My HP-103AR frequency standard has a similar problem. I have been advised to take it apart and replace one of the capacitors in order to bring the frequency back into the range of adjustment. Sounds like you have the same problem.
Jeremy On Fri, Dec 8, 2017 at 7:52 AM paul swed <paulsw...@gmail.com> wrote: > I took a quick look at the spec sheet. > It appears coarse adjustment is an option M and would actually be a pot. > That speaks to another tuning diode for coarse? Or a pot on pot > arrangement. > That sounds ugly. > Regards > Paul > WB8TSL > > On Fri, Dec 8, 2017 at 10:17 AM, Bob kb8tq <kb...@n1k.org> wrote: > > > Hi > > > > It is quite possible that nothing is actually broken and that the crystal > > has simply drifted > > outside the tuning range. It should be pretty easy to spot the coarse > > tuning device once > > the package is open. I would bet you will find a selected capacitor > across > > the coarse tune or in > > series with the coarse tune. Changing the value of that cap should bring > > things back on > > frequency. I would avoid changing caps across the EFC tuning diode. > > > > Bob > > > > > On Dec 8, 2017, at 8:05 AM, Ulf Kylenfall via time-nuts < > > time-nuts@febo.com> wrote: > > > > > > > > > Gentlemen, > > > We have an Oscilloquartz OCXO 8600-3that cannot any longer be adjusted > > into 5,000,000 Hz.It is about 1 Hz out of 5 MHz and turning > > coarse/fineadjustment potentiometers cannot bring the frequencyinto its > > specification. > > > Oven temperature is about + 80C accordingto the thermistor and the > > operating voltageis at 24 VDC. > > > Have Googled but the only thing that turns upis datasheets w/o any > > details. > > > Before I take it apart and start lookingfor obviously broken > components, > > isthere anyone that has a CLIP on this unit? > > > 73 > > > > > > Ulf Kylenfall - SM6GXV > > > _______________________________________________ > > > 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. > > > _______________________________________________ > 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. > -- Sent from my iPad 4. _______________________________________________ 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.
