[time-nuts] B.V.A. 8600 for sale

Bob Camp lists at rtty.us
Thu Aug 29 21:34:44 EDT 2013


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 <actast at hotmail.com> 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: lists at rtty.us
>> Date: Thu, 29 Aug 2013 18:33:21 -0400
>> To: time-nuts at febo.com
>> Subject: Re: [time-nuts] B.V.A. 8600 for sale
>> 
>> Hi
>> 
>> On Aug 29, 2013, at 1:20 PM, Tom Knox <actast at hotmail.com> 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: paulswedb at gmail.com
>>>> To: time-nuts at febo.com
>>>> 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 <saidjack at aol.com> wrote:
>>>> 
>>>>> Yup, I heard price goes up from there...
>>>>> 
>>>>> Sent From iPhone
>>>>> 
>>>>> On Aug 29, 2013, at 8:37, "Poul-Henning Kamp" <phk at phk.freebsd.dk> wrote:
>>>>> 
>>>>>> In message <572A741B-0213-4F1C-BA59-C2D396A031EC at aol.com>, 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
>>>>>> phk at FreeBSD.ORG         | TCP/IP since RFC 956
>>>>>> FreeBSD committer       | BSD since 4.3-tahoe
>>>>>> Never attribute to malice what can adequately be explained by
>>>>> incompetence.
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