[time-nuts] nubie querie

[Bill Hawkins]

1/ There are no sources of constant frequency. Approximations to that
goal may be measured by their cost.

2/ There is no single mechanism, unless it's quantum mechanics.

Bill Hawkins

This message has been fact checked by a 9 year old with a Twitter account.


-----Original Message-----
From: Bob Camp
Sent: Thursday, March 04, 2010 11:05 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] nubie querie

Hi

The best answer to the second one is "That depends." There are *lots* of
different oscillators out there. Earth - sun, Helium atom floating in space
...

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Don Collie jnr
Sent: Thursday, March 04, 2010 8:14 AM
To: time-nuts at febo.com
Subject: [time-nuts] nubie querie

I`m not sure that questions like these is welcome on this list, but here
goes anyway : 

1/ What are the the 10 sources of the most constant [invariant] frequencies
known to man, in order of decreacing constancy? Four immediately come to
mind.

2/ What is the mechanism in an oscillator, that is responsible for phase
noise? [In only one sentence please]
If this is known, then it becomes easier to design low phase noise
oscillators.

I hope you enjoy these questions,.................................Don.
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