Bob, how can I find out what the differences among various MV89 are ? thanks Goetz
Am 28.05.2013 18:52, :
Hi The MV89A is a 5 MHz resonator doubled to 10 MHz, it will have sub harmonics that the original OCXO (using a 10 MHz resonator) does not have. The MV89A has 10 to 20 db worse phase noise as a stand alone OCXO than the original OCXO. That is masked to some degree by the TBolt's internal noise. Depending on which MV89A you get (there are many flavors), it's temperature stability will be 3X to 10X better than the modern versions of the TBolt OCXO. The ADEV on the MV89A should be ~2X better than the modern TBolt OCXO. The tuning voltage range of the original TBolt OCXO is +/- 5V on the MV89 it's 0 to 5V. The pull range on the original is about 5X greater. Both can be fiddled on the TBolt via LH. Check your TBolt board for the connection (if any) to the Vref pin on the MV89. Shorting it to ground may not be a good thing. Of course your MV89 may or may not have a voltage on the Vref pin. Bob -----Original Message----- From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf Of Frederick Bray Sent: Tuesday, May 28, 2013 10:37 AM To: time-nuts@febo.com Subject: [time-nuts] Thunderbolt MV-89a OCXO Transplant? Looking at the archive, I noticed that several months ago someone commented that the Morion MV 89A was a direct replacement for the OCXO in the Trimble Thunderbolt in the sense that the Thunderbolt PC board is configured to accommodate it. However, I wasn't able to find further details. I have a spare Thunderbolt and a spare MV89A and I am considering doing the transplant. Before I tear the Thunderbolt apart, I have a few questions: 1. Has anyone actually performed the transplant? (Does it work?) 2. Are there any significant drawbacks and advantages to the transplant? I am aware that the MV 89A may pull more current on the 12 volt line than the Trimble and that the original Thunderbolt cover will no longer fit. Thanks. Fred Bray _______________________________________________ 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.
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