Hi I think it's pretty safe to say that the Vectron part mentioned is a VCXO with a crystal as the resonator. Indeed a ceramic resonator or an L/C resonator part would have a bit more drift and lower Q than a crystal based part. I would not try something like this with anything other than a crystal based part. At least as far as the commonly available stuff goes. I'm sure you could make it work with a hydrogen maser as the frequency source and a bit of DDS magic...
Bob On Mar 30, 2013, at 10:23 AM, Jim Lux <[email protected]> wrote: > On 3/29/13 9:01 AM, Bob Camp wrote: >> Hi >> >> Too much tuning range is easy enough to fix. Use a pot to set it on >> frequency and then hook it to the rest of the "stuff" with a fixed resistor. >> The gotcha would be if the poor thing drifts so much that it *needs* the >> wide range to stay in lock. >> >> My guess is that you could buy a hundred VCXO's at auction for less than the >> cost of trying a dozen samples. >> > > wide tuning range VCOs have lower Q resonators, so the "outside the loop BW" > noise will tend to be worse. > > The other problem I have found is that wide tuning range VCOs tend to drift > more (that is, with a constant input voltage, their frequency changes more as > they warm up or otherwise change temperature). > > It's a matter of sitting with the online order site open in one window, and > the Vectron or whoever website open to their catalog in another and going > back and forth comparing part #s.. > > > _______________________________________________ > 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.
