Re: [time-nuts] 3GHz prescaler for Pendulum counters

[GandalfG8--- via time-nuts]

So much for paranoid file hosting systems with OTT encryption!,  the URL 
for the photos got truncated in the copying:-(
 
Just adding "g" to the end of the link in my original post should suffice,  
or here, with a bit of luck:-), is the full link...
 
   
https://mega.nz/#!qNYiDCzC!HHWEpI8TUDW6VO_fuyk34uU6Tr4V-pXRLru-DMtaq2g

 
Regards
 
Nigel
GM8PZR
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Re: [time-nuts] UPS for my time rack

[Hal Murray]

gign...@gmail.com said:
> Those traco power units are fantastic. Absolutely great. 

I first encountered power "bricks" 10 or 15 years ago.  They come in various 
sizes.  Full brick, half-brick, and quarter-brick were common when I was 
watching, with the usual blizzard of output voltages.  They are made by many 
vendors.  There is lots of competition on two fronts: efficiency and 
watts/package.

I think the original ones were targeted at phone company applications since 
they ran off 48 V.  (That may have just been the ones I was paying attention 
to.)  Other input voltages are also common.  The input voltage typically has 
a 2:1 range.

The pinouts are reasonably standard.  I don't know if there is an official 
spec or everybody else copies the first company to get something good on the 
market.

-- 
These are my opinions.  I hate spam.



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Re: [time-nuts] KS-24361 REF-0 standalone

[Daniel Watson]

Hi,

It looks like Synergy makes some really nice devices. Actually, I now know
first hand that they do. I'm sure their module would be an excellent choice
for some applications.

I've made some progress on my own REF-0 project and the Denuo GPS board.
I've also decided to expand the scope and tackle the much larger challenge
of making a board that is fully Oncore UT+ compatible, not just REF-0
compatible. That is not a simple task by any means, but it should be
interesting. My personal use for this board would be to upgrade my REF-1s.
Perhaps there are other applications...

http://syncchannel.blogspot.com/2015/10/denuo-gps-retrofit-board.html


Thanks,

Dan W.
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Re: [time-nuts] 3GHz prescaler for Pendulum counters

[cfo]

On Wed, 14 Oct 2015 17:36:01 -0400, GandalfG8--- via time-nuts wrote:

>  that they
> also work with the PM6680, 

I mounted a 3GHz prescaler in my PM6680B a month ago.

And the only thing Pavel told me to be carefull off. Was that Vmax was 
5v. as opposed to the original that was 12v i think.
He also mentioned that the board prob. would go to 3.5GHz

I tried it out with my Agilent E4432B that max out @3GHz , and it worked 
excellent. 

CFO
Denmark

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Re: [time-nuts] How did they distribute time in the old days?

[Kenton A. Hoover]

You are really late to this party. Current comptition is how many diffenent 
types of clocks can be driven with PoE -- know someone trying to do Nixie 
with it. 

Sent from my iPhone

> On Oct 14, 2015, at 09:42, Nick Sayer via time-nuts  
> wrote:
> 
> 
>> On Oct 14, 2015, at 4:42 AM, billriches  wrote:
>> 
>> Not milisecond time distribution but time related!
>> 
>> In the early half of the 1900s Western Union was in the time business.  They
>> would rent businesses such as banks, office buildings, etc  clocks for a few
>> dollars a month.  These were pendulum wall clocks that had 2 #6 dry cell
>> batteries inside that would wind them every hour or so. The clocks were
>> connected to the WU telegraph line and for a minute before and after  the
>> top of the hour all traffic on the circuit would stop.  Exactly at the top
>> of the hour they would push a pulse of 50 ? volts or so over the line and it
>> would reset the clock to the top of the hour.
> 
> The WU standard time service goes back further than the turn of the 20th 
> century. It started in 1870.
> 
> I’ve always wanted to get my hands on one of those clocks and come up with a 
> circuit to recreate the synchronization signal for it, probably with a 
> Raspberry Pi running ntpd and a big ol’ MOSFET. The problem is that at this 
> point, those clocks are quite expensive once they’re reconditioned.
> 
> My understanding (perhaps incorrect) was that the sync pulse was once daily 
> and, as you said, would cause the hands to “snap” to 12. The trailing edge of 
> the pulse was synchronized and would release the clock to operate normally.
> 
> That they had something as accurate and widespread as it was so early is 
> astonishing.
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Re: [time-nuts] How did they distribute time in the old days?

[Ralph Smith]

I drive one of my Self Winding Clock Company/Western Union clocks using the NTP 
server I built using a Trimble Thunderbolt and a Soekris Net4501. I use a GPIO 
line to drive a simple transistor switch using the same 3 volt battery that I 
also use do power the winder. The pulse from the GPIO pin is accurate to a 
sub-microsecond level. By the time you deal with the solenoid and the 
mechanical issues in the synchronizing arm, it is, let us say, somewhat less 
precise.

On a side note, I have in my possession the book “Selling the True Time: 
Nineteenth-Century Timekeeping in America”, 
.
 Interesting read about railroads driving the need for standard time, as well 
as college and university astronomers setting up a cottage industry of selling 
the time. Western Union, with its telegraph distribution of time from the US 
naval observatory and using the Self Winding Clock Company clocks supplanted 
the local observatories.

Ralph
AB4RS

> On Oct 14, 2015, at 2:02 PM, Brooke Clarke  wrote:
> 
> Hi Nick:
> 
> One of my Self Winding Clock Co. (WU) clocks was taken down yesterday for 
> painting.
> When put up one of the Ken's Clock Synchronizers was installed and the hands 
> moved to align with the heart shaped cam it uses, but it never worked.
> The problem was it used a 4.5 Volt signal which can develop the current 
> needed to pull the sync electromagnet the time constant is far too slow.
> I'm going to add a high voltage circuit with series resistor to get the time 
> constant down one or two orders of magnitude.  The key to this is a PCB I 
> make that holds 5 each 9V batteries connected in series, so I'll use one, two 
> or more of them to get the time constant down.
> http://www.prc68.com/P/45VS.html
> 
> Before I had the 45 Volt Stick I was considering getting the needed high 
> voltage by charging a cap a minute or two before the top of the hour and 
> discharging it through a resistor.  Here's a video showing that would work.
> http://www.prc68.com/I/SWCC.shtml#Experiments_Feb_2014_
> 
> Mail_Attachment --
> Have Fun,
> 
> Brooke Clarke
> http://www.PRC68.com
> http://www.end2partygovernment.com/2012Issues.html
> http://www.prc68.com/I/DietNutrition.html
> Nick Sayer via time-nuts wrote:
>>> On Oct 14, 2015, at 4:42 AM, billriches  wrote:
>>> 
>>> Not milisecond time distribution but time related!
>>> 
>>> In the early half of the 1900s Western Union was in the time business.  They
>>> would rent businesses such as banks, office buildings, etc  clocks for a few
>>> dollars a month.  These were pendulum wall clocks that had 2 #6 dry cell
>>> batteries inside that would wind them every hour or so. The clocks were
>>> connected to the WU telegraph line and for a minute before and after  the
>>> top of the hour all traffic on the circuit would stop.  Exactly at the top
>>> of the hour they would push a pulse of 50 ? volts or so over the line and it
>>> would reset the clock to the top of the hour.
>> The WU standard time service goes back further than the turn of the 20th 
>> century. It started in 1870.
>> 
>> I’ve always wanted to get my hands on one of those clocks and come up with a 
>> circuit to recreate the synchronization signal for it, probably with a 
>> Raspberry Pi running ntpd and a big ol’ MOSFET. The problem is that at this 
>> point, those clocks are quite expensive once they’re reconditioned.
>> 
>> My understanding (perhaps incorrect) was that the sync pulse was once daily 
>> and, as you said, would cause the hands to “snap” to 12. The trailing edge 
>> of the pulse was synchronized and would release the clock to operate 
>> normally.
>> 
>> That they had something as accurate and widespread as it was so early is 
>> astonishing.
>> ___
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>> and follow the instructions there.
>> 
> 
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Re: [time-nuts] How did they distribute time in the old days?

[Tom Van Baak]

Nick Sayer writes:
> The WU standard time service goes back further than the turn of the 20th 
> century. It started in 1870.

See also: http://leapsecond.com/history/usno.htm

> I’ve always wanted to get my hands on one of those clocks and come up with a 
> circuit to recreate
> the synchronization signal for it, probably with a Raspberry Pi running ntpd 
> and a big ol’ MOSFET.
> The problem is that at this point, those clocks are quite expensive once 
> they’re reconditioned.

You will find lots of these auto-setting self-winding clocks on eBay. Some are 
very reasonably priced.

There's a bunch of clock guys out there who play with these and you'll find 
circuits and information with a google search for words like self-winding clock 
company or SWCC or Western Union USNO and so on. Start with:

https://en.wikipedia.org/wiki/Self_Winding_Clock_Company
http://www.telechron.com/swcc/swcc.html
http://www.kensclockclinic.com/pdf/PoweringSWC.pdf
http://community.nawcc.org/chapter52/pages/selfwindingclockco

Mitch's (www.telechron.com) and Ken's (www.kensclockclinic.com) sites are 
superb.
 
Also, for a screen full of irresistible SWCC photos, try this:
https://www.google.com/search?tbm=isch=self-winding+clock+company

> My understanding (perhaps incorrect) was that the sync pulse was once daily 
> and, as you said,
> would cause the hands to “snap” to 12. The trailing edge of the pulse was 
> synchronized and would
> release the clock to operate normally.
>
> That they had something as accurate and widespread as it was so early is 
> astonishing.

Oh, Padawan, that's just the tip of the iceberg when it comes to the deep and 
fascinating history of precise timekeeping.

/tvb
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Re: [time-nuts] How did they distribute time in the old days?

[Brooke Clarke]

Hi Don:

I've got a number of SWCC clocks and 3V doesn't work for any of them.  I've done a number of experiments and a higher 
voltage and series resistor makes a huge improvement.



Mail_Attachment --
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Don Couch wrote:

Hi, Brooke,

My self winding clock synchronizes fine on three volts. I built a synchronizer using a PIC controller with a 32KHz 
quartz crystal, running on three volts. You might want to carefully check the coil and connections on yours. By the 
way, the winding coils also are running on three volts.


Don Couch

On 10/14/2015 11:02 AM, Brooke Clarke wrote:

Hi Nick:

One of my Self Winding Clock Co. (WU) clocks was taken down yesterday for 
painting.
When put up one of the Ken's Clock Synchronizers was installed and the hands moved to align with the heart shaped cam 
it uses, but it never worked.
The problem was it used a 4.5 Volt signal which can develop the current needed to pull the sync electromagnet the 
time constant is far too slow.
I'm going to add a high voltage circuit with series resistor to get the time constant down one or two orders of 
magnitude.  The key to this is a PCB I make that holds 5 each 9V batteries connected in series, so I'll use one, two 
or more of them to get the time constant down.

http://www.prc68.com/P/45VS.html

Before I had the 45 Volt Stick I was considering getting the needed high voltage by charging a cap a minute or two 
before the top of the hour and discharging it through a resistor.  Here's a video showing that would work.

http://www.prc68.com/I/SWCC.shtml#Experiments_Feb_2014_

Mail_Attachment --
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Nick Sayer via time-nuts wrote:

On Oct 14, 2015, at 4:42 AM, billriches  wrote:

Not milisecond time distribution but time related!

In the early half of the 1900s Western Union was in the time business.  They
would rent businesses such as banks, office buildings, etc clocks for a few
dollars a month.  These were pendulum wall clocks that had 2 #6 dry cell
batteries inside that would wind them every hour or so. The clocks were
connected to the WU telegraph line and for a minute before and after  the
top of the hour all traffic on the circuit would stop. Exactly at the top
of the hour they would push a pulse of 50 ? volts or so over the line and it
would reset the clock to the top of the hour.

The WU standard time service goes back further than the turn of the 20th 
century. It started in 1870.

I’ve always wanted to get my hands on one of those clocks and come up with a circuit to recreate the synchronization 
signal for it, probably with a Raspberry Pi running ntpd and a big ol’ MOSFET. The problem is that at this point, 
those clocks are quite expensive once they’re reconditioned.


My understanding (perhaps incorrect) was that the sync pulse was once daily and, as you said, would cause the hands 
to “snap” to 12. The trailing edge of the pulse was synchronized and would release the clock to operate normally.


That they had something as accurate and widespread as it was so early is 
astonishing.
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[time-nuts] eLORAN will be on the air

[paul swed]

The Wildwood eLoran transmitter will be continuously broadcasting from 0900
(EDT) on 20 October 2015 through 1800 (EDT) on 22 October 2015. Wildwood
will be broadcasting as 8970 Master and Secondary.
Regards
Paul
WB8TSL
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[time-nuts] KS-24361 REF-0 standalone

[Mark Sims]

On the new board,  I would add a header for GPS TXD/RXD/PPS/PWR/GND to make it 
easy to play with different GPS modules...  
   
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