If you want a _Time_ reference, somewhat you need a way to
compare/synchronize your time reference with others, event if it's the best
cesium or maser available. If you "only" need a _Frequency_ reference, a
rubidium will probably get you happy, even without exterior comparison...
Best regards,
Jean-Louis
----- Original Message -----
From: "Charl" <[email protected]>
To: "Discussion of precise time and frequency measurement"
<[email protected]>
Sent: Friday, December 11, 2009 12:00 PM
Subject: Re: [time-nuts] Beginner's time reference
Dear Hal and others,
Thank you for your suggestions. I suppose I should have emphasised that I
was looking to have my own reference, i.e. something not dependent on GPS,
LORAN, or other signals from the aether. Indeed I might get better
accuracy
for less money by tapping the GPS time signal, but to me that's not as
much
fun as building my own atomic reference.
Hal, is there much difference in quality for these rubidium tubes? Will I
get what I pay for? In any case, you make a good point about measuring the
accuracy. I'm a university student, so perhaps I can pay the physics
department a visit. Otherwise, maybe I could compare it to the GPS signal?
Kind regards,
Charl
On Fri, Dec 11, 2009 at 9:30 AM, Hal Murray <[email protected]>
wrote:
> I'm hoping to build my own circuit around the device, which might cut
> down the costs somewhat. Some rubidium sources on eBay go for less
> than $100, but I'm not sure what quality to expect. Any advice or
> suggestions are appreciated!
Short answer: Sure, get one of the $100 rubidium boxes and see what you
can
do with it.
Long answer: You just stuck you toe into a huge tar pit. Pick a corner
that
seems like fun and dive in.
How are you planning to measure if whatever you build is any good?
--
These are my opinions, not necessarily my employer's. I hate spam.
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