Hello, Thanks for the great discussions on this group, and the work of all who brought Lady Heather to us. I hope it is acceptable to ask some newbie questions? What works: Lady Heather installs, connects, and runs fine. I’m comfortable with the command line interface. What I’m curious about: Where can I get more information about some of the abbreviation on the main screen? For example: Tcor (corrected time?) UNC (?) I searched w/o success for those terms on the web, within this group archives, and in, for example, HP Zxxx manuals. I’m also curious about my specific GPSDO. It is a Symmetricom, inside a small enclosure with a display ($150 / eBay). Specifically, even though I am not sure what UNC is, my guess is that 63k us (= 63 ms) is not good. Still, my (uncalibrated) Tek scopes and Agilent frequency meter say it is “10 MHz” TFOM looks OK (@ 2) I’ve not measured the cable length I’ve had the GPSDO connected for maybe 24 hours. Thank you for considering. Scott W7SLS PS: Not sure whether a screen shot will make it to the group, but here goes. PPS: Yes, I obscured the specific lat/lon (but yes, I know there is enough info to find out anyway) PPPS: house blocks Northern sky