I did some measurements on the Trimble using a TAPR TICC. The "PPS" adevs are the Trimble and the "OSC" adevs are an Oscilloquartz STAR-4. http://www.eevblog.com/forum/projects/a-look-at-my-symmetricom-gpsdo-(ocxo-furuno-receiver)/msg1143960/#msg1143960 ------------------- >Has anyone on the list used a GPSDO like Don's?