Hi
> On Dec 1, 2014, at 7:23 PM, Richard (Rick) Karlquist
> 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” units. Next
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 be
HI
> On Dec 1, 2014, at 1:11 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
>> oscillat
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 measurement
> 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
instrum
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 bet
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 sum
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 th
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 wrote:
> Hi
>
> The simple answer:
>
> 1) There are setups that increase the reso
>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 wrote:
> Just because it's a maser does not mean it has good ADEV. Masers use the
> hydrogen physics package to discip
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 there.
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 outpu
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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