Cesium.... this IS time nuts after all... <big grin> ______________________ Clay Autery, KY5G MONTAC Enterprises (318) 518-1389 On 7/15/2016 8:55 PM, Bob Camp wrote: > Hi > > As this is going, it’s not a clock at all. It’s a GPSDO with a Nixie display on it > and now with IRIG timing output. > > Do we put an Rb in it or go straight to a Cesium? > > Bob