[time-nuts] Accurate Thunderbolt position
Mark Sims
holrum at hotmail.com
Mon Jul 13 23:15:45 UTC 2009
I spent several hours trying to find out why I started getting longitude number that were way off. Everything seemed to be working properly, but the tbolt was reporting longitude numbers way off from the surveyed position.
I thought that my attempts to feed it an accurate lunch had gotten the unit into some bogo-state. Did a power cycle and factory reset and new self survey. Still got bogo-longitude. Curse you John Harrison!
Turns out I had the wrong tbolt connected... the surveyed point in the front yard has a very close latitude to the rooftop antenna, but off by around 70 feet in longitude. All them serial cables look alike. D'oh!
----------------------
An equally creative solution -- just move the antenna a
few feet in whatever direction you need equal the value
of the single precision number ;-) I can see your deck
now - with an old CNC XYZ head and a GPS antenna...
_________________________________________________________________
Windows Live™ Hotmail®: Find, add, and share the best celeb pics, right from Hotmail. Check it out.
http://www.windowslive.com/Online/Hotmail/Campaign/QuickAdd?ocid=TXT_TAGLM_WL_QA_HM_celebrity_photos2_072009&cat=celebrity
More information about the Time-nuts_lists.febo.com
mailing list