[time-nuts] Worst possible error on a rubidium

[Bob Camp]

Hi

I've looked at a random sample of a couple dozen Rb's that are in the 5 to
30 year old range. In about 90% of the cases I'm reasonably certain they
haven't been adjusted since they left the factory. If they still worked,
they all came in at or below +/- 3x10^-9. 

Bob 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Chris Albertson
Sent: Wednesday, July 13, 2011 10:21 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Worst possible error on a rubidium

On Wed, Jul 13, 2011 at 7:10 PM, Jose Camara <camaraq1 at quantacorp.com>
wrote:
>        This is a very interesting question, same as "if someone can't
> afford a GPSDO, Cesium or other time-nutty contraption, but buys a
> second-hand, uncalibrated Rubidium as his primary timebase, how accurate
> would it be"?

I think that is actually an interesting question.  Kind of like asking
the spec's on the cheapest wrist watch sold at Wallmart.  Is that $5
watch really usable?"   Had

For years I was even cheaper and used a square can TTL oscillator
salvaged from some dead computer part as my primary reference.  and
for most uses even the 100PPM can was over kill

Chris Albertson
Redondo Beach, California

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