On 15/08/11 05:36, Paul Cianciolo wrote:
Hello
I have a properly working Keithly 776 Frequency counter that has the TIC using
the A and B inputs.
I have z3801 that is considered my house reference, that 10 MHz output goes to
the A input.
A double oven RAKON oscillator is connected to the is c
On 15/08/11 17:07, Ulrich Bangert wrote:
Jim,
pardon to correct you but
It's if you measured the frequency (instantaneously) at one second
intervals, and calculated the standard deviation, that would
be the ADEV for tau=1 second.
is simply wrong in at least two aspects.
First: The measureme
On 15/08/11 12:25, David J Taylor wrote:
Ofcom update: NOTIFICATION OF GPS JAMMING EXERCISES
Folks, I have received the following:
STANFORD TRAINING AREA, EAST ANGLIA, SEPTEMBER AND OCTOBER 2011
Dates: Between 19 and 23 September 2011 and be
On 15/08/11 18:43, Tom Van Baak wrote:
Correct. Some ADEV plots conveniently include error bars so
the effect of sample count on confidence is in your face. The
TSC 5110 does this. See for example:
http://leapsecond.com/pages/gpsdo/log35824v.gif
http://leapsecond.com/pages/gpsdo/log35825v.gif
Th
Paul,
On 16/08/11 02:07, Paul A. Cianciolo wrote:
Magnus,
Now that I have a basic understanding, the way you explained seems just rite.
My lack of even a basic understanding is what led to the confusion.
Sorry if I caused you any trouble.
I am going to go back and read the article again.
Than
On 8/15/11 8:07 AM, Ulrich Bangert wrote:
Jim,
pardon to correct you but
no apologies needed..
It's if you measured the frequency (instantaneously) at one second
intervals, and calculated the standard deviation, that would be the
ADEV for tau=1 second.
is simply wrong in at least two aspe
Magnus,
Now that I have a basic understanding, the way you explained seems just rite.
My lack of even a basic understanding is what led to the confusion.
Sorry if I caused you any trouble.
I am going to go back and read the article again.
Thank you Magnus
Paul A. Cianciolo
W1VLF
http://www.res
Hi Tom,
Ok .. what you say makes good sense. If one is interested in the
performance over a specific period of time, than do a test with that
specific period of time in mind.
I notice in a later email you posted a chart showing the ADEV beginning .01
seconds. As expected it is worse at that sho
Correct. Some ADEV plots conveniently include error bars so
the effect of sample count on confidence is in your face. The
TSC 5110 does this. See for example:
http://leapsecond.com/pages/gpsdo/log35824v.gif
http://leapsecond.com/pages/gpsdo/log35825v.gif
There are also a number of modern variants
Thanks to those that responded. I didn't get any negative responses, so I
ordered one and will try it out.
Tnx es 73, Dick, W1KSZ
-Original Message-
>From: Bruce Griffiths
>Sent: Aug 13, 2011 12:31 PM
>To: Discussion of precise time and frequency measurement
>Subject: Re: [time-nuts]
Hi
The "how long can I go?" part of the question goes immediately to "how good
do I want?". For a good confidence level, you might want 100 samples at your
longest Tau rather than 5...
For long Tau, that can indeed get pretty nasty. 100 samples at 10,000
seconds is a very long time. It is worth ke
Hi
One more nit to pick...
ADEV looks at frequency differences. You would take the standard deviation
of the delta frequencies (F0-F1 etc) rather than the standard deviation of
the frequency (F0,F1...) readings.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nut
Is it correct to assume that if you collect data every 10 ms for
10 seconds (1000 data points in total), you could actually split
that data set into 100 sets of data at 1 seconds for 10 seconds
(10 data points in each set), which would have the same statistical
quality (I am sure caveats would app
Jim,
pardon to correct you but
> It's if you measured the frequency (instantaneously) at one second
> intervals, and calculated the standard deviation, that would
> be the ADEV for tau=1 second.
is simply wrong in at least two aspects.
First: The measurements need to be the AVERAGE frequency
Is it correct to assume that if you collect data every 10 ms for 10 seconds
(1000 data points in total), you could actually split that data set into 100
sets of data at 1 seconds for 10 seconds (10 data points in each set), which
would have the same statistical quality (I am sure caveats would a
On 8/14/11 8:10 PM, Paul Cianciolo wrote:
Folks,
I amtrying to understand some of the terms used here quite often.
I quoted this from Wikipedia
An Allan deviation of 1.3×10−9 at observation time 1 s (i.e. τ = 1 s) should be
interpreted as there being an instability in frequency between two obs
Ofcom update: NOTIFICATION OF GPS JAMMING EXERCISES
Folks, I have received the following:
STANFORD TRAINING AREA, EAST ANGLIA, SEPTEMBER AND OCTOBER 2011
Dates: Between 19 and 23 September 2011 and between 17 and 21 October 2011
inclusive.
On Thu, 11 Aug 2011 09:20:04 -0700
"Tom Van Baak" wrote:
> What is missed in many discussions about time scales is intent
> or implied accuracy. If I manually adjust my Pacific Daylight
> Time wrist-watch ahead by 7 hours does it then become a UTC
> watch? If I further adjust it by 0.3 seconds ca
Folks, I have received the following:
__
Notice of Interruption to MSF 60 kHz Time and Frequency Signal
The MSF 60 kHz time and frequency signal broadcast from Anthorn Radio
Station will be shut down over the period:
8 September 2011
from 10:00 BST
On 15/08/11 09:42, WB6BNQ wrote:
Hi Tom,
I was under the impression that the ADEV curves predict a confidence level
between measurement points based on the averaging of the noise over the time
between measurement points ?
For example, a quality oscillator would have more noise shown at times s
Hi Paul,
On 15/08/11 05:10, Paul Cianciolo wrote:
Folks,
I amtrying to understand some of the terms used here quite often.
I quoted this from Wikipedia
An Allan deviation of 1.3×10−9 at observation time 1 s (i.e. τ = 1 s) should be
interpreted as there being an instability in frequency betwee
Try the forums at , they folks there can be extremely
heplful.
Dave
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Murray Greenman
Sent: 15 August 2011 00:28
Subject: [time-nuts] OT - Plessey PR152
I realize this is very off topic, b
Tom Van Baak wrote:
> > Does this mean the observations made were at the very begining
> > and the very end of the 1 second time.
>
> Correct.
>
> > If so what value about all the values in between? What happens
> > if the oscillator deviated far worse than this during the interrim.
>
> Oscillator
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