2018-10-12 14:53 -0700
    Re: various OTs John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-12 15:30 -0700
      Re: various OTs Martin Brown <'''newspam'''@nezumi.demon.co.uk> - 2018-10-13 10:13 +0100
        Re: various OTs John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-13 09:33 -0700
          Re: various OTs Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-13 14:15 -0400
          Re: various OTs Martin Brown <'''newspam'''@nezumi.demon.co.uk> - 2018-10-15 10:09 +0100
            Re: various OTs John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-15 06:50 -0700
    Re: various OTs Clive Arthur <cliveta@nowaytoday.co.uk> - 2018-10-13 10:37 +0100
      Re: various OTs DecadentLinuxUserNumeroUno@decadence.org - 2018-10-13 10:01 +0000
        Re: various OTs John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-13 11:08 -0700
      Re: various OTs John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-13 09:55 -0700
      Re: various OTs MikeP <mjp993@googlemail.com> - 2018-10-16 03:22 +0000
    Re: various OTs Robert Baer <robertbaer@localnet.com> - 2018-10-13 22:39 -0700
      Re: various OTs Sjouke Burry <burrynulnulfour@ppllaanneett.nnll> - 2018-10-14 21:43 +0200
        Re: various OTs Robert Baer <robertbaer@localnet.com> - 2018-10-15 19:46 -0700
  Re: various OTs DecadentLinuxUserNumeroUno@decadence.org - 2018-10-12 23:55 +0000
    Re: various OTs Lasse Langwadt Christensen <langwadt@fonz.dk> - 2018-10-12 16:58 -0700
    Re: various OTs bill.sloman@ieee.org - 2018-10-12 17:52 -0700
    Re: various OTs speff <spehro@gmail.com> - 2018-10-18 06:53 -0700
      Re: various OTs John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-18 06:59 -0700
        Re: various OTs tabbypurr@gmail.com - 2018-10-18 14:10 -0700
          Re: various OTs "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-18 17:49 -0500
        Re: various OTs Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-18 21:04 -0400
          Re: various OTs Steve Wilson <no@spam.com> - 2018-10-19 01:34 +0000
            Re: various OTs <698839253X6D445TD@nospam.org> - 2018-10-19 07:11 +0000
  Re: various OTs "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-12 19:10 -0500
    Re: various OTs Lasse Langwadt Christensen <langwadt@fonz.dk> - 2018-10-13 06:22 -0700
      Re: various OTs Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-13 14:16 -0400
        Re: various OTs John Larkin <jjlarkin@highlandtechnology.com> - 2018-10-13 17:19 -0700
    Re: various OTs whit3rd <whit3rd@gmail.com> - 2018-10-13 12:24 -0700
      Re: various OTs Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-13 17:30 -0400
        Re: various OTs Jasen Betts <jasen@xnet.co.nz> - 2018-10-14 20:13 +0000
          Re: various OTs John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-14 13:59 -0700
            Re: various OTs Steve Wilson <no@spam.com> - 2018-10-14 23:58 +0000
              Re: various OTs Steve Wilson <no@spam.com> - 2018-10-15 01:05 +0000
                Re: various OTs Jasen Betts <jasen@xnet.co.nz> - 2018-10-15 05:57 +0000
                Re: various OTs DecadentLinuxUserNumeroUno@decadence.org - 2018-10-15 11:09 +0000
              Re: various OTs <698839253X6D445TD@nospam.org> - 2018-10-15 07:23 +0000
      Re: various OTs "Tim Williams" <tiwill@seventransistorlabs.com> - 2018-10-13 21:39 -0500
  Re: various OTs bitrex <user@example.net> - 2018-10-13 00:08 -0400
  Re: various OTs <698839253X6D445TD@nospam.org> - 2018-10-13 06:59 +0000
    Re: various OTs John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-13 12:08 -0700
  Re: various OTs <698839253X6D445TD@nospam.org> - 2018-10-13 07:27 +0000
    Re: various OTs speff <spehro@gmail.com> - 2018-10-18 06:55 -0700
  Re: various OTs Winfield Hill <hill@rowland.harvard.edu> - 2018-10-13 07:32 -0700
    Re: various OTs John Larkin <jjlarkin@highland_snip_technology.com> - 2018-10-13 12:17 -0700
  Re: various OTs Joseph Gwinn <joegwinn@comcast.net> - 2018-10-15 08:37 -0400
    Re: various OTs Martin Brown <'''newspam'''@nezumi.demon.co.uk> - 2018-10-15 13:58 +0100
      Re: various OTs Tom Gardner <spamjunk@blueyonder.co.uk> - 2018-10-15 14:34 +0100
      Re: various OTs Clifford Heath <no.spam@please.net> - 2018-10-16 10:26 +1100
    Re: various OTs Clive Arthur <cliveta@nowaytoday.co.uk> - 2018-10-16 10:46 +0100
      Re: various OTs tabbypurr@gmail.com - 2018-10-16 08:46 -0700
        Re: various OTs Clive Arthur <cliveta@nowaytoday.co.uk> - 2018-10-16 19:53 +0100
          Re: various OTs tabbypurr@gmail.com - 2018-10-17 05:56 -0700

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