Look up PA3AKE, he built a 1 GHz source clock, Martein also provides a substantial amount of research data.
Good luck for the new year. Gerald VK3GJM Sent while out and about Begin forwarded message: From: Anders Wallin <anders.e.e.wal...@gmail.com<mailto:anders.e.e.wal...@gmail.com>> Date: 31 December 2013 2:56:03 AEDT To: Discussion of precise time and frequency measurement <time-nuts@febo.com<mailto:time-nuts@febo.com>> Subject: [time-nuts] sysclock source for AD9912 DDS? Reply-To: Discussion of precise time and frequency measurement <time-nuts@febo.com<mailto:time-nuts@febo.com>> I've tested the AD9912 evaluation board: http://www.anderswallin.net/wp-content/uploads/2013/12/dds_test_2013-12-30.png I want to use it with a 10MHz external input clock, but it looks like the on-board PLL that generates a 1200MHz sample clock from my input isn't that great, since I get strong side-bands on the output that are only 18-20 dB down from the fundamental. So it looks like I need to supply a clean 800-1000MHz clock to the DDS to get a clean output. Any ideas/suggestions for generating this from a 10 MHz sine? Driving the DDS system clock from an expensive RF generator (e.g. HP 8648A) would be possible but I'd prefer a PLL from 10MHz if it's doable simply/cheaply. Anders _______________________________________________ time-nuts mailing list -- time-nuts@febo.com<mailto:time-nuts@febo.com> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. -- Message protected by MailGuard: e-mail anti-virus, anti-spam and content filtering.http://www.mailguard.com.au/mg _______________________________________________ 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.