[time-nuts] Update -- Comparing 10 MHz Oscillators at 10 GHz

Bob Camp lists at rtty.us
Thu Jan 27 17:03:17 UTC 2011


Hi

As a first order approximation for phase noise:

Feed them both into a mixer and look at the output on a sound card after
some amplification.

Bob 

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Lester Veenstra
Sent: Thursday, January 27, 2011 2:05 AM
To: richard at karlquist.com; 'Discussion of precise time and frequency
measurement'
Subject: Re: [time-nuts] Update -- Comparing 10 MHz Oscillators at 10 GHz

For close in phase noise, the kind that is usually of interest, and hardest
to measure, it does work "in general", with the PLL loop bandwidth
limitation noted below for higher frequency noise.

Lester B Veenstra  MØYCM K1YCM
lester at veenstras.com
m0ycm at veenstras.com
k1ycm at veenstras.com
 

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-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Rick Karlquist
Sent: Thursday, January 27, 2011 3:38 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Update -- Comparing 10 MHz Oscillators at 10 GHz

Brucekareen at aol.com wrote:
...........The bricks are extremely low noise
in their own right and are locked with a narrow loop that prevents
source noise from degrading them.

Rick Karlquist N6RK


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