In China they do it differently from what we do here: they "tame" the oscillator, and sometimes they "discplined" it as well :) In a message dated 11/18/2014 15:24:12 Pacific Standard Time, golgarfrincham at gmail.com writes: http://www.ebay.com/itm/GPS-DISCPLINED-CLOCK-GPSDO-10M-OUTPUT-SQUARE-WAVE-/1 11514491254