Re: [time-nuts] Sidereal seconds

Forty years ago I made a sidereal rate generator that inserted 128 pulse for every 46751 counted (solar frequency) pulses. The ratio of 46879/46751 is an accurate sidereal rate, good to 1 second in about 650 years. I used some CD4029 presettable counters to count down from 46751 and used two

Re: [time-nuts] telling time without a clock

The star catalog specifically designed for lunar occultations is the XZ (I'm guessing it stands for eXtended Zodiacal) Catalog from the US Naval Observatory. It's based on the earlier ZC and covers the band of brighter stars that can be occulted by the moon. Simbad should have these catalogs.

Re: [time-nuts] Another Trimble Thunderbolt-like GPS?

I think the PCB cut off at ebay # 300628220912 is an image artifact. If you look carefully you'll see the cut extend into the gray area on the right. Fluke-L (it's L, not i) wouldn't foist a sawn-off board to sophisticated buyers. Aart Olsen - Original Message - From: Ed Palmer

Re: [time-nuts] My Racal-Dana 1992

My Racal1994 oscillator is labeled 9462 454879 on one face of the can and 404386C on another. Aart Olsen - Original Message - From: Charles P. Steinmetz charles_steinm...@lavabit.com To: Discussion of precise time and frequency measurement time-nuts@febo.com Sent: Sunday, December

Re: [time-nuts] Fwd: Re: Using a Racal 1992

Didier's site has a manual for the 1995-1996 which shows the OCXO's doubler circuit, if that helps. I think it's the same as in the 1992. http://www.ko4bb.com/Manuals/Racal/RACAL19951996OperationandService.pdf Aart Olsen - Original Message - I think it's been asked, and recently,

Re: [time-nuts] gravity controlled pendulumn clock?

Instead of a GPS disciplined one ton mass, Huygens used a second clock on his mantel. The very slight acceleration that each pendulum exerted on the mantel caused the other clock to displace slightly, so its escapement triggered either earlier or later, and finally the clocks became

Re: [time-nuts] OT: At the Flea

On CSPAN's Book TV yesterday the President of Dow Chemical stated that their *starting* salary for newly graduated chemical engineers is now $120K. That $10 chemistry set might have been a good investment. Aart Olsen - Original Message - From: Tom Holmes thol...@woh.rr.com To:

Re: [time-nuts] Thunderbolt setup

I'll vouch for the Thunderbolt Standard Easy Kit from Fluke.L (Bob Mokia) on ebay. The one I bought a month ago contained a new-in-a-box Tbolt (manufactured in 2004, with the Trimble OXCO and the higher resolution DS1620 thermometer (read the Time Nuts archives about the Tbolt variants);