In message <[EMAIL PROTECTED]>, David Duchscher writes: >That really is sweet. > >A couple of questions, if you have the time. The accuracy requirement >for our setup is +/- 1 millisecond, do you think the 4501 plus the >Garmin GPS unit with the standard clock crystal would be able to >meet that requirement?
No chance. Any temperature fluctuation will make it dance far more than that. You need an OCXO (or Rb) to keep it inside 1ms. >The Garmin GPS 17HVS PPS line has a >specification of +/- 1 microsecond. Secondly, do you have an idea >of what the accuracy of the such a setup would be? The GPS is actually the less critical component, as long as it has a decent PPS output. I have only used Oncore GPS, but with an OCXO that will hold solid inside 1ms. With an Rb you get to the point where calibration of cable-lengths and ethernetchips is your major source of error. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 [EMAIL PROTECTED] | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ Soekris-tech mailing list [email protected] http://lists.soekris.com/mailman/listinfo/soekris-tech
