[time-nuts] Looking for datasheet for Oscilloquartz 8602

Magnus Danielson magnus at rubidium.dyndns.org
Tue May 28 03:27:55 EDT 2013

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.


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