never thought of before.
Cheers,
Neville Michie
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of a degree
as the AC cycles.
If anything, the service life (10 years or more) of the AC unit is longer than
conventional hysteresis sensor
dominated chuggers.
All of this occurs because you stirred the air in the room!
cheers,
Neville Michie
> On 2 Nov 2017, at 6:32 AM, Poul-Henning Kamp
would try using a reactive metal getter in the package to pick up any mobile
water molecules.
cheers,
Neville Michie
> On 10 Jun 2017, at 9:52 AM, Bob kb8tq <kb...@n1k.org> wrote:
>
> Hi
>
> You can’t quite process a crystal at 300C, but you can get close.
>
> Bob
My memory of high vacuum work is that you need to pump for 4 hours
at 300C to remove the water monolayer from glass.
On top of the that water monolayer is another water monolayer that comes off
more easily,
and on top of that another………..
cheers,
Neville Michie
> On 9 Jun 2017, at 10:57
to make these observations again
for
a long time. A good OCXO will keep time for half an hour, will the apparent GPS
time
show a deviation?
cheers,
Neville Michie
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oscillators running together,
and we could establish almost any frequency with precision.
Calibting an oscillator would not have been difficult.
Cheers, Neville Michie
> On 12 Feb 2017, at 5:08 PM, Scott Stobbe <scott.j.sto...@gmail.com> wrote:
>
> I was inspired recently coming a
to convenience.
cheers,
Neville Michie
> On 28 Oct 2016, at 11:05 AM, Poul-Henning Kamp <p...@phk.freebsd.dk> wrote:
>
>
> In message <20161027134312.ga18...@panix.com>, Ron Bean writes:
>
>> And since this is time-nuts: Measuring humidity accurately i
You are correct to question commercial humidity sensors.
It seems to have come about because no-one can make a dollar by selling
humidity.
Manufacturers do not tell the truth, they think ours is as good as theirs so we
should claim the same accuracy. People buy these sensors, believe them, and
temperature fluctuation if you are going to
control relative humidity.
cheers,
Neville Michie
> On 27 Oct 2016, at 8:17 PM, David J Taylor <david-tay...@blueyonder.co.uk>
> wrote:
>
> From: jimlux
>
> You can buy the smallest "window" airconditioner and &q
they were started under the right conditions.
I did publish this 30 or 40 years ago in an Australian electronics magazine.
cheers,
Neville Michie
> On 27 Oct 2016, at 2:59 AM, John Ackermann N8UR <j...@febo.com> wrote:
>
> I may have the opportunity to build a small "clock room
but ensures low temperature gradients.
The trick is to have fast response in heater and measurement and no hysteresis
in the controller.
cheers,
Neville Michie
> On 6 Sep 2016, at 12:48 PM, Richard (Rick) Karlquist <rich...@karlquist.com>
> wrote:
>
> As we all know,
depending whether is swings clockwise or anticlockwise due to the earths
rotation.
What do you think?
Cheers,
Neville Michie
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Hi,
a new laptop and a new problem,
I can not find COM1, and the slash command
on Lady Heather provokes a response that spaces and slash
marks are illegal in file names.
Any ideas?
thanks,
Neville Michie
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of the physical
system by the
use of the thermometer.
cheers,
Neville Michie
> On 12 Mar 2016, at 8:21 pm, ken hartman <k...@hartmans.org> wrote:
>
> Interestingly, the use of AC-cut crystals (high linear tempco of frequency)
> is found in the development of OCXOs. Using
and how much harm escaping from
thermostasis for an hour or two does to your task.
Cheers,
Neville Michie
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object you would want Earth’s rotation to be phase or
sidereal Time locked. I realise that for such a task far more complex
computation would be required.
So is a time locked loop a valid concept?
Cheers,
Neville Michie
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Consider the problems of small detached crumbs of this material
upsetting the interelectrode capacitances of the oscillator.
Fibre material may be more stable.
Just a thought,
Neville Michie
On 26/02/2015, at 6:05 AM, Dave M wrote:
Great find, Arthur. I had already convinced myself to use
THe stability /accuracy of lasers is entirely dependent on the cavity length.
Materials used are usually invar or silica, so you are no better off than
with a quartz crystals.
They are just a resonant cavity.
cheers,
Neville Michie
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for double glazing, katharometers and generally all devices.
The suppression of turbulent heat transfer may provide more insulation but also
less noise and instability.
So it may be a good idea to use a relatively close fitting box with thick walls.
Cheers,
Neville Michie
On 23/11/2014, at 11:37 PM
Hi,
I am interested in your new GPSDO.
How do I find out more about buying the kit?
Is this a USA only deal?
cheers,
Neville Michie
Sydney,
Australia
On 18/10/2014, at 9:35 AM, S. Jackson via time-nuts wrote:
LTE Lite GPSDO
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months guarantee.
cheers,
Neville Michie
On 28/07/2014, at 1:59 PM, Chuck Harris wrote:
A small disagreement on a couple of points
Lead sulfate does not dissolve (in the normal battery chemistry),
and does not go all over the place. It forms at the lead and the
lead oxide plates, during
they are also very efficient (99.9% +) electrically.
cheers,
Neville Michie
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site.
cheers, Neville Michie
On 23/07/2014, at 5:11 AM, Attila Kinali wrote:
On Tue, 22 Jul 2014 01:17:03 +0100
Brian D gro...@planet3.freeuk.co.uk wrote:
Saturated steam at standard pressure will be exactly 212F, or 100C.
Stupid question: How to you ensure that the steam is saturated
water.
Admittedly a deep cellar made a good clock vault, but a thermistor, a computer
fan and
a 100 watt filament lamp in a wooden box can give far more accurate temperature
control.
cheers,
Neville Michie
On 23/07/2014, at 10:17 PM, Alexander Pummer wrote:
it does need a different design
drilled
into aluminium plate
edge wise to measure the plate temperature. You only have to do a few
experiments to find
that this is necessary.
cheers,
Neville Michie
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Hi,
it used to be called NSL, National Standards Laboratory, part of the CSIRO.
Now it appears to be called National Measurement Institute, (NSI)
and seems to be located mainly at Lindfield NSW.
http://www.measurement.gov.au/Pages/default.aspx
See if that works,
Cheers,
Neville Michie
On 29/06
for protection.
cheers,
Neville Michie
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Use a local solar cell and battery power supply.
If it is self contained it should not attract lightning.
Cheers,
Neville Michie
On 29/06/2014, at 1:13 PM, Hal Murray wrote:
namic...@gmail.com said:
Fibre optic would seem to be the answer for protection.
Assuming I use fibers
as magnitude.
cheers,
Neville Michie
On 27/06/2014, at 1:59 AM, Max Robinson wrote:
How fast does the maltese cross turn?
Regards.
Max. K 4 O DS.
Email: m...@maxsmusicplace.com
Transistor site http://www.funwithtransistors.net
Vacuum tube site: http://www.funwithtubes.net
field on the mill.
cheers,
Neville Michie
I know you are talking about measuring lightning strikes but if you get the
impedance high enough, you can actually measure the earth's electric field.
(It is about 200V/m if I recall properly.) Interestingly it is affected by
the solar flux and solar
-locked loop and alternately uses the sensors for transmitter
and receiver, swapping ends at about 74 Hz, to get a two way signal. This
method cancels most errors. It has temperature and velocity outputs.
cheers, Neville Michie
On 24/05/2014, at 11:16 AM, Mark Sims wrote:
I am building a weather
as the sites appear to be available
to everyone else.
I bought the Nautical Almanac but it does not have such information.
It is very hard to find alternate sources of the data.
cheers,
Neville Michie
On 24/03/2014, at 11:06 AM, Paul wrote:
On Sun, Mar 23, 2014 at 7:02 PM, Neville Michie namic
resolution.
There is probably more to this than meets the eye, but where does one
find out about it?
cheers,
Neville Michie
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Hi Paul,
could you give a hint how long ago you released the front end to T_N?
thanks
Neville Michie
(Sydney)
On 21/02/2014, at 8:29 AM, paul swed wrote:
Chuck thats easy. Because I could make it work. :-)
That said there was a post on time-nuts about LORAN C receiver in software.
I
certain stepping without pole-ing.
The clock originally used 1.2 volt pulses, alternate polarity about 20 mS long.
You can trade off these values and still get smooth certain operation.
Cheers,
Neville Michie
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in a bridge circuit with a voltmeter, so they are many orders of magnitude
easier to use than a 100 ohm PRT.
They are made small enough to get them in close contact
with the object to be measured.
If you want to know about humidity measurement I can tell you much about that,
cheers,
Neville Michie
they do does not seem possible from just a series of position fixes.
cheers,
Neville Michie
On 22/11/2013, at 7:45 AM, tmil...@skylinenet.net wrote:
If you want true north, set up a camera that has time or bulb shutter at the
south end of your property. Put in a marker stake. take a time
to
test and adjust each element of the system, so I need to log timestamps.
cheers, thanks for the input,
Neville Michie
On 26/10/2013, at 4:48 PM, Hal Murray wrote:
namic...@gmail.com said:
There used to be all sorts of Monitor programs for PCs but I can not see any
on recent machines. I want
. The
device looks ideal for this task.
thanks,
Neville Michie
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be an effect.
Cheers,
Neville Michie
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to sidereal seconds, but
how do you synch.
the seconds? This is where the Lady helps. But I do not know how I can get
really accurate
seconds markers as convenient as the PPS from my Thunderbolt.
cheers,
Neville Michie
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would show sidereal time!
It is now just a matter of watching the screen and listening to the ticks of
the clock.
thanks Mark, and the others,
cheers, Neville Michie
On 18/12/2012, at 2:33 PM, Mark Sims wrote:
Yes, you can have a GPSDMC (GPS disciplined Mayan calendar). You can also
But does it have an output of Sidereal Time?
cheers,
Neville Michie
A Merry Season to all.
On 18/12/2012, at 11:02 AM, Mark Sims wrote:
BTW, Lady Heather has support for several versions of the Mayan and Aztec
calendars. Also Druid, Herbrew, Islamic, Indian, and many others
. A
soldering iron fixed them very quickly.
The serial numbers were widely separated, so it was not an unlucky batch
problem.
cheers,
Neville Michie
On 16/11/2012, at 1:57 PM, Chris Howard wrote:
You all were right, my targeting of the 50 ohm resistor
across the oscillator output does not seem to have
I have found a pic of the dry joint,
this one was just a dry joint with resin insulating the connection,
the other never had any solder applied.
cheers, Neville Michie
On 17/11/2012, at 11:09 AM, Chris Howard wrote:
Maybe that is my problem. I definitely have a problem.
I am able
get a delayed history of the surface temperature.
A good oven runs rings around deep earth stability.
cheers,
Neville Michie
On 26/09/2012, at 3:32 PM, Tom Van Baak wrote:
How good a clock could you get at much lower power? I guess I'm looking for
something (logarithmically) between a watch
Does anyone know about what technology is used in Swiss watches to get much
better performance from
their xtals than you might expect?
I assumed that they had look up lists to insert extra counts to compensate for
ambient variations,
but I have never heard any details.
cheers,
Neville Michie
changes.
cheers,
Neville Michie
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not make a system reliable enough to insert a
leap second
it probably cannot handle any other unexpected insult, and that may have far
worse consequences.
Just my 2p worth,
Neville Michie
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the longterm record of the sidereal long case will
have no phase jumps.
Also it seemed like a good idea, and the more it seems difficult, the more it
needs to be done.
cheers,
Neville Michie
On 16/06/2012, at 5:51 PM, Ken Duffill wrote:
Hi,
First of all why would you want Sidereal Time
of
one of those.
How you would find ST to a microsecond is not obvious. How do radio astronomers
do it?
cheers,
Neville Michie
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, Neville Michie
On 02/03/2012, at 10:14 PM, mike cook wrote:
Le 02/03/2012 05:13, Neville Michie a écrit :
A possible solution is to take mean time (from a TBolt 10MHz) and
divide it by 9,972,695.7 to give a PPS(sid) signal that can run a
digital clock dial and give one second(sid) ticks
to check
time against the stars.
cheers,
Neville Michie
Sydney
Australia
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Hi,
I have two of Morion MV89A, one is prominently marked (RoHS 5).
I assume that means lead-less solder. Pure tin solder is much more
prone to
crystallised joints which break later.
Are these the dodgy units ?
cheers, Neville Michie
On 26/02/2012, at 11:02 AM, John Miles wrote
response.
Would that not be great for huge spikes!
cheers,
Neville Michie
On 17/02/2012, at 9:07 AM, Peter Monta wrote:
Time is money...
I wonder if long-distance neutrino links might be attractive to the
financial community. The SNRs are currently way too low, but with
aggressive engineering
.
Maxwell did not hypothesise about radio waves. He just followed his
genius nose
developing one mathematical expression from another. In this case the
time had not come,
it took four other scientists years to discover what he had done.
cheers,
Neville Michie
On 10/02/2012, at 3:23 AM, Chris
clock to a second or better,
and reach the limit of stability of the atomic clock.
cheers, Neville Michie
On 29/01/2012, at 3:46 AM, aartmol...@comcast.net wrote:
The star catalog specifically designed for lunar occultations is
the XZ (I'm guessing it stands for eXtended Zodiacal) Catalog
around, the position of the
sun on the horizon
is rock steady and is adjusted by the thimble for coincidence. The
elevation is then
read off the vernier. A theodolite needs a solid base to work from
and would be useless
on a ship.
cheers,
Neville Michie
On 25/01/2012, at 12:52 PM, Jim
,
Neville Michie
On 25/01/2012, at 12:52 PM, Jim Lux wrote:
On 1/24/12 3:19 PM, J. Forster wrote:
Is the USNO almana/ephemeris still published in hard copy every
year? That
had moon timing, etc.
You can download pieces from the Astronomical Applications website
at USNO.
Or you can buy a copy
allows a mean time clock to show the time of noon each
day (passage of the Sun
through the meridian)
cheers,
Neville Michie
On 24/01/2012, at 3:59 PM, J. Forster wrote:
At the solstices, the derivative of the declination goes through just
about to zero, just like a sine wave.
-John
it is mainly air.
I wonder if TVB knows what the brown foam in 10811 is? Does it have a
radiation absorbing powder in it?
cheers, Neville Michie
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Does the FE-5680A have a similar Rb cell to the LPRO-101?
If so do they have finite lamp life, (can you find the one you buy
has little life left?)
Or by not reporting the status of the lamp no-one worries about it?
cheers,
Neville Michie
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are not metric but imperial, 19 threads per inch?
Incidently the Whitworth threads, with included angle of 55 degrees
and coarse pitch are ideal
for soft materials like Plexiglass (perspex, methyl methacrylate).
cheers,
Neville Michie
On 17/12/2011, at 5:48 AM, J. Forster wrote
be a nearby box containing a Rb or GPS
time standard.)
A second or two may be needed for them to reorganise if they are moved.
It must be possible to design them, but an elegant design has eluded me.
Merry Solstice,
Neville Michie
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from first principles.
At least with metric you can keep looking until you find 5 books that
agree, you can see the value with
the slipped decimal, and then you may have values that may be
reliable or at least stolen from the same source.
And you get your answer in Watts.
cheers,
Neville Michie
that
added or subtracted from the force of gravity
on the bob. The field was applied for several cycles until the
observed error was corrected.
A PLL could use this to correct a pendulum.
cheers, Neville Michie
On 12/12/2011, at 8:32 AM, Brian, WA1ZMS wrote:
This was talked about several years
Has anyone thought about the fact that verticals converge towards the
centre of the earth?
The surface distance is greater than the distance at a depth.
A map distance is made less, a few hundred metres underground.
Just another thought,
Cheers, Neville Michie
Thanks John,
I should be able to sort it out now.
thanks,
Neville Michie
On 29/10/2011, at 7:57 PM, John Miles wrote:
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-
boun...@febo.com] On Behalf Of Neville Michie
Sent: Friday, October 28, 2011 9:30 PM
obvious that I am missing,
cheers,
Neville Michie
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Now if tvb had loaded up his van with caesium clocks and driven back
and forth between the two stations several times, then corrected for
altitude/gravity effects, would he not have revealed the timing problem?
cheers,
Neville Michie
On 16/10/2011, at 8:46 AM, Jim Palfreyman wrote:
http
press, runs with full revs
but stops when the drill jams.
It will be a pity to see them turn to unobtainium.
cheers,
Neville Michie
On 12/10/2011, at 9:05 AM, Mark Sims wrote:
I now have my house converted over completely to LED bulbs... over
300 of them (mostly PAR16/PAR20/PAR30/PAR38
That looks like a great solution for monitoring oscillators/GPSDOs.
Where to find an application that inputs RS232 and writes a file?
cheers,
Neville Michie
On 04/10/2011, at 6:54 AM, Tom Van Baak wrote:
Hal, Don,
I too have tried all the PC-based (serial/parallel port) solutions.
As we
I may be a bit naive,
but how would physically carrying several caesium clocks
back and forth compare to these fibre optic methods?
cheers,
Neville Michie
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seem to me
to be a problem of the measurement system rather than the item being
tested.
Cheers, Neville Michie
On 23/09/2011, at 9:07 AM, Rick Karlquist wrote:
Perry Sandeen wrote:
Wrote: Doing what you describe will result in a very sensitive
humidity
sensor, having eliminated
Thanks Randall,
It downloaded from you OK,
I too could not get it directly in Sydney.
cheers,
Neville Michie
On 09/09/2011, at 8:32 AM, Randall Prentice wrote:
Have uploaded a copy in NZ.
http://prento.homelinux.net/1796.pdf
Couldn't download off TelstraClear, had to use Actrix links
or so.
cheers,
Neville Michie
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expected life.
cheers,
Neville Michie
On 18/07/2011, at 1:59 PM, Chuck Harris wrote:
For all of this attention to cooling the oven on the Rb standards,
has anyone seen any failures that are attributable to heat?
I sort of doubt it.
-Chuck Harris
ewkeh...@aol.com wrote:
I monitor and fan cool
because few homes have 3 phases.
cheers,
Neville Michie
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An interesting question about making a 50/60 hertz source,
Does a 120 to 12 volt transformer have enough inductance to use as a
12 to 120 volt transformer?
Remember, the inductance is proportional to the square of the no of
turns, where as voltage is proportional.
cheers,
Neville Michie
Mine did!
Sad to hear of his departure,
Neville Michie
On 21/06/2011, at 1:05 AM, Poul-Henning Kamp wrote:
In message 4dff5c52.4070...@erols.com, Chuck Harris writes:
One important thing to note is he wasn't wearing his seat belts.
Does a 1969 VW Beetle even have them ?
--
Poul
TRY http://www.vk7krj.com/ham_stuff.htm
Neville
On 12/06/2011, at 6:58 AM, Ken , VK7KRJ wrote:
Aarghh- it's too early in the morning for thinking- here is the url!!
http://www.vk7krj.com/ham_stuff.html
On 2011-06-12 06:55, Ken , VK7KRJ wrote:
It's not up to time-nuts standard, but here is
that were in the original.
cheers,
Neville Michie
On 19/05/2011, at 9:35 PM, Chuck Harris wrote:
An actual quartz analog wristwatch wouldn't do something so mundane as
to use a 50uf capacitor to drive the coils. They do this:
DRIVER-A-COIL
on at least 4 different types of quartz
clock, usually from a 5 volt
logic signal.
Cheers,
Neville Michie
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and follow
polarity
quartz clock motor?)
It can also be done with a micro if you have the skills.
cheers, Neville Michie
On 16/05/2011, at 8:02 PM, iov...@inwind.it wrote:
The background of my request is an OT story. Just to mention
briefly, I already
have an ordinary (non-radio-controlled) clock machine
pulse is added to the count chain. The
output is thus shifted to a higher
frequency.
If you are interested I can try to design the circuit for you, I have
intend to build a Siderial clock
dial for my TBolt.
cheers, Neville Michie
On 17/05/2011, at 7:58 AM, iov...@inwind.it wrote:
Neville
?
I have inserted the 3 silicon diodes into the 5V supply line to suit
the micro.
I hope answers to my questions will help many other TBolt users.
Cheers,
Neville Michie
On 12/05/2011, at 4:40 PM, David Bobbett wrote:
Both myself and a few other time-nuts have had a problem with the
LCD
in a
laboratory, as the AC magnetic field
drives them crazy.
I am thinking of lock in amplifiers and phase locked loops.
Also toroidal coil or paired coils.
Can anyone in this group point me to an easy to construct and
fiercely accurate design to build?
cheers, Neville Michie
in
the planets rotation, i.e. the rate of rotation stays the same but
the time of sunrise has shifted slightly.
Maybe that someone who knows about these things will tell us more.
cheers,
Neville Michie
On 16/03/2011, at 12:29 AM, jimlux wrote:
On 3/15/11 6:20 AM, jimlux wrote:
On 3/15/11 1
supply.
A 20 AH battery gives more than 2 days backup. As the 12Volt is the
sensitive input, the linear regulator should keep the noise down. The
whole setup is designed to use minimum power.
cheers, Neville Michie
On 11/02/2011, at 10:16 AM, Larry McDavid wrote:
Greetings! I am a new member
into a homebrew BCD DAC which is
recorded by a HOBO logger to give very accurate logging of phase for
whichever clock the proximity is clipped to.
It is all low power, saves serious frequency counters, PC et. al. so
you can log continuously for years without a major power bill.
cheers, Neville Michie
by by changing the side arm temperature.
cheers, Neville Michie
On 20/01/2011, at 6:55 AM, Magnus Danielson wrote:
On 01/19/2011 06:44 PM, Poul-Henning Kamp wrote:
In messagedbb70463b9d04f6589fbf97b2e4be...@vectron.com, Bob
Camp writes:
Conventional gas cells have a finite lifetime
.
cheers, Neville Michie
On 20/01/2011, at 12:37 PM, Philip Pemberton wrote:
On 19/01/11 14:57, Poul-Henning Kamp wrote:
Try a mild acid like citric (lemon-) or citric (vinegar).
Vinegar would be acetic acid, the same stuff that's used in
photographic stop bath (although there are some 'non
to migrate through the glass
into the bulb. Sodium accumulated in the bulb.
It is obviously a slow process, but then you did not need to put much
Cs in the bulb.
Why not use it to recharge an alkali metal lamp?
cheers, Neville Michie
On 12/01/2011, at 11:06 AM, scmcgr...@gmail.com wrote
It sounds like you need to dip a corner of the device in liquid nitrogen
and allow the metal to evaporate and condense in the cold corner.
Or is it sublimation.
I do not know how long it would take.
cheers, Neville Michie
On 13/01/2011, at 11:31 PM, Chuck Harris wrote:
I suppose that would
have been using off the shelf data loggers instead of
the Rustraks.
cheers, Neville Michie
On 03/01/2011, at 7:14 AM, asma...@fc.up.pt wrote:
Hello!
I need to change the 60 Hz motors of my recorders for using
them here in Europe. I found a suitable replacement for
230 V/ 50 Hz but I need to re
or 60kHz) which will then
divide down to 60Hz
with very little phase noise. The only difficulty is the need for a
reset that is synchronised
with the PPS signal. (use a D latch or two)
cheers, Neville Michie
Recently I bought a Efratom Ru frequency standard from eBay and a
frequency
that the foil is always normal to the thermal gradient.
The project is not finished yet but the thermal insulation is now
going to be many times better than with just thick slabs of foam.
cheers,
Neville Michie
On 26/11/2010, at 6:24 PM, beale wrote:
In an attempt to educate myself about temperature
.
If you make a sandwich with N layers of metal foil, the radiation
transmission is reduced by 1/N.
Cheers, Neville Michie
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but no straight blade screw drivers.
cheers,
Neville Michie
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