Hal, A pendulum oscillator is not that different. Basically it is a quartz oscillator that is pulled by an electronic circuit, not unlike a VXVCO. As any crystal does, it ages as it sits around, and depending on how well it follows the characteristic curve for that particular unit the sooner it will come into the proper frequency. The algorithms used in the VP are quite slow, so if the frequency has drifted a lot you can spend a long time waiting for the receiver to behave itself. Failing to wait for the receiver can cause you to toss what is otherwise a working unit.
Note that this is not necessarily more than a "normal" quartz oscillator. I can tell you some horror stories about supposedly "Good" crystals that didn't even come close to meeting their advertised aging characteristics. They all worked fine when they came off the assembly line, but had almost random drift characteristics over time. Randy ____________________________________________________________________________ _________ What is a "pendulum oscillator", and what changes while one is sitting idle? Why does it change more than a normal quartz oscillator? -- These are my opinions, not necessarily my employer's. I hate spam. _______________________________________________ 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. _______________________________________________ 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.
