Joe and Bruce,
> Ulrich has built a circuit that takes a sampling frequency
> input derived from a 10MHz GPSDO output and produces an
> S/PDIF output for this application. Its certainly worth
> trying since all the specs for the sound card aren't readily
> available.
I use a cheap and easy to
> Yes. Basically, every digital chip in this scheme requires a
> computer of some kind. What I've seen used is a small CPLD to do the
> initial parameter loads, and then to run the show.
If you prefer software to hardware, both Microchip (PIC) and Atmel (AVR) make
microprocessors that are ava
Group,
The question of 5000 year accuracy is moot, according to this quote from
an Irish newspaper, in response to asking Google for "Newgrange
rebuild."
"This was after the dismantling and replacing of the box under Prof
O'Kelly
between 1964 and 1967, during which slight changes turned it i
> A visit to this site, which I make every day I can, and to this
> particular page, will answer many questions and raise many more:
http://antwrp.gsfc.nasa.gov/apod/ap081220.html
Dick Moore
>
>
> --
>
> Message: 5
> Date: Mon, 22 Dec 2008 16:19:19 +1300
> From: "Ste
Mark Sims wrote:
> I got to play with a custom .50 BMG that shoots meaningful groups at 1500
> meters... the maker's definition of "meaningful group" is "smaller than your
> head". I managed to put two rounds through pretty much the same hole. Don't
> know where most of the other 18 rounds we
Alan Biocca wrote:
> The sun is illuminating the floor 4 minutes after sunset?
>
>
Oops! Thanks, I thought sunrise and typed sunset.
Actually the sun is visible after geometric sunset due to atmospheric
refraction.
corrected version:
According to the Wikipedia entry on Newgrange the duration
I got to play with a custom .50 BMG that shoots meaningful groups at 1500
meters... the maker's definition of "meaningful group" is "smaller than your
head". I managed to put two rounds through pretty much the same hole. Don't
know where most of the other 18 rounds went... Then there was hi
The sun is illuminating the floor 4 minutes after sunset?
-- Alan
On Sun, Dec 21, 2008 at 8:09 PM, Bruce Griffiths wrote:
> Bruce Griffiths wrote:
> > Steve
> > Steve Rooke wrote:
> >
> >
> >> Michael,
> >>
> >> 2008/12/22 Michael Sokolov :
> >>
> >>
> >>> Bill Hawkins wrote:
> >>>
> >>>
> >>>
> What if all three are different from each other?
Then you have a problem to debug.
> Or, if two agree, how do you know that the two are not both wrong?
> If you have 30 clocks and 20 say one time while 10 say another time,
> do you go with the majority?
> Is there not a small probability that
Bruce Griffiths wrote:
> Steve
> Steve Rooke wrote:
>
>
>> Michael,
>>
>> 2008/12/22 Michael Sokolov :
>>
>>
>>> Bill Hawkins wrote:
>>>
>>>
>>>
The passage grave at New Grange, Ireland, is one of those astronomical
wonders where the rising sun at winter solstice s
2008/12/22 Mike Naruta AA8K :
> What if all three are different from each other?
>
> Or, if two agree, how do you know that the
> two are not both wrong?
>
> If you have 30 clocks and 20 say one time while
> 10 say another time, do you go with the majority?
>
> Is there not a small probability that
Steve
Steve Rooke wrote:
> Michael,
>
> 2008/12/22 Michael Sokolov :
>
>> Bill Hawkins wrote:
>>
>>
>>> The passage grave at New Grange, Ireland, is one of those astronomical
>>> wonders where the rising sun at winter solstice shines down a relatively
>>> long tunnel to shine on carved st
What if all three are different from each other?
Or, if two agree, how do you know that the
two are not both wrong?
If you have 30 clocks and 20 say one time while
10 say another time, do you go with the majority?
Is there not a small probability that the 10 are correct?
:)
Lux, James P wrot
2008/12/22 Lux, James P :
>
>
>
> On 12/21/08 6:27 PM, "Steve Rooke" wrote:
>
>> 2008/12/22 Mike Monett :
>>>
>>> Right now, you don't have enough clocks. The only real solution to
>>> your problem, is to get another TBolt:)
>>
>> But which one of them is going to be right...
>>
>> 73, Steve -
Hi:
Isn't it the case that if the tilt of the Earth's spin axis is the same now as
it was 5,000 years ago that the Sun will shine through the tunnel at the
Solstice independent of any time or calender changes between then and now.
If, the tilt axis has changed then all bets are off.
Have Fun,
2008/12/22 Dave Ackrill :
> Richard Moore wrote:
>> The answer? The Feds then
>> required the speedometer to read not less than 2% nor more than 8%
>> high -- oddly enough, 5% is the mean of this variance. I don't know
>> what's required now. My '02 Toyota Highlander reads a tad less than
>> 1% hi
On 12/21/08 6:27 PM, "Steve Rooke" wrote:
> 2008/12/22 Mike Monett :
>>
>> Right now, you don't have enough clocks. The only real solution to
>> your problem, is to get another TBolt:)
>
> But which one of them is going to be right...
>
> 73, Steve - JAKDTNW (just another knuckle dragging
Michael,
2008/12/22 Michael Sokolov :
> Bill Hawkins wrote:
>
>> The passage grave at New Grange, Ireland, is one of those astronomical
>> wonders where the rising sun at winter solstice shines down a relatively
>> long tunnel to shine on carved stone at the far wall of a chamber.
>>
>> We know t
Michael Baker wrote:
> Just ducked out of my cave to let you know that
> you are a troublemaker. Get another T-bolt... Right.
> --Just what I need... another techno-addiction. As far as
> "sweet innocence" is concerned, I lost all I ever had
> when I jumped head-first into bench-rest rifle compet
I thought of something else. Time to lock can be really long. Say the OCXO
can swing +/- 1 ppm, +/- 10 Hz at 10 MHz. The +/- 1 ppm also applies to 0.5
Hz. To swing 180 degrees at 0.5 Hz, assuming the low pass filtered control
signal pushes the OCXO the full 1 ppm, will take 1e6 seconds unles
Hello, TimeNutters--
Mike Monett said:
It is refreshing to see such sweet innocence. For most of us, those
days are gone forever.
Your problem is you only have one clock. As soon as you get two, you
ask a very simple question: which one is right?
But that only makes things worse.
2008/12/22 Mike Monett :
>
> Right now, you don't have enough clocks. The only real solution to
> your problem, is to get another TBolt:)
But which one of them is going to be right...
73, Steve - JAKDTNW (just another knuckle dragging troglodyte time-nut wannabe)
--
Steve Rooke - ZL3TUV & G
> I don't know of an analog approach using the 1 pps divided to 0.5 Hz
> (for 50% duty cycle) as input to a phase detector. 1 Hz ripple
> frequency from the phase detector is probably not practical to
> filter. You would need a low pass filter time constant of at least
> 1000 seconds and I thi
Patrick,
I don't know of an analog approach using the 1 pps divided to 0.5 Hz (for
50% duty cycle) as input to a phase detector. 1 Hz ripple frequency from
the phase detector is probably not practical to filter. You would need a
low pass filter time constant of at least 1000 seconds and I thin
Patrick,
This has been covered extensively in recent past (this year). A quick look
through the archives will tell you more than you bargained for...
Didier
> -Original Message-
> From: time-nuts-boun...@febo.com
> [mailto:time-nuts-boun...@febo.com] On Behalf Of Patrick Reynaert
> Sen
On 12/21/08 1:11 PM, "Bill Hawkins" wrote:
> The passage grave at New Grange, Ireland, is one of those astronomical
> wonders where the rising sun at winter solstice shines down a relatively
> long tunnel to shine on carved stone at the far wall of a chamber.
>
> We know that solstice has the
Hi Bill
About 100 millenia of accumulated experience with probably the last 2 or
three actually farming very successfully where you need to know about
seasons. The Celts were a very civilised people (but their history was
written by their conquorers!) and great traders even in those days. Flints
Joe
Joe Gwinn wrote:
> Bruce,
>
> At 9:50 PM + 12/19/08, time-nuts-requ...@febo.com wrote:
>
>> Message: 7
>> Date: Sat, 20 Dec 2008 10:38:26 +1300
>> From: Bruce Griffiths
>> Subject: Re: [time-nuts] Sub Pico Second Phase logger
>> To: Discussion of precise time and frequency measurement
Richard Moore wrote:
> The answer? The Feds then
> required the speedometer to read not less than 2% nor more than 8%
> high -- oddly enough, 5% is the mean of this variance. I don't know
> what's required now. My '02 Toyota Highlander reads a tad less than
> 1% high, based on readings fro
Hello,
Using the 10kHz output to lock an OCXO is common practice and seems to give
good results.
Has anyone tried to use the 1pps output? One? could first make a simple divider
to create a 0.5Hz reference with 50% duty cycle, and then use this signal to
lock an OCXO. This would also allow th
Joe
Joe Gwinn wrote:
> Bruce,
>
> At 9:50 PM + 12/19/08, time-nuts-requ...@febo.com wrote:
>
>> Message: 8
>> Date: Sat, 20 Dec 2008 10:50:46 +1300
>> From: Bruce Griffiths
>> Subject: Re: [time-nuts] Sub Pico Second Phase logger
>> To: Discussion of precise time and frequency measurement
The astronomers of 5000 years ago were amateurs, so of course they
made their own gear and found out what worked.
Now if you find a notch in a rock on a distant mountain and the
shadow it casts every day at sunrise,
you only have to place a chalk mark on the wall each day to discover
that the p
Bill Hawkins wrote:
> The passage grave at New Grange, Ireland, is one of those astronomical
> wonders where the rising sun at winter solstice shines down a relatively
> long tunnel to shine on carved stone at the far wall of a chamber.
>
> We know that solstice has the shortest day and the longe
The passage grave at New Grange, Ireland, is one of those astronomical
wonders where the rising sun at winter solstice shines down a relatively
long tunnel to shine on carved stone at the far wall of a chamber.
We know that solstice has the shortest day and the longest night.
How'd they know that
Shortly after I bought my '97 VW Eurovan Camper in late '97, I
noticed that it was reading higher than I was going as timed by
stopwatch and mile markers. I kept measuring from time to time to
sort of average things out. I finally complained to the dealer that
it was about 5% high. After a
Bruce,
At 9:50 PM + 12/19/08, time-nuts-requ...@febo.com wrote:
>
>Message: 8
>Date: Sat, 20 Dec 2008 10:50:46 +1300
>From: Bruce Griffiths
>Subject: Re: [time-nuts] Sub Pico Second Phase logger
>To: Discussion of precise time and frequency measurement
>
>
>Joe
>
>Joe Gwinn wrote:
>>
Bruce,
At 9:50 PM + 12/19/08, time-nuts-requ...@febo.com wrote:
>
>Message: 7
>Date: Sat, 20 Dec 2008 10:38:26 +1300
>From: Bruce Griffiths
>Subject: Re: [time-nuts] Sub Pico Second Phase logger
>To: Discussion of precise time and frequency measurement
>
>
>Joe
>
>Joe Gwinn wrote:
>>
> Hello, Time-Nutters
[...]
> Hi, Bruce, Mike, et al
> Your points are all well taken! However, all I wanted to know (and
> all I asked the standards lab) was: How much "ballpark" error will
> I have when using my T-bolt as a reference to confirm the
> frequency of my 1
And faster speedometers make your warranty run out faster, which nobody
except the car companies like.
On Sun, Dec 21, 2008 at 10:21 AM, Magnus Danielson <
mag...@rubidium.dyndns.org> wrote:
> Thomas A. Frank skrev:
> > On Dec 20, 2008, at 6:03 PM, Burt I. Weiner wrote:
> >
> >> I suppose a good
FWIW - The Z3801 and 3816 are nearly identical.
Personally, I've been very pleased with my Z3801. It has been a real
workhorse, serving reliably for the last 5-6 years without a hitch. I use it as
an external reference for my service monitor (IFR/Aeroflex 1600A/S), and I've
yet
Thomas A. Frank skrev:
> On Dec 20, 2008, at 6:03 PM, Burt I. Weiner wrote:
>
>> I suppose a good comparison would be: How accurate does the
>> speedometer in the car really need to be and why.
>
> Accurate enough so that if its reading matches the posted sign, you
> don't receive a ticket?
An
I am looking to buy a high quality GPSDO for my lab, so that I can
run all of my test equipment off a single, high quality, low phase
noise oscillator. While time accuracy is important, phase noise is
the most important. I suspect my best phase noise instrument is my
HP8563E, with which I measu
I Marvin,
I have a 6152A and the Manual. Also, I have a spare 6152A in the attic that
is missing the Power Transformer. If I can be of help, let me know.
Bruce W1GBS
- Original Message -
From: "Marvin Moss"
To:
Sent: Sunday, December 21, 2008 10:57 AM
Subject: [time-nuts] Systron Donne
Is there a close counter to the 6152A that I might be able to use to fix my
6152A?
I have been unable to locate a manual for the 6152A and perhaps could use
another manual for another counter as being somewhat close to the 6152A.
My problem is either in the power supply or the gate circuit as it
Mike,
Thunderbolt is going to bring You from NY to SF at exactly 55MPH
AVERAGE, down to the fraction of the INPH, and still there is a
possibility that You earn a speeding ticket or two (or more) on the way.
Predrag Dukic (also not an expert, but things are not that simple
as Your quest
Hello, Time-Nutters--
Bruce said:
> A statement of accuracy is of little value unless you also give:
> 1) An estimate of the accuracy of standard used for comparison.
> 2) An estimate of the random and systematic errors in the comparison
> 3) Some details of the comparison method.
> 4) Avera
Hello all,
I have recently acquired a rackmount frequency standard made by FEI for
Marconi.
It consists of two FE-1000Q standards, wich consist of the following
modules:
FE-10A Oscillator
FE-20B Power Supply
FE-30 Battery Box
Since one of the inner ovens is not stable, I was wondering if someo
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