[time-nuts] Accurate Thunderbolt position

Mark Sims holrum at hotmail.com
Thu Jul 16 17:39:10 UTC 2009


More adventures in the subtle wonders of Thunderbolt firmware...

My idea to get a Thunderbolt to accept a high precision fixed position by putting it into 3D fix mode,  waiting for it to generate a fix sufficiently close to the desired location,  and then putting it into position hold mode...  is a bust.   Position hold mode reverts to the last saved/surveyed position.

Ok,  so let's try doing single fix surveys until one comes close to the desired position...  no joy.  The Tbolt documentation says that you can do surveys from 1 to 2**32-1 fixes...  nope.  Firmware rev 2.22 only seems to do 1400 point surveys.  Rev 3.0 only does 2000 point surveys.  The units seem to ignore the fix count parameter in the "set survey parameters" command.   Does anybody know how to set the self-survey fix count value?
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