[time-nuts] Ocxo wrong frequency.

BNeubig at t-online.de BNeubig at t-online.de
Sun Jun 19 17:34:18 EDT 2016


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


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-------- Urspr√ľngliche Nachricht --------Von: Iwa2008 via time-nuts <time-nuts at febo.com> Datum: 19.06.16  22:51  (GMT+01:00) An: time-nuts at febo.com Betreff: [time-nuts] Ocxo wrong frequency. 

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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">
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