I've tried both the MV89a and the Oscilloquartz 8663 (I think UCT is the same or very close) with the Thunderbolt. The Oscilloquartz does not fit any of the OCXO thru-hole combinations but the MV89a does fit one of the OCXO variations that TB accommodates. That makes for a very clean/compact replacement for the standard TB oscillator. You have to be soooo careful when wiring an OCXO off-board for ground bounce and other minute disturbances to the EFC. The MV89a as a TB on-board replacement is the only way I could get superb PPT stability out to TC=1000 sec. Even without active disciplining, either oscillator has very good long-term stability.
I have a related question, probably directed to Said, on the Fury OEM board. The MV89a seems to work ok at 10.5 V and draws ~970ma on warm-up, settling out at ~350ma at this lower supply voltage. Is that initial current draw excessive for the Fury OCXO supply? I would like to use the on-board supply so the current draw can provide the feedback for TEMPCO. I'm using NTC thermistors strapped to the OCXO case otherwise like I have done with an 10811. The current approach would seem much better correlated. Regards... Don ----- Original Message ----- From: John Miles To: 'Discussion of precise time and frequency measurement' Sent: Friday, February 10, 2012 3:28 AM Subject: Re: [time-nuts] Morion MV89 output level? > Did you ever run any tests on those UCT double oven OCXOs? Only to the extent of running a short (10-minute) HDEV test after a ~2 hour warmup, to see if it was capable of anything interesting near t=10s to t=30s. It showed about 2E-12, and the PN was nothing special, so I didn't do anything else with it. I'll leave one running for a few days and try it. >I've found > them to be freaky-stable long term. I have retrofitted a lot of Tek > DC510/5010 counters with them and after over two years, the last digit is > still right on. They would probably be good for homebrew GPSDOs, given their small size. Perhaps a Thunderbolt refit. -- john _______________________________________________ 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. _______________________________________________ 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.
