I checked all the solder joints in the area (to the extent of remaking them). Maybe there's a high resistance joint inside the mess of oxidised shellac etc inside the OCXO.
Nuvistor is NOS, and I subbed another from my reserves just to be sure (still in sealed plastic bag with perforated tear off to open) with no impact on behaviour. A ceramic alignment tool doesn't cause the same behaviour, but a probe sure does. D. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of John Miles Sent: 09 September 2008 21:08 To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] Ancient OCXO in scope calibrator. You might have an intermittent solder joint or component lead that's being flexed when you touch various points with the probe. Does a plastic alignment tool cause the same behavior? Or, more likely, there's so much loss in the circuit due to aging/component failure that it won't restart oscillating on its own without going through a power-up cycle. -- john, KE5FX _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
