Just because it's a maser does not mean it has good ADEV. Masers use the
hydrogen physics package to discipline an external oscillator just like a GPSDO
uses GPS. So a maser can be considered to be a HDXO... hydrogen disciplined
crystal oscillator. Your maser ADEV is only as good as its
Hi
The simple answer:
1) There are setups that increase the resolution of a counter
2) There are devices that are far more accurate at measuring frequency than a
SR620
3) If you have three reasonably identical samples of a device you can indeed
inter compare them once the resolution is
Your maser ADEV is only as good as its output oscillator/pll.
Upto the disciplining algorithm time constant, then it will be better.
On Mon, Dec 1, 2014 at 9:07 AM, Mark Sims hol...@hotmail.com wrote:
Just because it's a maser does not mean it has good ADEV. Masers use the
hydrogen physics
and then, for the second part of the question, the 10^-12 is an Allan
deviation but usually the terms variance and deviation are
unfortunately used one in place of the other.
On Mon, Dec 1, 2014 at 1:41 PM, Bob Camp kb...@n1k.org wrote:
Hi
The simple answer:
1) There are setups that increase
On 11/30/2014 11:09 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
I think I have a flaw in my understanding of this.
How can something like an SR620 measure the ADEV of an oscillator, if the
oscillator is of a similar or better than the reference fed into the SR620?
What HP did with
Back in the day, you built two devices measured the noise and then
assumed that they where so near each other that you just split the noise
in two and assigned the same noise to them both.
Doing the three-cornered hat allows you to make thee observations from
three sources, so breaking the
Rick,
On 12/01/2014 07:11 PM, Richard (Rick) Karlquist wrote:
On 11/30/2014 11:09 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
I think I have a flaw in my understanding of this.
How can something like an SR620 measure the ADEV of an oscillator, if
the
oscillator is of a similar or
I think I have a flaw in my understanding of this.
How can something like an SR620 measure the ADEV of an oscillator, if the
oscillator is of a similar or better than the reference fed into the SR620?
The key is to realize that all measurements are actually just comparisons: the
instrument
Tom,
On 12/01/2014 11:05 PM, Tom Van Baak wrote:
I think I have a flaw in my understanding of this.
How can something like an SR620 measure the ADEV of an oscillator, if the
oscillator is of a similar or better than the reference fed into the SR620?
The key is to realize that all
HI
On Dec 1, 2014, at 1:11 PM, Richard (Rick) Karlquist rich...@karlquist.com
wrote:
On 11/30/2014 11:09 PM, Dr. David Kirkby (Kirkby Microwave Ltd) wrote:
I think I have a flaw in my understanding of this.
How can something like an SR620 measure the ADEV of an oscillator, if the
On 12/1/2014 4:08 PM, Bob Camp wrote:
Others did a similar thing by simply taking production OCXO’s to the limit of
their EFC range. That let you do a coarse sort to find some number of “likely”
units. Next step was to pop a few of them open and short this or that out to
get a reasonable
Hi
On Dec 1, 2014, at 7:23 PM, Richard (Rick) Karlquist rich...@karlquist.com
wrote:
On 12/1/2014 4:08 PM, Bob Camp wrote:
Others did a similar thing by simply taking production OCXO’s to the limit
of their EFC range. That let you do a coarse sort to find some number of
“likely”
I think I have a flaw in my understanding of this.
How can something like an SR620 measure the ADEV of an oscillator, if the
oscillator is of a similar or better than the reference fed into the SR620?
I see plots of ADEV for hydrogen masers, but I can't understand how this
can be measured from
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