Re: [time-nuts] Time-nut going England!

Do not neglect a visit to the Clockworks museum. Examples of the most accurate pendulum clocks ever put into production e.g., (LeRoy, Riefler, Shortt-Synchronome and Fedchenko) are among the collection there. Free — and the staff are very friendly and extremely

Re: [time-nuts] TAPR Oncore M12+ kit

Folks, The TAPR GPS Kit documentation has been updated and revised for clarity (I hope). it includes details for purchasing end plates and also dimensions required to fabricate end plates. The TAPR GPS Kit document, and a motherboard schematic for reference, is now available on Synergy's "GPS

Re: [time-nuts] Three-cornered hat on timelab?

On 4/27/17 3:10 PM, Bob Stewart wrote: Hi Jim, said:"Ionosphere is one - if you're near a ionosonde you might be able to get a data set to correlate against. It's not necessarily a "worst at noon, best at midnight" thing - some of the satellites contributing to your fix will be on slant

Re: [time-nuts] Three-cornered hat on timelab?

Hi > On Apr 27, 2017, at 6:10 PM, Bob Stewart wrote: > > Hi Jim, > said:"Ionosphere is one - if you're near a ionosonde you might be able to get > a data set to correlate against. It's not necessarily a "worst at noon, best > at midnight" thing - some of the satellites

[time-nuts] Three-cornered hat on timelab?

One of the main reasons Lady Heather tracks the sun position, calculates solar noon, etc was at the request of some people researching solar effects on the GPS signal and multipath. You can enable logging of the satellite constellation used each second and the sun position (it shows up at sat

[time-nuts] XL microwave model 3401

Hi, I am looking for a service manual for XL Microwave Model 3401 Frequency Counter. Please advise if you have one for sale or one I could dowmload. Bill Reed br...@otelco.net --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

Re: [time-nuts] Three-cornered hat on timelab?

Hi Bob, OK, since we are in a low sunspot cycle, then it would follow that the 100ns movements would be rare.  Also, since I'm at about 29.8 degrees north, with few obstructions or reflectors to cause a problem, that improves what I'm capable of seeing out of what's available.  As to what

Re: [time-nuts] Three-cornered hat on timelab?

Hi Jim, said:"Ionosphere is one - if you're near a ionosonde you might be able to get a data set to correlate against.  It's not necessarily a "worst at noon, best at midnight" thing - some of the satellites contributing to your fix will be on slant paths, so the solar ionization is not

Re: [time-nuts] Three-cornered hat on timelab?

On 4/27/17 12:10 PM, Bob Stewart wrote: Hi Bob, said: "You have roughly 25 ns p-p in the data you show." OK, here's a misunderstanding on my part right off the bat. You see the swing as a p-p value, when I've been looking at it as only +/- 12.5ns from the trendline. said some time ago: "Now

Re: [time-nuts] Three-cornered hat on timelab?

Hi Dig into space weather if you want to get into the details of the why and how often. It’s all out there Google is your friend. Things like sun spot cycles are one of many drivers. The more perturbed the space weather is day to day, the more likely you are to see changes in the GPS.

Re: [time-nuts] Three-cornered hat on timelab?

Hi Bob, said: "You have roughly 25 ns p-p in the data you show." OK, here's a misunderstanding on my part right off the bat.  You see the swing as a p-p value, when I've been looking at it as only +/- 12.5ns from the trendline. said some time ago: "Now toss in the basics of GPS. Depending on

Re: [time-nuts] Three-cornered hat on timelab?

Hi You have roughly 25 ns p-p in the data you show. There are a number of 10 ns “cycles” in the data. Any of this *may* be due to ionosphere. They also could be due to other issues. With ~4.4 days of noisy data, it may be tough to spot a trend. Since the ionosphere is a bit random, there is

Re: [time-nuts] Three-cornered hat on timelab?

Hi Magnus, Try as I might, the weather and the local power company had other ideas about my long term capture.  I'm running everything but the 5370 from a UPS.  I guess I'm going to have to get batteries for my other UPS and run the 5370 from that.  A one second power loss was all it took to

Re: [time-nuts] Time-nut going England!

Hi: A very worthwhile, and often overlooked, museum is located at The Worshipful Company of Clockmakers (1 Throgmorton Avenue, London EC2N 2BY, Telephone: 020 7998 8120). It is not very large, but has some unusual objects including many of the tools that were used in making clocks.

Re: [time-nuts] Time-nut going England!

Seconded. Did both last August and it was great. The amount of restored hardware that's operational is impressive and docents are knowledgeable. If you get to the computing museum, having a chat with whoever is in the Colossus gallery is worth your time. Admission to BP is £17.75 and the

Re: [time-nuts] Frequency counter questions

Hi Single mixer into a computing counter was the way this stuff was done for a *lot* of years. The sort of resolution you needed a fancy counter for back in 1969 is well within the F7 board’s capabilities. What you get for resolution is often less of an issue than the accuracy of the readings.

Re: [time-nuts] Time-nut going England!

Yes, Bletchley is a good day out but be aware the national museum of computing is a separate entity and has its own entry fee. On 27 Apr 2017 12:00 pm, "Dave B via time-nuts" wrote: > On 26/04/17 17:00, time-nuts-requ...@febo.com wrote: > > > Message: 12 > > Date: Wed, 26

[time-nuts] Time-nut going England!

On 26/04/17 17:00, time-nuts-requ...@febo.com wrote: > Message: 12 > Date: Wed, 26 Apr 2017 15:05:52 +0200 > From: Attila Kinali > To: time-nuts@febo.com > Subject: [time-nuts] Time-nut going England! > Message-ID: <20170426150552.93c33e4cbe356663386bb...@kinali.ch> >

Re: [time-nuts] Frequency counter questions

We do it and get at 1 sec 1 E-13 resolution and 1 E-12 accuracy for the work we do. Bert Kehren In a message dated 4/26/2017 3:00:54 P.M. Eastern Daylight Time, alw.k...@gmail.com writes: I am surprised that no one has mentioned the idea of heterodyning a known frequency with the

Re: [time-nuts] Time-nut going England!

Clint Jay wrote: > Greenwich as recommended by others is a must, the science museum is also a > good way to spend a day. Look for the clock and watch gallery in the Science Museum, lots of great devices from the collection of the Worshipful Company of Clockmakers.

Re: [time-nuts] Time-nut going England!

Mike Millen wrote: > > If you can travel to Cambridge ( a short train trip from London ), the the > Corpus Clock is well worth seeing: > > https://en.wikipedia.org/wiki/Corpus_Clock > > https://youtu.be/pHO1JTNPPOU My notes on the Corpus Clock:

Re: [time-nuts] Time-nut going England!

On Wed, Apr 26, 2017 at 8:05 AM, Attila Kinali wrote: Hi I'll be in the UK for three weeks and will have a "free" week between 13th and 20th of May. I will most probably be around the London area and maybe spend a day or two in Southampton. If you can travel to