Hi!
Taking a 10MHz signal from a rubidium clock to an external device it is
better
to use 0.5-1Vrms sine wave or TTL? A 75 ohm coaxial cable will be used
with
just 1 meter long. In any case the receiver will be made around a
unbuffered
gate with self biasing (it seems that the 74AC type has
On 1/19/14 10:31 PM, Chris Albertson wrote:
On Sun, Jan 19, 2014 at 6:41 PM, Lizeth Norman normanliz...@gmail.comwrote:
Is it possible to write (assuming the poor little creature would do it) a
piece of code, that given your lat/long, the time and a two line element
set for an orbiting
here's the latest version..
I'm not sure the sign is right on the rate adjustment.
It will allow a time set in two different ways:
Unix time as Uunixtime
or
conventional time as Tmmddhhmmss
I haven't tested it with the mechanical clock yet, but the basic code to
control the clock is in
Hi,
Anyone currently using the Handar 541A receiver and/or have any new information
to share since the last posting(s) here on March 8, 2008?
Thanks,
Jerry
WA0UZI
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Hi
If
1) Your table of errors at noon is always good to 0.1 second and it has no
cumulative error (you did it on a PC with a fancy math pack).
2) Your timer has a resolution of 0.1 second.
3) Your basic time source is accurate. (it’s not the issue here).
You will always be right at noon to
On 01/20/2014 01:23 AM, David J Taylor wrote:
Is it possible to write (assuming the poor little creature would do it) a
piece of code, that given your lat/long, the time and a two line element
set for an orbiting object, such as the ISS, that would give you the
acquisition of signal
On 1/20/14 8:48 AM, Bob Camp wrote:
Hi
If
1) Your table of errors at noon is always good to 0.1 second and it has no
cumulative error (you did it on a PC with a fancy math pack).
2) Your timer has a resolution of 0.1 second.
3) Your basic time source is accurate. (it’s not the issue here).
On 1/20/14 9:20 AM, Jim Lux wrote:
Interestingly, it occurred to me that one could just add a sufficiently
large deviation random number to the period each time to dither it.
The rate changes once per hour (per tvb's EOT routine), so there's
3600 ticks at a given rate. If I were to vary the
Hi
There are *lots* of ways to do any sort of code. I can’t think of any practical
problem that has a single unique “best” way to do it. All I’m trying to say is
that there is a way to get the job done (to much better accuracy than you need)
with what you have. If there’s one way, there must
On 1/20/14 9:48 AM, Bob Camp wrote:
Hi
There are *lots* of ways to do any sort of code. I can’t think of any practical
problem that has a single unique “best” way to do it. All I’m trying to say is
that there is a way to get the job done (to much better accuracy than you need)
with what you
On 1/19/14 1:51 PM, Tom Van Baak wrote:
Use 24h clocks for
best results. They can be had from www.clockkit.com, an excellent
source of DIY quartz clock parts.
I couldn't find 24hr movements on the clockkit.com site.. where are they?
___
On 1/20/14 10:06 AM, Jim Lux wrote:
On 1/19/14 1:51 PM, Tom Van Baak wrote:
Use 24h clocks for
best results. They can be had from www.clockkit.com, an excellent
source of DIY quartz clock parts.
I couldn't find 24hr movements on the clockkit.com site.. where are they?
Hi
So really it boils down to :
http://www.klockit.com/products/dept-379__sku-bbbii.html
Since that already has a full driver on it (battery / oscillator / chip) - you
will need to do some surgery to get directly at the stepper motor. (or am I
missing something?)
Bob
On Jan 20, 2014, at
So here's my next idea..
Set up a 24 hour movement (no minute hand) so that you have the sun
moving around the dial: at the top at solar noon, with the rate being
reasonably constant around the dial(e.g. using the solar clock
algorithms developed)
Then, have two other pointers or sectored
Hi
I realize this is *exactly* what the OP didn’t want to do, but ….
A PI or any of the little dedicated ARM + GPU gizmos driving a cheap junk HDMI
monitor or TV would make for a very nice display of all that data… The total
cost could still be under $100. With Linux running on the “gizmo”
I hope this will fall within the Time-Nuts interested. I recently spend some
time with a neighbor who does ornamental machining and cutting of gems. We got
into a discussion of time as an art form. He was telling me about a gentleman
in South Centeral Colorado that makes his living making a few
I had fun with a Jefferson Mystery Clock (e.g. 370956057565); the
synchronous motor can be replaced with a stepper. 1.8 deg per step works
out just right for the gearing. it's a gas, and an arduino will drive a
simple stepper.
Don
Jim Lux
So here's my next idea..
Set up a 24 hour movement (no
From: NeonJohn
Hey David,
There's an amateur radio program for just that purpose. Several, in
fact. Here's one:
[]
John
___
John,
Due to the wretched quoting in Windows Live Mail your comments should
actually have been addressed to someone else.
On 1/20/14 11:00 AM, Bob Camp wrote:
Hi
I realize this is *exactly* what the OP didn’t want to do, but ….
A PI or any of the little dedicated ARM + GPU gizmos driving a cheap junk HDMI
monitor or TV would make for a very nice display of all that data… The total
cost could still be under
But the current code doesn't try to accumulate errors and adjustments..
it just looks up the rate from the equation (floating point) and jams it
into the tick generator.
Jim,
For an application like this it might be best for your EOT table to contain
phase, not rate. Your code can adjust
Message: 3
Date: Mon, 20 Jan 2014 10:49:50 -0800
From: Jim Lux jim...@earthlink.net
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: [time-nuts] more solar clock stuff
Message-ID: 52dd6fce.5060...@earthlink.net
Content-Type: text/plain;
Hi
My concern was as much for setting an upper cost limit for a one off gizmo.
More or less - if I can get something cooler for $100 - would I do that
instead?
Cool is indeed highly subjective and yes running cost does count at some level.
Bob
On Jan 20, 2014, at 3:11 PM, Jim Lux
That listing is a bit vague about if it has a second hand. For the kind
of pulse drive that has been discussed here, it seems you would want a
definite second capability and step vs. smooth second hand drive.
I know nothing except a little web searching, but this one seems to have
the right
On 1/20/14 3:32 PM, Rex wrote:
That listing is a bit vague about if it has a second hand. For the kind
of pulse drive that has been discussed here, it seems you would want a
definite second capability and step vs. smooth second hand drive.
I know nothing except a little web searching, but this
Hi Nigel,
Yes, I had tried Tboltmon v 2.60 but probably because it was very late
and a senior moment I didn't notice the GPSTM tab which precisely have
the lights function that I was talking about, thank you for the hint.
The capability of turning the lights is not important, it is just
Since most of those cheapo movements are a simple single-coil motor, energized
with alternating polarity short pulses, it would seem that there is no need for
a 24 hour movement. You can just have your micro pulse it twice the normal
period, but with the same as normal pulse width(s). Check out
Tim Hunkin has made a similar clock, see
http://www.timhunkin.com/27_domestic_clocks.htm
The elephant clock down the bottom of the page indicates the moon's phase
in a very innovative way. Mind you the night day sectors are equal, so
they are for the equator, not for the maker's lattitude of 50
I think there is a slight flaw in slowing the drive to half rate. The
hour hand could then go around once in 24 hours, but the minute and
second hand movement is halved too. Rather non-intuitive to read unless
you only put on the hour hand and make a new 24-hour dial face.
On 1/20/2014 5:57
Jim, I think you missed the main point I was trying to address.
It seems that many of the newer quartz movements do not move the second
hand in one-second steps. They move it in some way that appears smooth
to a human observer. (Even if there is no actual second hand, the same
motive issues
Here's another twist on this which I don't think anyone else has suggested.
Make a sun dial with a movable and computer controlled gnomon that corrects
for the equation of time and always reads correct mean time. Except on a
cloudy day.
Regards.
Max. K 4 O DS.
Email:
On 1/20/14 5:57 PM, Robert LaJeunesse wrote:
Since most of those cheapo movements are a simple single-coil motor, energized with alternating
polarity short pulses, it would seem that there is no need for a 24 hour movement. You
can just have your micro pulse it twice the normal period, but
On 1/20/14 6:15 PM, Chris Albertson wrote:
On Mon, Jan 20, 2014 at 6:54 AM, Jim Lux jim...@earthlink.net wrote:
On 1/19/14 10:31 PM, Chris Albertson wrote:
On Sun, Jan 19, 2014 at 6:41 PM, Lizeth Norman normanliz...@gmail.com
wrote:
This is why I am a fan of the Teensy3... It's a
I currently have my router/firewall acting as both an NTP client, getting
it's time from the net, and an NTP server serving my home network. Now I
have my thunderbolt and Lady heather working nicely, I would like to have
that machine act as the ntp server for my network, but it appears ntp can't
Is this possible to do, and if so, can anyone give me some clues as to how?
ntpd works fine with Thunderbolts. It's the Palisade driver, 29. If that's
not enough of a hint I'll say more.
ntpd basically sends a few setup commands to put the TBolt into a mode where
it sends packet types X
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