[time-nuts] Lady Heather for homebrew GPSDO

Tom Van Baak tvb at LeapSecond.com
Sun Dec 18 21:56:01 EST 2016

Hi Jim,

> --The EFC value is given as an integer percent -100 to 100, so there is not
> enough resolution to really tell what the DAC is doing.

Sounds like you're using :DIAG:ROSC:EFC:REL? which gives percent.
Instead try :DIAG:ROSC:EFC:ABS? which gives absolute DAC value.

> -- It does not have the satellite position and C/N data that is reported in
> the NMEA GSV sentence, so LH can't make its nice satellite plots.

Use the SS column of :SYST:STAT? for this.

Remember before LH there was GPScon. See tons of information on the Z3801A at:


This random one has nice examples of what you can do given the data from SCPI:


If Mark is looking for a winter project, he can turn LH into this:



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