Most probably this OCXO incorporazes an SC-cut crystal.Due to insufficient design it sometimes starts at the so-called B-mode which typically is some 9% above the desired C-mode. The motional resistance is abot the same, someimes even slightly lower than the resistanxe of the C-mode. It needs a careful design to assurevreliable start-up at the desired mode -which sometimes may not be the case ...Best regardsBerndDK1AGWww.axtal.com
Von meinem Samsung Galaxy Smartphone gesendet. -------- Ursprüngliche Nachricht --------Von: Iwa2008 via time-nuts <time-nuts@febo.com> Datum: 19.06.16 22:51 (GMT+01:00) An: time-nuts@febo.com Betreff: [time-nuts] Ocxo wrong frequency. <div id="AOLMsgPart_2_f94d06d3-7bcb-464b-aed2-314f90761f0a"> <div id="AOLMsgPart_2_bea72c74-0991-404a-ad92-fdbd77734860"> </div><div id="AOLMsgPart_2_bea72c74-0991-404a-ad92-fdbd77734860"> Has anyone come across oscillators outputting the incorrect frequency when powered up. The frequency that is outputted reads 10.8 Mhz, and falls a few HZ as the ocxo warms up. The frequency is stable, even when measured over the course of many hours. It is a repeatable issue, when the ocxo's are powered from 2 particular power supplies. Yet when powered on again, they give the correct frequency. The affected ocxo's are c-mac units, both nos/"ebay" used.</div><div id="AOLMsgPart_2_bea72c74-0991-404a-ad92-fdbd77734860"> </div><div id="AOLMsgPart_2_bea72c74-0991-404a-ad92-fdbd77734860">Thanks, </div><div id="AOLMsgPart_2_bea72c74-0991-404a-ad92-fdbd77734860">Brendan</div><div id="AOLMsgPart_2_bea72c74-0991-404a-ad92-fdbd77734860"> Sent from AOL Mobile Mail </div> </div> _______________________________________________ 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.
