Hi Mitch, Sounds like you need a bigger dog ! (hi hi)
73....Bill....WB6BNQ MITCHELL JANOFF wrote: > I'm in the process of connecting my Hahl clock to a GPS based standard. I've > tested quite a few ideas for the Hahl clock and I found that what works best > is the small "squeaker" from a dog toy. By compressing the squeaker on the > odd minutes and releasing pressure on the even minutes, the slave clocks > works fine. I'm using a Parallax BS2 stamp microprocessor to read the time > from a small GPS based unit (just a GPS card with power and antenna that I > got from ebay). I use the Parallax to read the time from the GPS card, and > then on even minutes I push the squeaker closed (solenoid) forcing the air > into the slave clock. On even minutes I retract the solenoid releasing the > pressure, which causes the slave to advance another minute and the squeaker > to refill with air. I have everything working except the solenoid (or stepper > motor). I'll post pictures when I have this finished. I also may add two > additonal slaves to this system, and at that point I don't > believe the volume of air produced by the sqeaker will continue to work, so > maybe the samething with some bellows. > > I'm currently using a similar system for synchronizing Self Winding of New > York Western Union clocks. I use both a WWVB based clock (the clock from > UltraLink (www.ULIO.com) and as a backup a GPS based time standard. A > Parallax BS2 reads the time and at 59:57 past every hour, pulses about 20 > clocks in my house. I run the clocks in groups of 3 or 4 (in series) and then > the entire clock system in parallel, so I can pulse all the clocks from a 12v > car battery. The system has worked very well for several years now. The pulse > is 2 seconds in length so the clocks are released at 59:59 past the hour. It > takes about 1 second for the solenoids to completely release. > > Mitch. > kC2MFB > > ________________________________ > From: "[email protected]" <[email protected]> > To: [email protected] > Sent: Thursday, March 5, 2009 7:00:01 AM > Subject: time-nuts Digest, Vol 56, Issue 16 > > Send time-nuts mailing list submissions to > [email protected] > > To subscribe or unsubscribe via the World Wide Web, visit > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > or, via email, send a message with subject or body 'help' to > [email protected] > > You can reach the person managing the list at > [email protected] > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of time-nuts digest..." > > Today's Topics: > > 1. Re: GPS disciplined mechanical clocks (Steve Rooke) > 2. Re: GPS disciplined mechanical clocks (Neville Michie) > 3. Re: GPS antenna installation problem (Dave Brown) > 4. Re: GPS disciplined mechanical clocks (arie schellaars) > > ---------------------------------------------------------------------- > > Message: 1 > Date: Thu, 5 Mar 2009 20:17:14 +1300 > From: Steve Rooke <[email protected]> > Subject: Re: [time-nuts] GPS disciplined mechanical clocks > To: Tom Van Baak <[email protected]>, Discussion of precise time and > frequency measurement <[email protected]> > Message-ID: > <[email protected]> > Content-Type: text/plain; charset=ISO-8859-1 > > 2009/3/5 Tom Van Baak <[email protected]>: > >> In the evolution of timekeepers the SHORTT CLOCK was one of the great > >> milestones. > > ... > >> These clock kept very good time. > >> Cheers, Neville Michie > > > > Yes, stability at 1 day was right around 1e-8 for a Shortt. > > > > Stability (ADEV) of one Shortt pendulum clock: > > http://www.leapsecond.com/museum/shortt/ > > > > For more details on Shortt and ADEV see: > > http://www.leapsecond.com/hsn2006/ch2.pdf > > This is great stuff. Thanks Tom. > > 73, Steve > -- > Steve Rooke - ZL3TUV & G8KVD & JAKDTTNW > Omnium finis imminet > > ------------------------------ > > Message: 2 > Date: Thu, 5 Mar 2009 19:35:34 +1100 > From: Neville Michie <[email protected]> > Subject: Re: [time-nuts] GPS disciplined mechanical clocks > To: Discussion of precise time and frequency measurement > <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed > > Hi Jim, > a "seconds Pendulum" has frequency of 0.5Hz, and so your subwoofer > would need 0.5 hz response if it is going to shake walls. > Being a purist I must point out that at 0.5 Hz the sound energy would > be in the form of pressure which is very weakly coupled to a pendulum. > The only coupling would be buoyancy, and that would need a 1Hz signal > to give two reductions in apparent gravity per cycle. > > Allied to this discussion is the Loomis effect, discovered by the > American millionaire who had three Shortt clocks running in his > basement. > They synchronised unless aligned at 120 degrees to each other. I > wonder weather they were shaking the bedrock, or maybe the gravitational > attraction between the 10 kg pendulums may have synchronised them. > (See "Tuxedo Park" by Jennet Conant) He qualified as the first time nut. > > cheers, Neville Michie > > On 05/03/2009, at 5:22 PM, Jim Palfreyman wrote: > > > So if I set my GPS locked 3325B to 1Hz (sine wave) and put that > > into my M&K > > subwoofer and sat that next to my pendulum clock (with its ~1m long > > Reifler > > pendulum) it should keep perfect time. > > > > Beauty! > > > > > > > > 2009/3/5 Tom Van Baak <[email protected]> > > > >>> mechanical, more of a hybrid, but I don't know how you'd > >>> discipline a > >>> mechanical clock with a system that had to drive in parallel with > >>> the > >> escape > >>> mechanism, the two would fight each other. > >> > >> Eric, > >> > >> Precision pendulum clocks, when mounted near each other, > >> have been known to eventually get into phase lock. So one > >> idea is to add a GPS 1PPS driven bass speaker or solenoid > >> or some sort of thumping contraption. Perhaps eventually the > >> pendulum clock would lock to the vibrations on the the wall. > >> > >> /tvb > >> > >> > >> > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/ > > time-nuts > > and follow the instructions there. > > ------------------------------ > > Message: 3 > Date: Thu, 5 Mar 2009 23:48:14 +1300 > From: "Dave Brown" <[email protected]> > Subject: Re: [time-nuts] GPS antenna installation problem > To: "Discussion of precise time and frequency measurement" > <[email protected]> > Message-ID: <06a701c99d7f$e37828c0$7900a...@athlon1200> > Content-Type: text/plain; format=flowed; charset="iso-8859-1"; > reply-type=original > > For all those out there who don't have your own BPO 36 master clock, > here is a youtube video that shows the detail of the Hipp toggle in > action. The Hipp is the key to these clocks excellent time keeping. > > http://www.youtube.com/watch?v=lmx5iy4qwhI > > Yes I know, the sound track IS horrible! But you can hear most of the > ticks... Not my video, I hasten to add.. > > For more info on the Hipp toggle, just google and all will be > revealed. > > DaveB, NZ > > ----- Original Message ----- > From: "Neville Michie" <[email protected]> > To: "Discussion of precise time and frequency measurement" > <[email protected]> > Sent: Thursday, March 05, 2009 4:05 PM > Subject: Re: [time-nuts] GPS antenna installation problem > > > Another, maybe the original tape, was called 100 Miles per Hour Tape > > and was sold years after fabric > > covered aircraft wings went out of style as it was so universally > > useful. > > As the name suggests it was rated for repair of aircraft fabric to > > be > > used up to speeds of 100 MPH. > > cheers, Neville Michie > > > > PS. I have a type 36 post office clock running and it has a > > synchronising relay that forces the phase > > of the 30 second output pulses to the nearest 2 seconds, by rotating > > the count wheel which has a cardioid cam. > > At a fixed time every day this relay was energised from the central > > site to correct any phase creep in the > > clocks in the regional post offices. I have occasionally thought of > > linking it to a GPS time source. > > cheers, NM > > ------------------------------ > > Message: 4 > Date: Thu, 5 Mar 2009 03:37:21 -0800 (PST) > From: arie schellaars <[email protected]> > Subject: Re: [time-nuts] GPS disciplined mechanical clocks > To: Discussion of precise time and frequency measurement > <[email protected]> > Message-ID: <[email protected]> > Content-Type: text/plain; charset=iso-8859-1 > > Just to put in my twopenny worth; > In the current (March) issue of OZ electronics magazine "Silicon Chip" > is a project to lock a cheap battery operated clock to a GPS derived signal.. > Uses a Jupitor type GPS head unit to receive the Sat"s signals. > Cheers > Arie Schellaars??? VK3DBF > > --- On Thu, 5/3/09, Neville Michie <[email protected]> wrote: > > From: Neville Michie <[email protected]> > Subject: Re: [time-nuts] GPS disciplined mechanical clocks > To: "Discussion of precise time and frequency measurement" > <[email protected]> > Received: Thursday, 5 March, 2009, 8:35 AM > > Hi Jim, > a "seconds Pendulum" has? frequency of 0.5Hz, and so your subwoofer? > would need 0.5 hz response if it is going to shake walls. > Being a purist I must point out that at 0.5 Hz the sound energy would? > be in the form of pressure which is very weakly coupled to a pendulum. > The only coupling would be buoyancy, and that would need a 1Hz signal? > to give two reductions in apparent gravity per cycle. > > Allied to this discussion is the Loomis effect, discovered by the? > American millionaire who had three Shortt clocks running in his? > basement. > They synchronised unless aligned at 120 degrees to each other. I? > wonder weather they were shaking the bedrock, or maybe the gravitational > attraction between the 10 kg pendulums may have synchronised them.? > (See "Tuxedo Park" by Jennet Conant) He qualified as the first time nut. > > cheers, Neville Michie > > On 05/03/2009, at 5:22 PM, Jim Palfreyman wrote: > > > So if I set my GPS locked 3325B to 1Hz (sine wave) and put that? > > into my M&K > > subwoofer and sat that next to my pendulum clock (with its ~1m long? > > Reifler > > pendulum) it should keep perfect time. > > > > Beauty! > > > > > > > > 2009/3/5 Tom Van Baak <[email protected]> > > > >>> mechanical, more of a hybrid, but I don't know how you'd? > >>> discipline a > >>> mechanical clock with a system that had to drive in parallel with? > >>> the > >> escape > >>> mechanism, the two would fight each other. > >> > >> Eric, > >> > >> Precision pendulum clocks, when mounted near each other, > >> have been known to eventually get into phase lock. So one > >> idea is to add a GPS 1PPS driven bass speaker or solenoid > >> or some sort of thumping contraption. Perhaps eventually the > >> pendulum clock would lock to the vibrations on the the wall. > >> > >> /tvb > >> > >> > >> > >> _______________________________________________ > >> time-nuts mailing list -- [email protected] > >> To unsubscribe, go to > >> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > >> and follow the instructions there. > >> > > _______________________________________________ > > time-nuts mailing list -- [email protected] > > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/ > > time-nuts > > and follow the instructions there. > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > Stay connected to the people that matter most with a smarter inbox. > Take a look http://au.docs.yahoo.com/mail/smarterinbox > > ------------------------------ > > _______________________________________________ > time-nuts mailing list > [email protected] > https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > > End of time-nuts Digest, Vol 56, Issue 16 > ***************************************** > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
