Hi All; Is the "Aging" generally related to the quartz, or other components?
Happy-Merry; Thomas Knox ________________________________ From: time-nuts <time-nuts-boun...@febo.com> on behalf of Bob kb8tq <kb...@n1k.org> Sent: Friday, December 8, 2017 9:58 AM To: Discussion of precise time and frequency measurement Subject: Re: [time-nuts] End-of-Range: Oscilloquartz OCXO 8600-3 Hi One risk is that the oscillator may have drifted further than one can easily adjust it by just changing a select cap. That seems silly when we are talking about < 1 ppm, but the 8600 is an unusual OCXO. The electrodes BVA is not your run of the mill crystal. The “air gap” (actually a gap in vacuum) puts a pretty small capacitance in series with the normal crystal equivalent circuit. That cuts the practical tuning range down quite a bit…. Bob > On Dec 8, 2017, at 11:44 AM, Magnus Danielson <mag...@rubidium.dyndns.org> > wrote: > > Hi, > > Many include a EFC offset pot, but when you go out of range on that, as I > have for one of mine, here is no real option execept pop the lid and > potentially find a cap or change a cap. I have not seen any as I recall, but > should maybe take a look. > > However, the value for me is not to have it as sharp 5 MHz source, but very > low phase noise and high stability source as reference for measurement. The > offset error is less of a concern then, so that is why I have not spent > quality time to fix it. > > Cheers, > Magnus > > On 12/08/2017 04:52 PM, paul swed 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 time-nuts Info Page - American Febo Enterprises<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> www.febo.com time-nuts is a low volume, high SNR list for the discussion of precise time and frequency measurement and related topics. To see the collection of prior postings to ... >> 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 time-nuts Info Page - American Febo Enterprises<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> www.febo.com time-nuts is a low volume, high SNR list for the discussion of precise time and frequency measurement and related topics. To see the collection of prior postings to ... > 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 time-nuts Info Page - American Febo Enterprises<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> www.febo.com time-nuts is a low volume, high SNR list for the discussion of precise time and frequency measurement and related topics. To see the collection of prior postings to ... 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.
