Gentlemen, gentlemen and gentlemen!
We are time-nuts. Accuracy is paramount. We are scientists.
Please steer clear of pounds, feet, cubic yards and other such rubbish.
Scientists speak in metric and so should you.
Please.
Jim
On 13 December 2011 16:24, Don Latham d...@montana.com wrote:
Injection locking: perhaps the first to document this effect was indeed
Christiaan Huygens.*
*
On Tue, Dec 13, 2011 at 10:28 AM, Jim Palfreyman jim77...@gmail.com wrote:
Gentlemen, gentlemen and gentlemen!
We are time-nuts. Accuracy is paramount. We are scientists.
Please steer clear of
On Mon, Dec 12, 2011 at 05:42:31PM -0800, Chris Albertson wrote:
I was searching Google for information on these. Seems if you are
not on this list info is hard to come by.
I have bought one of these a couple of months ago. It's working, but
I have not the opportunity to verify accuracy
Paul's simple filter:
http://www.w1ghz.org/small_proj/small_proj.htm
Mike
- Original Message -
From: Bob Bownes bow...@gmail.com
To: li...@lazygranch.com; Discussion of precise time and frequency
measurement time-nuts@febo.com
Sent: Monday, December 12, 2011 10:11 PM
Subject: Re:
Have we no female time-nuts? Interesting.
On 12/13/2011 04:28 AM, Jim Palfreyman wrote:
Gentlemen, gentlemen and gentlemen!
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Just bought two for US99.98 (UK ~£66) with free shipping. Good deal. Will be
interesting to see how they perform. Also interesting to know what FEI are
currently quoting for new units. Last time I got a quote from them (5
years+) I was quoted over UK£1K each in single qty.
Rob Kimberley
Yawn!
Jim Palfreyman wrote:
Gentlemen, gentlemen and gentlemen!
We are time-nuts. Accuracy is paramount. We are scientists.
Please steer clear of pounds, feet, cubic yards and other such rubbish.
Scientists speak in metric and so should you.
Please.
Jim
I just ordered the parts for this filter from Mouser Electronics. ~ $30
plus shipping including a shiny new Pomona box.
qty 2 542-78F1R0-RC RF Inductors 1.0uH 10% @ $0.18 ea
qty 2 140-50S5-271J-RC Ceramic Disc Capacitors 50V 270pF SL 5% Tol @ $0.14
ea
qty 1 140-50S5-471J-RC Ceramic Disc
...and just what is 'less accurate' about pounds, feet, cubic yards etc?
The metric system (I use the term loosely) is ideal for those people who
cannot do mental arithmetic and can only shift decimal points. All
'imperial' measurements can be defined just as the metre, kilogramme (and
there is a
Not to take anything away from Paul's design, but if you have to buy the
box new, for three bucks more you can get a complete 10.7 MHz LPF with
BNC connectors from MiniCircuits (Model BLP-10.7+, $32.95). They also
have quite a few other useful cutoff frequencies -- 1.9 MHz, 5 MHz, 30
MHz,
On 12/13/11 6:37 AM, Reeves Paul wrote:
...and just what is 'less accurate' about pounds, feet, cubic yards etc?
The metric system (I use the term loosely) is ideal for those people who
cannot do mental arithmetic and can only shift decimal points. All
'imperial' measurements can be defined just
If your intent is to take full advantage of the long term as well as short term
stability of a reference oscillator, the best approach is a low pass filter
that will have small (and stable) phase shift at 10 MHz.
Most bandpass filters will have enough temperature sensitivity of the phase
shift
I thought we were all bi-lingual on this site
:-)
Rob Kimberley
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Jim Palfreyman
Sent: 13 December 2011 09:28
To: Discussion of precise time and frequency measurement
Subject: Re:
But it wouldn't be a nice 10,000 km from pole to equator...
And surprise! It still isn't! It is more like 12,713.5 km.
... unless you measure it to one significant figure.
Metric vs English is purely about a set of arbitrary constants.
Decimal pounds, decimal inches and decimal seconds
Ah yes, God's units as revealed by the French. :-)my mistake
Don
Jim Palfreyman
Gentlemen, gentlemen and gentlemen!
We are time-nuts. Accuracy is paramount. We are scientists.
Please steer clear of pounds, feet, cubic yards and other such rubbish.
Scientists speak in metric and so should
What's metric or Common Measure about seconds? ;)
Bob
On Tue, Dec 13, 2011 at 11:47 AM, Don Latham d...@montana.com wrote:
Ah yes, God's units as revealed by the French. :-)my mistake
Don
Jim Palfreyman
Gentlemen, gentlemen and gentlemen!
We are time-nuts. Accuracy is paramount. We are
see also:
www.timeok.it/files/10_mhz_bandpass_filter.pdf
Luciano
Luciano P. S. Paramithiotti
IZ5JHJ
- Original Message
From: n1...@burlingtontelecom.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] filtering a
I'm a scientist?
:-)
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Bob Bownes
Sent: 13 December 2011 16:57
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] gravity controlled pendulumn clock?
What's
I reported a filter design I was working on back in November, using
10 base T LAN filter modules. The first experimental air-wired unit
with two modules got to about -75 dBc at 30 MHz, rising to -65 dBc at 70 MHz.
After building the same circuit with shielded compartments, it ran
about -85
Here is a plot from the latest GPIB hack which reads frequency and phase
about once per second. Only the phase is shown here. Small tweeks to the
fine freq standard adjustment take several minutes to take effect. Is
the fine adjustment tweeking some parameter related to the oven??? On
Hi
I'd second that recommendation.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of lstosk...@cox.net
Sent: Monday, December 12, 2011 10:18 PM
To: time-nuts@febo.com
Cc: time-nuts-requ...@febo.com
Subject: Re: [time-nuts] Pear
On 12/13/11 8:19 AM, Chuck Harris wrote:
But it wouldn't be a nice 10,000 km from pole to equator...
And surprise! It still isn't! It is more like 12,713.5 km.
Huh?
For WGS84 ellipsoid
Equatorial radius 6378km * 2 * pi = 40080.4 km
Polar Radius 6357km
(Clarke 1866 is 6377.5, 6356.6)
At
Hi
Regardless of the design, what ever filter you use will be sensitive to
load. Hooking up a few dozen instruments to a standard line with BNC T's is
unlikely to present 50 ohms to the filter. The more complex the filter,
generally the more sensitive it will be
Bob
-Original
On 12/13/11 8:57 AM, Bob Bownes wrote:
What's metric or Common Measure about seconds? ;)
Bob
AN excellent point.. aren't seconds the only unit that is the same in
basically all measurement systems? there's cgs, mks, SI, Imperial, US
Customary, Avoirdupois, etc and they all use seconds.
Yes, you don't want to send un-buffered (or unprotected) signals -
especially right out of a filter - out for distribution. I have found
that some pieces of equipment will only take the external reference
over a certain small level range, so the distribution amplifier needs
to have an
Yes, but different seconds. I learned many years ago to use the RSF
(rod-stone-fortnight) system of units. Small errors are much smaller...
Don
Jim Lux
On 12/13/11 8:57 AM, Bob Bownes wrote:
What's metric or Common Measure about seconds? ;)
Bob
AN excellent point.. aren't seconds the only
I saw: pole to equator and read: pole to pole, or diameter.
A simple literacy problem...
-Chuck Harris
Jim Lux wrote:
On 12/13/11 8:19 AM, Chuck Harris wrote:
But it wouldn't be a nice 10,000 km from pole to equator...
And surprise! It still isn't! It is more like 12,713.5 km.
Huh?
For
Number one rule in life - never lose your sense of humour!
Rob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Don Latham
Sent: 13 December 2011 18:38
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts]
On Tue, Dec 13, 2011 at 08:19, Chuck Harris cfhar...@erols.com wrote:
Metric vs English is purely about a set of arbitrary constants.
Decimal pounds, decimal inches and decimal seconds is just as
arbitrary, and just as easy to use as the metric system.
I would agree, as long as you stay
Having spent more of my adult life in the US than in France, and having been
thoroughly exposed to both systems, I can testify (in my own name) that it is
easier and faster to get a good approximation when doing mental arithmetic on
engineering problems using the metric system than the imperial
Really it is more like potato shaped :)
El 13/12/2011 18:12, Bob Camp escribió:
Hi
I'd second that recommendation.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of lstosk...@cox.net
Sent: Monday, December 12, 2011 10:18 PM
To:
If you are going to buffer the output, why does the filter have to be
passive? Did I miss something here? Today 10MHz is in the realm of
active filters. [Hey, not that I made an active filter at 10MHz.]
Sensitivity is a function of the denominator. The only advantage to a
LPF over a BPF is
If your concern is harmonics, the best combination is a low pass filter that
cuts high enough to have no (or negligible) group delay at 10 MHz, and one or
more notch filters for the harmonics, as many as necessary to get the
attenuation you desire.
These filters should have no measurable
I find the biggest problem in units is when you want to solve a
physics problem and need
data on typical physical properties of substances, for instance
design of thermal insulation for an OCXO.
You can look through dozens of books with tables of typical values,
most of which are in units
of
I guess they figured out they had some value.
Such is life.
Regards
Paul
WB8TSL/1
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Chuck wrote:
Small tweeks to the fine freq ... adjustment take several minutes to
take effect. Is the fine adjustment tweeking some parameter related
to the oven???
I doubt it, but I do not have actual knowledge of the inner
workings. I have found that the heat loss (I assume) through the
Make an offer and see what happens.
On 12/13/11, paul swedpaulsw...@gmail.com wrote:
I guess they figured out they had some value.
Such is life.
Regards
Paul
WB8TSL/1
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On 12/13/2011 2:44 PM, Charles P. Steinmetz wrote:
I think it's been asked, and recently, but I haven't seen a positive
response. Does anybody have schematics for the Racal OCXOs they can
make available?
Charles, I have a hand drawn circuit diagram of the 9442 rapid warm up
oven which I
On 12/13/11 12:26 PM, shali...@gmail.com wrote:
Having spent more of my adult life in the US than in France, and having been
thoroughly exposed to both systems, I can testify (in my own name) that it is
easier and faster to get a good approximation when doing mental arithmetic on
engineering
Didier's site has a manual for the 1995-1996 which shows the OCXO's doubler
circuit, if that helps. I think it's the same as in the 1992.
http://www.ko4bb.com/Manuals/Racal/RACAL19951996OperationandService.pdf
Aart Olsen
- Original Message -
I think it's been asked, and recently,
Earlier this year I got a very good deal on an as new Tektronix FCA3100
Timer/Counter/Analyzer, which turned out to be a rebadged Pendulum CNT91.
Pendulum offers what looks to be some very nice software for this unit,
what it calls its TimeView Modulation Domain Analyzer, but Tektronix have
I don't understand at all the arguments against the metric system and
the polemic remarks about. I second the statements of Neville and Jim.
Without these intelligent french Astronomers like Jean-Baptiste-Joseph
Delambre, Pierre-François-André Méchain and J.J. Lalande (more infos:
Ken Alder, The
Anyone who is interested in buying these units should take a look at the
completed listings and be guided accordingly when making an offer. I
recently picked up a couple for ~ $35 each, including shipping. True
the price may be going up, but it looks like you can still get them for
under $40
The beautiful irony in all of this, is that the negative statements about
metric and the desire not to change to the metric system comes from the US,
yet it was Benjamin Franklin and Thomas Jefferson who took the original
idea to France when they were ambassadors. The French ran with it and the
US
Arnold Tibus wrote:
I don't understand at all the arguments against the metric system and
the polemic remarks about. I second the statements of Neville and Jim.
Without these intelligent french Astronomers like Jean-Baptiste-Joseph
Delambre, Pierre-François-André Méchain and J.J. Lalande (more
The good Lady Heather can display temperature values in all sorts of archaic
measurement systems. And buried in there somewhere (I think its still there)
can display phase errors in femtofortnights.
I once worked for a company famous for its insistence on endless specs and
paperwork that
Come to think of it, you will have more noise if you use a LPF rather
than a BPF, given noise being proportional to the square root of
bandwidth.
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cfhar...@erols.com said:
Standardization is fine. Attempting to force the world's largest economy to
bend to the wishes of Europe isn't fine. The US system has been
standardized for more than a century, and works very nicely. Decimal
inches, decimal pounds, and seconds is every bit as
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