That is cool. Mouser has an eval kit all built for $50.00. Add power and stir. Bill Riches, WA2DVU ----- Hello, Time-Nutters-- Here is a link to a TI app note on using op-amps for RF. It occurred to me that this might work OK for distribution of the ref freq from a GPSDO... http://www.ti.com/lit/an/slyt102/slyt102.pdf Mike Baker