In the file http://www.g4jnt.com/DownLoad/10MHz_ReferenceSpurii.pdf are plots of the 10MHz outputs from several 10MHz references and oscillators. They include four GPSDOs of varying types, an
Yes, of course. Take 5MHz input at around +10dBm, use a bi or trifilar transformer to give 0/180 deg equal amplitude ouptuts, pair of shotky diodes in classic full wave, choke to ground to complete