[time-nuts] Looking for datasheet for Oscilloquartz 8602

Tom Knox actast at hotmail.com
Tue May 28 11:54:55 EDT 2013

I think that used BVA pricing is difficult since prices of really good quartz is to me exponential. What the BVA offers is exceptional close in phase noise. And because of their reputation any BVA listed on eBay will get some serious bids. I would find it interesting to see what a couple nice 8607 would sell for on eBay. I know I would pay dearly, and I doubt I would be up with the highest bidders. But today companies like Wenzel offers exceptional performance at much more reasonable prices.  So based on Phase Noise alone an older 8600 could  be much less. The other big thing is find a BVA for sale. They rarely become available used and I would say it is a seller market.  That said none of us time nuts have jumped on the chance to buy the one currently on eBay at $4500, so everyone seems to agree that is to expensive. But if you are lucky enough to own a BVA what would you sell yours for? I imagine that in view of what you would sell for the guys $4500 price looks a bit more reasonable.  I guess my question is what would you pay and what have you paid for a 5MHz oscillator with -120dB @1Hz? what about  -130dB @1Hz? what about -135dB at 1Hz?

Tom Knox
> Date: Tue, 28 May 2013 09:27:55 +0200
> From: magnus at rubidium.dyndns.org
> To: time-nuts at febo.com
> Subject: Re: [time-nuts] Looking for datasheet for Oscilloquartz 8602
> On 05/28/2013 06:57 AM, Attila Kinali wrote:
> > Moin,
> >
> > On Sun, 26 May 2013 18:15:22 +0200
> > Magnus Danielson<magnus at rubidium.dyndns.org>  wrote:
> >
> >> The OSA 8602 is a variant of the OSA 8600 and 8601. These variants is
> >> mainly on the connection on the "front".
> >>
> >> I don't have a 8602 datasheet as such, but I have some 8602 related
> >> specs as found in the extended OSA 3000 manual.
> >>
> >> It is essentially the same AT-cut oscillator that you can expect from
> >> the 8600 base.
> >
> > Hmm.. IIRC AT cut oscillators have the "problem" of frequency jumps
> > on slight temperature changes. Using an AT cut oscillator thus kind
> > of defeats the effort of doing a BVA.
> Frequency jumps isn't a particular feature of AT cut, but rather to 
> cleanness of the crystal and mechanical stresses. The BVA strategy aims 
> to reduce systematic shift, it is then baked out to remove residues that 
> is known to cause issues. There is a good article on it amongst the PTTI 
> papers. Also, it's an oven within a dewar flask, so temperature 
> conditions is pretty stable. The AT-cut BVA is far from the same thing 
> that a typical TTL-can AT-cut is. There seems to be an overbeleif in the 
> cut and not look at all the other things that needs to come together to 
> make a great oscillator.
> >> What information are you really seeking?
> >
> > What such an oscillator would be worth :-)
> > You might be aware that there is one 8602 on sale on ebay for 4500USD.
> > I asked Oscilloquartz about that and from what i gathered, it's definitly
> > not worth that money. For slightly more you can get a new 8607 already.
> > The 8602 worth is probably around 150 to 200USD.
> That is overpriced. An OSA 8602 should have about the same price as OSA 
> 8600, whatever the going price of that is.
> Cheers.
> Magnus
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