[GreenKeys] Frequency deviations in Continental Europe including impact on electric clocks steered by frequency

Tue Mar 6 11:12:10 EST 2018

Hi

To answer the question about speed: 

With the old style DC governed motors, it was not at all unusual to see 1% or 2% speed
variations. They worked fine. 

If you have 5 bit code with one start bit, a 10% speed variation will put you off by 0.7 bit 
times. If your stop bit is also one bit time (it *could* be longer) you will stay in sync. Distortion
from other sources likely will mess you up before the “run out of stop bit” problem gets you.
How much distortion do you have on your 15 mile copper wire run?  :) ? These days with
a run of 15 feet being “long”, there may not be much distortion in the rest of your system ….

Bob

> On Mar 6, 2018, at 10:33 AM, drlegendre . <drlegendre at gmail.com> wrote:
> 
> "If it worries folk perhaps they should stick with the older models that had DC motors and mechanical governors!"
> 
> Could someone who is familiar with these models let the rest of us know what the acceptable speed deviation is for them? I'd wager it's more than the greatest short term error for the 60Hz mains. 
> 
> On Tue, Mar 6, 2018 at 9:09 AM, Bob kb8tq <kb8tq at n1k.org <mailto:kb8tq at n1k.org>> wrote:
> Hi
> 
> Most schools / factories / train systems, even back in the 1950’s ran on a “master clock”
> system rather than a bunch of independent clocks. The issue was not so much line 
> frequency as a power outage. Going around to a bazillion clocks to re-set them all to the
> correct time cost a lot of money. 
> 
> Back when I was in school (yes school had been invented that far back) the ham radio club
> guys noticed that WWV and the wall clock had an interesting relationship. The wall clock 
> drifted during the day and between 4 and 5 pm went faster (or I suppose slower) to eventually 
> match up with WWV by 5 pm. The largest deviation that I recall seeing was around 30 seconds. 
> 
> Bob
> 
>> On Mar 6, 2018, at 10:01 AM, Nick <creativegardening at hotmail.com <mailto:creativegardening at hotmail.com>> wrote:
>> 
>> I talked to my sister in Hamburg, Germany this morning. Yes, some clock systems are affected but everything else is running smoothly. 
>> 
>> Just wondering how airports, train stations, governments, etc. are handling the situation. Also wondering about high-tech time clocks in large factories and so forth - there is a possibility that the timing problem could reflection on payrolls. Are workers screwed now?
>> 
>> Who knows  !
>> 
>> Nick  -  N0NCQ 
>> i-Telex  212503
>> 
>> 
>> 
>> Sent from my T-Mobile 4G LTE Device
>> 
>> 
>> -------- Original message --------
>> From: Paul Heller <paul0926 at comcast.net <mailto:paul0926 at comcast.net>> 
>> Date: 3/6/18 3:55 AM (GMT-05:00) 
>> To: Greenkeys <greenkeys at mailman.qth.net <mailto:greenkeys at mailman.qth.net>> 
>> Subject: [GreenKeys] Frequency deviations in Continental Europe including impact on electric clocks steered by frequency 
>> 
>> It seems power in Europe is fluctuating. Has anybody’s teletypes in Europe been affected?
>> 
>> https://www.entsoe.eu/news-events/announcements/announcements-archive/Pages/News/Frequency-deviations-in-Continental-Europe-including-impact-on-electric-clocks-steered-by-frequency.aspx <https://www.entsoe.eu/news-events/announcements/announcements-archive/Pages/News/Frequency-deviations-in-Continental-Europe-including-impact-on-electric-clocks-steered-by-frequency.aspx>
>> 
>> 
>> Paul
>> W2TTY
>> 
>> ITTY: HTTP://INTERNET-TTY.NET:8000/ITTY <http://internet-tty.net:8000/ITTY>
>> AUTOSTART: HTTP://INTERNET-TTY.NET:8030/AUTOSTART <http://internet-tty.net:8030/AUTOSTART>
>> EUROPE: HTTP://INTERNET-TTY.NET:8040/EUROPE <http://internet-tty.net:8040/EUROPE>______________________________________________________________
>> GreenKeys mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/greenkeys <http://mailman.qth.net/mailman/listinfo/greenkeys>
>> Help: http://mailman.qth.net/mmfaq.htm <http://mailman.qth.net/mmfaq.htm>
>> Post: mailto:GreenKeys at mailman.qth.net <mailto:GreenKeys at mailman.qth.net>
>> 
>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/ <http://mailman.qth.net/pipermail/greenkeys/>
>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html <http://mailman.qth.net/archive/greenkeys/greenkeys.html>
>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html <http://comcents.com/tty/greenkeyssearch.html>
>> 
>> This list hosted by: http://www.qsl.net <http://www.qsl.net/>
>> Please help support this email list: http://www.qsl.net/donate.html <http://www.qsl.net/donate.html>
> 
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys <http://mailman.qth.net/mailman/listinfo/greenkeys>
> Help: http://mailman.qth.net/mmfaq.htm <http://mailman.qth.net/mmfaq.htm>
> Post: mailto:GreenKeys at mailman.qth.net <mailto:GreenKeys at mailman.qth.net>
> 
> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
> 1998-to-2001 <http://mailman.qth.net/pipermail/greenkeys/1998-to-2001> greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html <http://mailman.qth.net/archive/greenkeys/greenkeys.html>
> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html <http://comcents.com/tty/greenkeyssearch.html>
> 
> This list hosted by: http://www.qsl.net <http://www.qsl.net/>
> Please help support this email list: http://www.qsl.net/donate.html <http://www.qsl.net/donate.html>
> 

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/greenkeys/attachments/20180306/5deed17e/attachment.html>