Hi Gold will diffuse into quartz very slowly. That diffusion causes no apparent change in the performance of the quartz. A chrome barrier improves adhesion and blocks any gold transfer. That's the only thing I have ever heard in terms of "metal going into quartz".
Bob On Aug 29, 2013, at 9:02 PM, Tom Knox <[email protected]> wrote: > Hi Bob; > I have mentioned a couple things recently that I thought would be common > knowledge in the Time-Nuts community. The first was that 5MHz was a sweet > spot for quartz oscillators such that doubling 5MHz would generally out > perform a 10 MHz quartz oscillator. The other was the "migration" between > quartz and the plating/deposition metal over extended periods of time causing > a slight decrease in oscillator performance. These both seemed common > knowledge to people I work with that are far more knowledgeable then myself. > I am often on the steep part of the learning curve an don't always have time > for a full explanations. I will inquire about how factual I was, and if I > understood correctly I will pass on an explanation of the physics behind > these beliefs. Or bow my head in shame. > > Tom > > >> From: [email protected] >> Date: Thu, 29 Aug 2013 18:33:21 -0400 >> To: [email protected] >> Subject: Re: [time-nuts] B.V.A. 8600 for sale >> >> Hi >> >> On Aug 29, 2013, at 1:20 PM, Tom Knox <[email protected]> wrote: >> >>> I could be wrong but I thought when I priced these for work the BVA 8600 AT >>> cut was substantially cheaper then that. I think the $11,000 is more in >>> line with a BVA 8607 SC cut with an option. But from my point of view the >>> close in Phase Noise on this particular oscillator is what dictates it's >>> value. These BVA 8600's typically range from 110 to better then 120 dB @ >>> 1Hz which is a big difference. If this BVA is at the low phase noise end of >>> the range it could be a real bargain at $3000. >>> Another option in the $3000 range is the Wenzel Blue Top ULPN oscillators. >>> It may not match a good BVA inside 1Hz but will have at least a 20dB better >>> noise floor from about 10KHz out. The other plus with a BVA is the the >>> Quartz is capacitive coupled where most other oscillators have metal >>> deposited directly on the Quartz which will interact over time >> >> I know of no such interaction in modern quartz resonators - what are you >> referring to here? Your Wentzel part likely has either an aluminum electrode >> or a chrome / gold electrode system on it. Neither one "interacts" with >> quartz. >> >> Bob >> >>> and potentially diminish performance. As Tom and other explained prices go >>> up exponentially for ULPN oscillators. >>> Thomas Knox >>> >>> >>> >>>> Date: Thu, 29 Aug 2013 12:53:47 -0400 >>>> From: [email protected] >>>> To: [email protected] >>>> Subject: Re: [time-nuts] B.V.A. 8600 for sale >>>> >>>> OK but like a new car the value drops 50% off the lot. >>>> Anyway you slice it as nice as this might be I will stick with the $100 and >>>> less 10544/1081s 105s and sulzers. I may be a time-nut. But I am not >>>> time-Nutz. >>>> Perhaps for the lab that need it that is a darned good price. >>>> Regards >>>> Paul >>>> WB8TSL/1 >>>> >>>> >>>> On Thu, Aug 29, 2013 at 11:39 AM, Said Jackson <[email protected]> wrote: >>>> >>>>> Yup, I heard price goes up from there... >>>>> >>>>> Sent From iPhone >>>>> >>>>> On Aug 29, 2013, at 8:37, "Poul-Henning Kamp" <[email protected]> wrote: >>>>> >>>>>> In message <[email protected]>, Said Jackson >>>>> writes: >>>>>> >>>>>>> These are about $11,000 or so new if I am not mistaken. >>>>>> >>>>>> Depends what options it has... >>>>>> >>>>>> -- >>>>>> Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 >>>>>> [email protected] | TCP/IP since RFC 956 >>>>>> FreeBSD committer | BSD since 4.3-tahoe >>>>>> Never attribute to malice what can adequately be explained by >>>>> incompetence. >>>>> _______________________________________________ >>>>> 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. >> >> _______________________________________________ >> 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.
