Re: [time-nuts] HP E1938 oscillator

In a message dated 5/25/2007 17:31:00 Pacific Daylight Time, [EMAIL PROTECTED] writes: I still have dozens of surplus E1938A's if anyone wants one. They are in worked the last time it was turned on, but no guarantee of specs condition. I can't accept money for these units. Rick

[time-nuts] Manuals

Hello Brian, my name is Harry. I have read your page [time-nuts] Manuals date:Sun Feb EST 2005 there are two manuals of Tracor model 599K VLF/LF tracking receiver in your list. Fortunatly, I have get this receiver in ebay but without manuals. Me question, have you still a manual and waht is the

[time-nuts] C-Max filed Chapter 11

For anyone with interest in C-Max's Time Receiver products, my Sales Rep. for C-Max forwarded this message from their boss yesterday: C-Max filed Chapter 11. Do not sell any longer!! Their old site: http://www.c-maxgroup.com/home/index.php refers to a new site: http://c-max-time.com Both

Re: [time-nuts] FMT

Well, I was too late sending my results, but I did manage to listen to the signals this past Wednesday. I did not have time to prepare anything but listening by ear on the FT-1000 and using the HP-3586A as a beat generator (free running off it's internal Ovenair precision OCXO), I managed to

Re: [time-nuts] Pendulums Atomic Clocks Gravity

Hi, I think that on a satellite orbiting around the Earth, only the gravitational field of the Earth is zeroed, since it is equivalent to a freefall in the Earth gravitational field. The effects of all others perturbations are exactly the same (if you neglect the altitude of the satellite with

Re: [time-nuts] Pendulums Atomic Clocks Gravity

I recently acquired at an estate sale a compact 10 MHz 27Vdc Austron Inc., Sulzer model 1630 crystal oscillator, but I cannot find any data via the web on how to hook it up. It has a ring of nine solder terminals on the base. Does anyone in this group have any information? John WA4WDL

Re: [time-nuts] Pendulums Atomic Clocks Gravity

Then a pendulum calculator at: http://www.ajdesigner.com/phppendulum/simple_pendulum_equation_period.php allows solving any of 8 pendulum related equations. Note that this simplistic l/g formula does not characterize the period of precision pendulum clocks, as it ignores factors such as

Re: [time-nuts] HP E1938 oscillator

I still have dozens of surplus E1938A's if anyone wants one. They are in worked the last time it was turned on, but no guarantee of specs condition. I can't accept money for these units. Rick Karlquist N6RK E1938A circuit designer Due to the high level of interest, I may need to limit

Re: [time-nuts] Pendulums Atomic Clocks Gravity

On Sat, 26 May 2007 13:34:24 -0700, Brooke Clarke wrote: Hi Bill: It's my understanding that a satellite is in free fall, hence zero g. 'Free fall' implies that g is not zero! If g=0 was true, then the satellite would not be falling at all. It is beacuse g is not zero, that the satellite is

Re: [time-nuts] HP E1938 oscillator

I am attempting to compile what information I have and get it archived on line somewhere. Can you give me a pointer to the stuff on TVB's site so I make sure I am not reinventing the wheel? Google for E1938A, what else ;-) http://www.leapsecond.com/museum/e1938a/ I still have dozens of

Re: [time-nuts] Pendulums Atomic Clocks Gravity

From: Bill Beam [EMAIL PROTECTED] Subject: Re: [time-nuts] Pendulums Atomic Clocks Gravity Date: Sat, 26 May 2007 13:06:10 -0800 Message-ID: [EMAIL PROTECTED] On Sat, 26 May 2007 13:34:24 -0700, Brooke Clarke wrote: Hi Bill: It's my understanding that a satellite is in free fall, hence

Re: [time-nuts] HP E1938 oscillator

I have a lot more info available that what is on this site. I will be gathering it up... Rick -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of Tom Van Baak Sent: Saturday, May 26, 2007 2:14 PM To: Discussion of precise time and frequency measurement

Re: [time-nuts] Pendulums Atomic Clocks Gravity

Hi Tom: I get it. It's really g that matters and not the force (F = m * g). Have Fun, Brooke Clarke http://www.PRC68.com http://www.precisionclock.com Tom Van Baak wrote: Then a pendulum calculator at: http://www.ajdesigner.com/phppendulum/simple_pendulum_equation_period.php allows solving

Re: [time-nuts] Pendulums Atomic Clocks Gravity

At 01:17 PM 5/26/2007, Brooke Clarke wrote... Just starting to adjust the bob on a pendulum clock... Tom has pointed out that the stability limit on pendulum clocks is in the area of 1E-7 because of the complex effect of the Sun and Moon on the value of g. I'd think it would be significantly

Re: [time-nuts] HP E1938 oscillator

In message [EMAIL PROTECTED], Richard \(Ric k\) Karlquist writes: Regarding non-USA requestors: I will need to look into the customs aspect of this. If anyone on the list can give me a tutorial on this it would be helpful. These are gifts if that matters for customs purposes. Also, they have

Re: [time-nuts] Pendulums Atomic Clocks Gravity

From: Poul-Henning Kamp [EMAIL PROTECTED] Subject: Re: [time-nuts] Pendulums Atomic Clocks Gravity Date: Sat, 26 May 2007 22:22:54 + Message-ID: [EMAIL PROTECTED] In message [EMAIL PROTECTED], Neville Michie wri tes: These points are good for satelites as the orbit never decays.

Re: [time-nuts] HP E1938 oscillator

Rick, Do you accept PayPal? Or let me have your address so I can send you a check. Two would be really nice, for comparison, but if it is one--it is one. Thanks, Had, K7MLR Due to the high level of interest, I may need to limit the oscillators to one per person. I will be getting the

Re: [time-nuts] Pendulums Atomic Clocks Gravity

In message: [EMAIL PROTECTED] Bill Beam [EMAIL PROTECTED] writes: : 'Free fall' implies that g is not zero! : : If g=0 was true, then the satellite would not be falling at all. : It is beacuse g is not zero, that the satellite is in 'orbit' rather : than moving off in a straight line.

[time-nuts] Measuring clocks watches

I ran across an interesting place devoted to the measurement of clock and watch performance. http://www.bmumford.com/mset/access/access.html Colin You snooze, you lose. Get messages ASAP with AutoCheck

Re: [time-nuts] Pendulums Atomic Clocks Gravity

Hi Mike: Back in the 1800s clock makers found ways to temperature compensate the pendulum such as putting a Mercury thermometer at the bottom, using metals with dissimilar expansion coefficients (Harrison used steel and bronze (no zinc then)) or materials with almost zero COE like Invar. The

Re: [time-nuts] Pendulums Atomic Clocks Gravity

Brooke Clarke wrote: Hi Mike: Back in the 1800s clock makers found ways to temperature compensate the pendulum such as putting a Mercury thermometer at the bottom, using metals with dissimilar expansion coefficients (Harrison used steel and bronze (no zinc then)) or materials with

Re: [time-nuts] HP E1938 oscillator

Hello Rick, same here, two would be great for comparison. I can also paypal you, pick it up locally (Silicon Valley) or send you a check. Please let us know, thanks, Said ** See what's free at http://www.aol.com.

Re: [time-nuts] HP E1938 oscillator

In a message dated 5/26/2007 15:20:44 Pacific Daylight Time, [EMAIL PROTECTED] writes: Richard (Rick) Karlquist wrote: Regarding non-USA requestors: I will need to look into the customs aspect of this. If anyone on the list can give me a tutorial on this it would be helpful. These

Re: [time-nuts] HP E1938 oscillator

Rick, If any are available I would like one. I could pay through PayPal or send you a money order, whichever you prefer. Thanks, Jeff Shank WA3GWB - Original Message - From: Richard (Rick) Karlquist [EMAIL PROTECTED] To: Discussion of precise time and frequency measurement

Re: [time-nuts] Pendulums Atomic Clocks Gravity

At 07:49 PM 5/26/2007, Brooke Clarke wrote... Back in the 1800s clock makers found ways to temperature compensate the pendulum such as putting a Mercury thermometer at the bottom, using metals with dissimilar expansion coefficients (Harrison used steel and bronze (no zinc then)) or materials

Re: [time-nuts] HP E1938 oscillator

As others have said, just let us know where to send the money! :) Any other neat stuff you have laying around that you want to get rid of? *grin* Jason Due to the high level of interest, I may need to limit the oscillators to one per person. I will be getting the oscillators out of storage

Re: [time-nuts] Pendulums Atomic Clocks Gravity

Tom Van Baak wrote: Depends on what you mean by real clocks. The best pendulum clocks, made in the early 1900's, solved almost all the normal sources of error and instability. That left gravitational tides as the one of the few remaining sources of error, down well below the 1 ppm level. I say

Re: [time-nuts] Pendulums Atomic Clocks Gravity

Hi Bruce: Yes, I saw a mention of that. Sort of like crystal frequency jumps. Have Fun, Brooke Clarke http://www.PRC68.com http://www.precisionclock.com Dr Bruce Griffiths wrote: Brooke Clarke wrote: Hi Mike: Back in the 1800s clock makers found ways to temperature compensate the

Re: [time-nuts] HP E1938 oscillator

Hi, Rick. If you have any left, I would like one. Please let me know how you want paid (cash, money order, paypal, ...) Don Couch 3336 E. Oraibi Drive Phoenix, Arizona 85050 [EMAIL PROTECTED] Richard (Rick) Karlquist [EMAIL PROTECTED] wrote: I still have dozens of surplus

Re: [time-nuts] Pendulums Atomic Clocks Gravity

Hi Mike: Yes, it has an invar rod pendulum. I haven't taken it apart but expect there are compensating metals being used. I've heard a well tuned version of this clock lost 15 seconds in 70 days. But in use the USNO supplied a synchronizing pulse on the hour so they really only needed to

Re: [time-nuts] Pendulums Atomic Clocks Gravity

Hi Tom: Rawlings book has a third edition by a number of members of the British Horological Institute that has some added material including a very limited treatment of Allan plots. I sure would like so see more Allan plots, for example that demonstrate the counter limiting the measurement.

Re: [time-nuts] Pendulums Atomic Clocks Gravity

As far as I can tell the Russian Fedchenko observatory clock was the ultimate. About 2 milliseconds per day. Yes, word on the street is that the Russian Fedchenko did even better than Western pendulum clocks by Shortt, Riefler, and Leroy. Possibly because it well-addressed the issue of

Re: [time-nuts] Pendulums Atomic Clocks Gravity

Even fused silica is unstable (see attachment). Single crystal materials should be significantly better. Ageing Invar doesn't do much for its dimensional instability. Bruce Nice plot. Thanks Bruce. Where'd you find it? Someday I want to visit your library! You are just amazing. Yes, I

Re: [time-nuts] FMT

Hi Didier, Good to hear from you. Sounds like you did fine considering how bad condx were that night. I will send out an email on the time and frequency. I think it will be Thursday night this week, but not sure yet. Thanks for participating and have a good weekend 73 Connie K5CM

[time-nuts] Quantity of HP E1938 oscillators = ~37

I made a preliminary count of the oscillators on hand and it looks like 37 are available. There are possibly more the 37 requests, so I may have to draw lots or something to determine who to send them too. I will probably wait until after the holiday weekend when I get back to the bay area.

Re: [time-nuts] Pendulums Atomic Clocks Gravity

Tom Van Baak wrote: Even fused silica is unstable (see attachment). Single crystal materials should be significantly better. Ageing Invar doesn't do much for its dimensional instability. Bruce Tom Nice plot. Thanks Bruce. Where'd you find it? Someday I want to visit your library!