Er, are we being sloppy here rounding 17 to 20? Or do the weirder countries
[ie not Australia :-)) ] use 20 ? I thought it was bad enough rounding 16
2/3 [16 and two thirds] to 17 !
My home system used a motorised exchange ringer running at 16 2/3 . Had to
replace the contacts with standard
On Jun 29, 11:20 pm, John Rehwinkel jreh...@mac.com wrote:
The vast majority of line powered clocks use
the grid frequency for timing, both analog and digital. It's great
because I can set all the clocks and they all stay exactly in sync
with one another.
Oh, they still will. They'll
Probably the best method would be to build a WWVB or GPS 60Hz
synchronized clock and designate that one a master and feed the others
with that signal. Another possibility would be to build a small 60 Hz
alternator with a WWVB or GPS synchronized phase locked loop to
control it's frequency and
On 11-07-01 02:43 AM, JohnK wrote:
Er, are we being sloppy here rounding 17 to 20? Or do the weirder
countries [ie not Australia :-)) ] use 20 ?
I have always heard of 20Hz. ATT and ITT divided the world up at one
time, with North America being ATT and the rest of the world being ITT.
ITT
Very sweet. I collect WECO gear like 550/551/556 cordboards and Pre 1960s dial
sets, including the earliest dial subscriber sets like the AA1, 102 and 200
series phones. I had a 1a2 key system in my house from high school until the
late 1980s when Panasonic introduced the KXT616 analog PBX. My
The vast majority of line powered clocks use
the grid frequency for timing, both analog and digital. It's great
because I can set all the clocks and they all stay exactly in sync
with one another.
Oh, they still will. They'll just all be wrong.
- John
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You received this message because
On Jun 30, 1:01 am, JohnK yend...@internode.on.net wrote:
- Original Message -
Subject: Re: [neonixie-l] Re: US power grid frequency tests.
The vast majority of line powered clocks use
the grid frequency for timing,
All this talk of line frequency reminds me of when we attached
On 6/30/11 8:25 PM, A.J. Franzman wrote:
All this talk of line frequency reminds me of when we attached a 'powerful'
audio sig gen to the lecture room clock back in 1968. Got us 10 mins less
boredom.
I always wondered just how
it was done, and the size of the hardware that would be required.
You must be a real phone fan to know that proper ring generation is at 20Hz,
I'm impressed!
On 2011 Jun 30, at 20:34 , David Forbes wrote:
I used to own an HP 201B audio signal generator. It was powerful enough to
ring a telephone bell, providing 100V RMS at 20 Hz.
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You received this
On 6/30/11 9:30 PM, Wayne de Geere III wrote:
You must be a real phone fan to know that proper ring generation is at 20Hz,
I'm impressed!
On 2011 Jun 30, at 20:34 , David Forbes wrote:
I used to own an HP 201B audio signal generator. It was powerful enough to ring
a telephone bell,
I just knew you would do something like that! Now I will make a small
temperature controlled oven for the crystal and we be happy!.You
make the best nixie power supplies BTW...regards...
On 29 June, 16:51, taylorjpt j...@tayloredge.com wrote:
I did this for fun a while back. It uses
On Jun 24, 6:10 pm, H. Carl Ott hcarl...@gmail.com wrote:
Of possible interest. A lot of my clocks use the grid as a reference.
http://goo.gl/KhgtQ
carl
What are they smoking? The vast majority of line powered clocks use
the grid frequency for timing, both analog and digital. It's
In fact this is the controller I may use:
http://www.w6pql.com/crystal_oven_controller.htm
On 29 June, 19:53, neutron spin mrstan...@charter.net wrote:
I just knew you would do something like that! Now I will make a small
temperature controlled oven for the crystal and we be happy!.You
I have always wondered what do you do when there is a power
outage?Also do the utilities account for any outages or does that
even matter? Yes, Yes I know you just reset the master line clock
after the outage and all is well...regards...
On 29 June, 20:00, James jamesrsw...@gmail.com wrote:
I think you could put a 32768 xtal, a trim cap, and an 8 pin AVR (my
preference) onto a very small pcb for about dollar or two.
The advantage of using a micro is that could also add a simple
calibrate function.
For people who like to solder. (but don't like to code).
Great idea...sometimes the simple designs are the most
effectivethe only drawback of course for any of these crystals is
the temperature effect on the crystal and drift. We are not dealing
with NBS traceable standards here but if you a real sticklerI have
some Cesiumjust kidding...the
On Tue, Jun 28, 2011 at 11:37 AM, neutron spin mrstan...@charter.net wrote:
Great idea...sometimes the simple designs are the most
effectivethe only drawback of course for any of these crystals is
the temperature effect on the crystal and drift. We are not dealing
with NBS traceable
32.768KHz has a nice property that it oscillates 2^15 times per second
which makes the timer math easy...I made a calc using the average
tolerance of these crystals and came out to an accuracy of around
0.002 % accuracy or better - about 2 seconds a day. This of course
does not account for
On 6/28/11 10:03 AM, neutron spin wrote:
32.768KHz has a nice property that it oscillates 2^15 times per second
which makes the timer math easy...I made a calc using the average
tolerance of these crystals and came out to an accuracy of around
0.002 % accuracy or better - about 2 seconds a day.
On 06/28/2011 01:13 PM, H. Carl Ott wrote:
On Tue, Jun 28, 2011 at 1:03 PM, neutron spinmrstan...@charter.net wrote:
32.768KHz has a nice property that it oscillates 2^15 times per second
which makes the timer math easy..
A little trickier dividing 32768 down to 60hz though.
Anybody got a
I recently completed a Kabtronics Nixie clock that uses line
frequency. Now I'm going to have to add a 60Hz generator to it.
Thanks for the link.
On Jun 26, 11:05 am, neutron spin mrstan...@charter.net wrote:
It's a conspiracy between Elm electronics the FERC.
You are quite welcome. The chip is actually a microcontroller that
coded to produce the 60, 50 or 1 Hz signals. The 60 Hz version will
flip back and forth between the grid freq and the micro. I think it
is a Microchip MCU but not sure. Simple way of ensuring the clock
always has a clock
It's a clever idea, shouldn't be too hard to implement in an equivalent
AVR chip (Tiny12) or whatever. At $10 a pop, given the number of clocks
I have, it'd definitely be worth writing some simple code. I was already
planning on doing the 60hz generator uC code, the colorburst crystal
Personally I am going to use my old standby. the Heliochronometer
On 27 June, 16:03, J Forbes jforbnos...@selectric.org wrote:
I wonder how I'm gonna get that neat flapper mechanical clock to keep
time after the experiment starts? Or my scope clock? or my TTL nixie
clock? or my old Cathode
Ya, I certainly don't mind supporting other people's work. It's a
time/cost tradeoff in my case, though. I have probably 10-12 clocks that
I'd like to modify.. for $100ish dollars, it is worth it to me to put in
the hour of work. If it was less money (or more difficult) then I
wouldn't mind it
On 11-06-27 02:21 PM, Adam Jacobs wrote:
the colorburst crystal surprises me, though. Is the colorburst crystal
higher accuracy than a standard cheap 8mhz or whatever? The only thing I
know of colorburst crystals from is that they are popular in 80m
homemade CW rigs for obvious reasons.
I
http://www.elmelectronics.com/ebench.html#Oscillators
| Larry unmitigated_f...@earthlink.net wrote:
| I recently completed a Kabtronics Nixie clock that uses line
| frequency. Now I'm going to have to add a 60Hz generator to it.
| Thanks for the link.
If you can change the input source (3.58MHz
Also many of the cheaply designed nixie clocks just use a cheap 4 Mhz
or whatever the design uses and these are usually rated at 10 to 20
PPM. Color burst crystals can be found with similar tolerancesso
what's the difference unless you are using temperature compensated
oscillators..I
On 6/27/11 5:09 PM, threeneurons wrote:
A typical crystal has 30 to 50 ppm accuracy, or between 15 to
26 minutes off, in a year. You'll get no improvement with a common
crystal. You might just as well just stick with the line sync, and
just occasionally hit that minute button, to correct the
We have about eight clocks here that we use to tell time at home
regularlythey ALL are based on line frequency!
Maybe we need to get a mast protest going, have everyone you know mail
at least one line frequency based clock to Joe McClelland, head of
electric reliability for the Federal Energy
It's a conspiracy between Elm electronics the FERC.
http://www.elmelectronics.com/ebench.html#Oscillators
On 26 June, 11:35, J Forbes jforbnos...@selectric.org wrote:
We have about eight clocks here that we use to tell time at home
regularlythey ALL are based on line frequency!
Maybe we
On Jun 25, 5:04 pm, Instrument Resources of America
iracosa...@hughes.net wrote:
I agree. I wonder what is REALLY behind this?? Something smells
rotten with this.!!! Ira.
Indeed. Normally the 60Hz runs low during the day and makes it up at
night. The frequency drops due to large
I think the original idea of grid frequency maintenance is when clocks were
purely mechanical before the digital era. They of course were just
synchronous A.C. motors that were terribly inaccurate without the
synchonization to the power grid's frequency. This also was before GPS and
A LOT of today's 'digital' clocks are still locked up to the power line
frequency, which is still the quickest, easiest, most in expensive way
of maintaining accuracy. Some are locked to either GPS or NIST 60 khz
broadcasts.Ira
On 6/25/2011 5:14 PM, neutron spin wrote:
I think the
Yes ...that was a clever and (cheap) method of creating a relatively
accurate time base but with modern technology there really is no reason to
keep this method. Of course existing designs that use the grid's
frequency are going to have to live with it. Similar to going from analog
TV
Now we're all going to need to GPS or use an atomic time standard to discipline
our mechanical flip clocks like http://leapsecond.com/pages/atomic-nixie/
On 2011 Jun 25, at 19:14 , neutron spin wrote:
I think the original idea of grid frequency maintenance is when clocks were
purely
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