[time-nuts] IQRB-1 RBXO

Bob kb8tq kb8tq at n1k.org
Wed Aug 29 12:53:14 EDT 2018


Hi

That basic design (though maybe not this exact part) has been kicking around for at least the last ten 
years. Various people have popped up reselling it. There are a lot of older Rb’s that are in the <2x10^-11
range at 1 second:

http://www.ke5fx.com/rb.htm <http://www.ke5fx.com/rb.htm>

The gotcha with the part seems to have been that it’s “big and power hungry” for the people who are looking 
at the CSAC and it’s “expensive and not so stable” for the people who are playing with the LPRO-101 or FE-5680
style parts. 

Bob

> On Aug 29, 2018, at 12:35 PM, Nick Sayer via time-nuts <time-nuts at lists.febo.com> wrote:
> 
> Got an e-mail from DigiKey this morning talking about this:
> 
> https://www.iqdfrequencyproducts.com/products/pn/LFRBXO059244Bulk.pdf
> 
> Unlike the other rubidium modules I’ve dealt with (which is to say, all FEI), this one claims to have under 1E-10 stability at tau 1s (specifically, if I’m doing the math right, it looks like they’re claiming 8E-11). The phase noise looks to me to be… not fantastic (-67dBc/Hz @ 1 Hz) - again, unless I’m misreading the spec. They’re also $1874 each (Q:1). But they are 4 cubic inches(ish).
> 
> I’m not seriously thinking of anything that expensive, but I thought I’d throw it out there and see what other folks think (or perhaps it’s already been discussed and I’ve missed it. If so, sorry).
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