Re: [time-nuts] Am I the only Time Nut who doesn't wear a watch?
There's a good writeup on accuracy on wikipedia- http://en.wikipedia.org/wiki/COSC includes a handy table comparing mechanical movement and quartz movement requirements. To be considered a chronometer, the daily rate must be within -4 to +6 secs/day. The stability of the rate over time is more important than the actual rate. (Interestingly- any quartz watch or clock I have is much more accurate than my Hamilton Model 21 ship's chronometer!- a video of one of these beauties- http://www.youtube.com/watch?v=We1dLNXiBj0) -- Paul Nelson W5GNF "When I go, I want to go quietly, in my Ames, Iowa sleep, like my grandfather- not Senior Engineer (Retired) screaming, like his passengers." Sauer-Danfoss Company (drhy...@qwest.net) "More hay, Trigger?" ex-Cessna 140 N77149 (sigh) "No thanks, Roy, I'm stuffed." ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] time-nuts Digest, Vol 58, Issue 51
Well, I found some stuff on this clock... from a few handwritten notes I made several years ago, there exist both types; those that have an internal timebase, and those that require an external timebase. The clock that I can put my hands on right now is an A15586; I have a couple more. The timebase is an E13832-P1, and it consists of a TCXO with an output frequency of 983.040 Hz and a couple of chips (CD4013 and CD4020) which output a two-phase square wave signal at 60 Hz to drive the stepper motor inside the clock. Basic wiring is as follows- there are usually two connectors on the clock, one of which matches the connector on the timebase- a 12-pin circular connector, MS27034H12B12PN. The other, larger, connector is for the ARINC bus stuff. I've had all of mine working with that timebase. If your clock has an internal timebase, it should work simply by powering it with 24v on pins 3 and 4. I don't know which ones do and which ones don't- there's a whole bunch of variations. PinClockTime base 15v lightingn/c 25v lightingn/c 3+16to32v ---> +16to32v 4 -16to32v --->-16to32v 5Case gnd > Case gnd 6Ph 1 drive sig in --->Ph 1 drive sig out- capt clock 7Ph 2 drive sig in --->Ph 2 drive sig out- capt clock 8Ph 1 drive sig out- F/O clock 9Ph 2 drive sig out- F/O clock 10 Ph 1 drive sig out- F/E clock 11 Ph 2 drive sig out- F/E clock 12 spare time-nuts-requ...@febo.com wrote: Message: 2 Date: Thu, 21 May 2009 17:50:33 + (GMT) From: Robert Atkinson Subject: Re: [time-nuts] 747 Chronometer To: crus...@ieee.org, Discussion of precise time and frequency measurement Message-ID: <240600.56920...@web27104.mail.ukl.yahoo.com> Content-Type: text/plain; charset=iso-8859-1 Hi Charles, I had a dig, but could only find info on the current clocks that receive time info on an ARINC 429 serial bus, and an earlier hybrid LCD / mechanical model that needs an external 1PPS (I'd like one of those). I've never seen an aircraft clock that needed an external 60Hz signal. Unfortunatly Hayden have been bought up and no longer list instruments. Keep Googling! Robert G8RPI --- On Thu, 21/5/09, Charles Rushing wrote: From: Charles Rushing Subject: [time-nuts] 747 Chronometer To: time-nuts@febo.com Date: Thursday, 21 May, 2009, 7:45 AM Greetings To All, Please accept my apologies in advance if this is off-topic.? I have just acquired an aircraft clock, which I've tentatively identified as coming from a Boeing 747.? It's way cool looking and would make a perfect dust collector in my ham shack if I could only power it up. There is a multi-pin military-style twist-lock connector on the back, but no indication of what the pinout may be.? The unit is identified as: "CLOCK, 3" 24 HOUR GMT ELECTRONIC MFD BY A.W. HAYDON CO. PRODUCTS NO. AMER. PHILIPS CONTROLS CORP. Cheshire, Conn. MFR'S. PT. NO. A15551-P1" I've searched the Net for technical documentation, but could only find the reference to the 747.? Does anyone have any information about these clocks, or can someone point me in the right direction? Many thanks in advance. Chuck WA5MUV -- Paul Nelson W5GNF "When I go, I want to go quietly, in my Ames, Iowa sleep, like my grandfather- not Senior Engineer (Retired) screaming, like his passengers." Sauer-Danfoss Company (drhy...@qwest.net) "More hay, Trigger?" ex-Cessna 140 N77149 (sigh) "No thanks, Roy, I'm stuffed." ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] Haydon aircraft clock
These clocks are generally driven by 24 volts, not AC 400Hz- BUT they almost all have an external time base which provides a two-phase 60Hz signal. I have several of them, and have been able to find one timebase to power em with I have some documentation squirreled away and I'll look it up this weekend. Best, Paul time-nuts-requ...@febo.com wrote: Message: 3 Date: Thu, 21 May 2009 02:51:19 -0500 From: "Bill Hawkins" Subject: Re: [time-nuts] 747 Chronometer To: "'Discussion of precise time and frequency measurement'" Message-ID: <5d174bd204344f32bbf183ee98579...@cyrus> Content-Type: text/plain; charset="us-ascii" Sounds like you need to know more about the instrument power in a 747, perhaps starting with Boeing. You could be needing DC or AC in one or three phases, more likely at 400 Hz. OTOH, the VCR players for movies looked like stock items. The AC generators in aircraft are not likely to have the accuracy of ground-based power distribution, so the clock probably has an internal DC supply and a crystal oscillator. Can you open it up to do any tracing? Have you tried calling A. W. Haydon? They've been around for a while. Bill Hawkins -Original Message- From: Charles Rushing Sent: Thursday, May 21, 2009 1:45 AM Greetings To All, Please accept my apologies in advance if this is off-topic. I have just acquired an aircraft clock, which I've tentatively identified as coming from a Boeing 747. It's way cool looking and would make a perfect dust collector in my ham shack if I could only power it up. There is a multi-pin military-style twist-lock connector on the back, but no indication of what the pinout may be. The unit is identified as: "CLOCK, 3" 24 HOUR GMT ELECTRONIC MFD BY A.W. HAYDON CO. PRODUCTS NO. AMER. PHILIPS CONTROLS CORP. Cheshire, Conn. MFR'S. PT. NO. A15551-P1" I've searched the Net for technical documentation, but could only find the reference to the 747. Does anyone have any information about these clocks, or can someone point me in the right direction? Many thanks in advance. Chuck WA5MUV -- Paul Nelson W5GNF "When I go, I want to go quietly, in my Ames, Iowa sleep, like my grandfather- not Senior Engineer (Retired) screaming, like his passengers." Sauer-Danfoss Company (drhy...@qwest.net) "More hay, Trigger?" ex-Cessna 140 N77149 (sigh) "No thanks, Roy, I'm stuffed." ___ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
Re: [time-nuts] audiophoolery
I lurk in the digest mode- very rarely have anything to offer, but have to say that I've thoroughly enjoyed these forays off into audiophoolery! just amazing how many ways people can be parted from their money. Makes me think I'm in the wrong business- but, truth to tell, I couldn't live with myself if I had written some of the c**p in those sites. John and John- I have had a pair of Klipschorns since 1969. Never been tempted to give em up. But I have to tell you guys about a friend of mine who showed up at my door one saturday last summer to show me what he'd just picked up at a garage sale near Ames that morning you guessed it, a pair of K-horns. Dusty. A bit scarred. But in good shape, nothing blown. For $50. 'Nuff said. [EMAIL PROTECTED] wrote- from John Day and John De Armond: >>I feel yer pain buddy! My real Klipsches didn't survive a fire. >Sad, isn't it. But in those days I had a house with a good size >listening room ( 16m long, about 6m wide) that could handle them. > > Gawd > >I miss those horns. Those proved that excellent speakers make > >everything else in the system relatively unimportant. >And the efficiency! I got turned on to horns by a now sadly departed >friend who had some upright folded horns that could fill his place >with only three or four watts. -- Paul Nelson W5GNF "When I go, I want to go quietly, in my Ames, Iowa sleep, like my grandfather- not Senior Engineerscreaming, like his passengers." Sauer-Danfoss Company ([EMAIL PROTECTED]) "More hay, Trigger?" ex-Cessna 140 N77149 (sigh) "No thanks, Roy, I'm stuffed." ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
Re: [time-nuts] Blackout in Europe and power line frequency jump
Hi folks- I lurk here from time to time, a piker with only one little FE-5650 and a Russian ships' chronometer to my name... oh, a few nixie clocks and a scope clock or so- but I saw this post about the power outage and thought I might contribute this snippet- From the Risks List- http://catless.ncl.ac.uk/Risks/24.46.html Widespread European power failure <"Peter G. Neumann" <[EMAIL PROTECTED]>> /Sun, 5 Nov 2006 13:17:12 PST/ A high-voltage transmission line was shut down over a river to enable a presumably large ship to pass. This is preliminarily being attributed to a propagating outage that affected something like 10,000,000 people in Germany, France, Italy, Austria, Belgium and Spain. [Source: Danna Avsec, Power failure hits Europe, Associated Press, 05 Nov 2006; PGN-ed, TNX to Lauren Weinstein for noting this one.] http://www.wkyc.com/news/news_article.aspx?storyid=58868 Somewhat ironically, my keynote talk at the ACM CCS 06 included discussions on network-propagating outages in power and telephony, how they keep recurring despite efforts to avoid them, and how they might be prevented. [EMAIL PROTECTED] wrote: >Behalf Of Marco IK1ODO >Sent: Monday, November 06, 2006 3:28 PM >To: Discussion of precise time and frequency measurement >Subject: [time-nuts] Blackout in Europe and power line frequency jump > >Saturday evening part of Europe experienced a blackout, caused, it >seems, by a single failure in Northern Germany, then propagated up to >southern Italy. > >A friend that routinely monitors the 0-120Hz ULF/ELF frequency spectrum >captured the power line frequency jump following the fault. >Hre are the links: > > > > From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On > >>Date: Mon, 06 Nov 2006 13:08:40 +0100 >>To: [EMAIL PROTECTED] >>From: Renato Romero <[EMAIL PROTECTED]> >>Subject: Overload in Germany's power network >> >>From BBC web site 06 Nov/06: >>"An overload in Germany's power network triggered outages leaving >>millions without electricity on Saturday night." >> >>Here my ELF monitoring from Cumiana (NW Italy) >> >>http://www.vlf.it/temp/05NOV06-_E.jpg >>Spectrogram by a geophone (up) and electric field (down) >> >>http://www.vlf.it/temp/05NOV06-_H-rdf.jpg >>RDF spectrogram, magnetic component, acquired with two orthogonal >>minimal loop >> >>http://www.vlf.it/temp/fault.jpg >>Details of the fault: power network frequency get down to 49 Hz for >>many minutes, >> >>http://www.vlf.it/temp/fault_timeb.jpg >>Details in the time domain, about 240 mS showed >> >> >>73, de ik1qfk >>Renato Romero >> >> > > >Renato told me that during the frequency jump a faint 50Hz line was >still present. Possibly some part of the network that had detached from >the rest, or is the Russian network not interconnected with the European >Union? > >Marco IK1ODO > > > ==-- Paul Nelson W5GNF "When I go, I want to go quietly, in my Ames, Iowa sleep, like my grandfather- not Senior Engineerscreaming, like his passengers." Sauer-Danfoss Company ([EMAIL PROTECTED]) "More hay, Trigger?" ex-Cessna 140 N77149 (sigh) "No thanks, Roy, I'm stuffed." ___ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
