Hi These days there is really no reason at all to play with silver mica caps in an oscillator. A very normal ceramic NPO will do just as well. It also will be cheaper / easier to find. If you want to go exotic, go for glass or porcelain caps. It is pretty unlikely you will find them in a surplus OCXO. No real need to stock them up as spares …..
Bob > On Dec 8, 2017, at 11:38 AM, paul swed <[email protected]> wrote: > > I have also done this to older oscillators and it works. > When you look at the caps in the unit, if you are lucky somehow you may be > able to see what type they are. > Yes silver mica but there are various qualities and tempco's. > Try to match the quality if at all possible. > Otherwise guess. > Good luck and its not the worst issue you will run into. > Just maybe thats why you obtained the oscillator in the first place. > Hey bad stuff is my friend. > Regards > Paul > WB8TSL > > On Fri, Dec 8, 2017 at 11:31 AM, Jeremy Nichols <[email protected]> wrote: > >> 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 <[email protected]> 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 <[email protected]> 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 < >>>> [email protected]> 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 -- [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. >>>> >>> _______________________________________________ >>> 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. >>> >> -- >> Sent from my iPad 4. >> _______________________________________________ >> 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. _______________________________________________ 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.
