Hi Bill, thanks for sending the datasheets. Looks like the unit has nominally +/-6Hz EFC range, slightly less than the OCXO's we typically use. I would thus try increasing the DAC Gain to about 30 to 40 and see how that works. bye, Said In a message dated 11/2/2008 18:06:18 Pacific Standard Time, wb6bnq@cox.net writes: Said, Find attached two PDF files of the specs, drawing and pinout for the Isotemp 134-10. Bill....WB6BNQ _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.