GPSDO - GPS Disciplined Oscillator

I picked up one of these  BG7TBL 10MHz GPSDO units a few months ago to replace a borrowed Rubidium based 10 MHz reference unit.  Again this BG7TBL unit is 10 MHz sine reference, with GPS receiver input to lock it to GPS satellite time signals, so that this box provides NMEA 4800Baud data, plus 10 MHz signal, plus 1PPS signal to drive other devices.  There is even a smaller, lightweight unit available now for portable operation.

http://www.qsl.net/vk2kfj/gpsdo.html