[time-nuts] Lars GPSDO on EEVblog

Mark Sims holrum at hotmail.com
Sat Sep 8 13:18:31 EDT 2018


Lady Heather now has some partial support for the Lars GPSDO.   It does not directly send any commands to the device (I don't have one yet to implement that), but you can use the !u or !t keyboard commands to do that,

Heather treats the Lars GPSDO as a time interval counter.  You need to start Heather with /rxi (time interval counter as input device) and /itl (interval counter device is a Lars GPSDO).

You can also use the Lars GPSDO as an "extra" input device with the GPS receiver as the main input device (/ei=port /itl).  This mode lets Heather calculate true ADEV values while monitoring the GPS receiver.

When using the Lars GPSDO, you do want to manually set the DAC gain setting (&g) so that the frequency calculations based on the DAC setting are  accurate.


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