Re: [time-nuts] HP5071A with bad tube.... can I get one used?

Brooklyn Dodgers here. It has been caesium since I was an undergrad, at which time there were dinosaurs grazing in the quad. On Friday, October 25, 2019, Richard Solomon wrote: > When did the spelling of Cesium > change ? As far back as I can > remember (High School chemistry, > easier

[time-nuts] FA-2 Data Logger details

Yo Bubba Dudes! Thanks to E W Kehren, he sent me the data logger details from Jureg. They are attached below.  If it gets screwed up by yahoo mail, I'll make a PDF. SDData Logger for FA-2   https://www.sparkfun.com/products/13712  SDLogger - Open Hardware Data Logger - Seeed Wiki Ebay:  

Re: [time-nuts] GPSDO+PC as a NTP server

Hi There are a number of GPS errors that turn into “long period” disturbances. A normal OCXO (even a good one) runs with a fast enough loop that they do appear in the output of the GPSDO. One (of many) sources of this sort of error is the 12/24 hour cyclical nature of GPS orbits. Another is

Re: [time-nuts] HP5071A with bad tube.... can I get one used?

When did the spelling of Cesium change ? As far back as I can remember (High School chemistry, easier then, we only had 52 elements), it was spelled Cesium. But then, they are still the San Diego Chargers to me. 73, Dick, W1KSZ On Thu, Oct 24, 2019 at 11:00 PM Tom Knox wrote: > The Latin form

Re: [time-nuts] The TAI zero epoch of 1958

Thanks for the help everyone! Steve's explanation makes sense that until 1972 LORAN was attempting to match UT2. So when LORAN switched to SI seconds in 1972 the offset between LORAN and TAI matched (approximately) the offset between UTC and TAI. Scott On Thu, Oct 24, 2019 at 11:00 PM Steve

Re: [time-nuts] The TAI zero epoch of 1958

On Fri 2019-10-25T05:12:54-0700 jimlux hath writ: > So why was 1958-01-01 chosen as an epoch time for TAI (or is it, really, > maybe TAI defines the time scale, and you use -mm-dd hh:mm:ss.s. > and it's only some other standard that defines what "zero" means when you > want to

[time-nuts] Rubidium cell or lamp rejuvenation. WAS-HP 5065A owners, a question!

There are two separate Rubidium migration problems. The first is Lamp flooding which occurs when too much Rubidium enters the main bulb and plates onto the bulb envelope. (usually after long storage or storage at high temperatures) This mainly in the small telecomm Rubidiums due to design flaws.

[time-nuts] Cold Rubidium?

Does anyone have any experience/first hand knowledge of this Cold Rubidium standard? https://spectradynamics.com/products/crb-clock/ The specs look very good. The mfr claims that, unlike traditional rubidium oscillators, it has no long-term

Re: [time-nuts] HP5071A with bad tube.... can I get one used?

> Well, I started shipping them back to the factory in the 1990’s and > did so a number of times since then. If there was an exemption, the > factory was not aware of it. They were the driver for being sure > it was shipped as hazmat. Each time (knowing what the issues would > be), I

Re: [time-nuts] GPSDO+PC as a NTP server

Hi! Thanks for all the responses. As I wrote, the chip can use only 1 constellation, and I'm not sure it can use Galileo at all, so I'm sticking to GPS only. As I understand it, GPS errors here smooth out anyway while disciplining internal OCXO, so it's not so important to have the best chip

Re: [time-nuts] The TAI zero epoch of 1958

On 10/24/19 3:32 PM, Steve Allen wrote: On Thu 2019-10-24T15:37:38-0400 Scott Stuart hath writ: The context is that someone is going to be communicating timestamps to me in TAI formatted as the number of elapsed seconds since 1958 Jan 1 00:00:00. To make sure that I understand how this is

[time-nuts] WWVB converter

Here is what seems to be a circuit design to allow WWVB clock receivers work with the current signal format. 2012 WWVB Receiver Modification Modification makes homebrew receiver insensitive to WWVB's new biphase-shifted time code. http://www.maxmcarter.com/rubidium/2012_mod/ Donald Resor N6KAW

Re: [time-nuts] HP5071A with bad tube.... can I get one used?

The Latin form “caesium” is the internationally recognized legal spelling. The common form “cesium” may still be found in older Symmetricom user’s manuals and publications. The caesium inside any of the devices is contained in a UN certified stainless steel cylinder. This cylinder meets all of

Re: [time-nuts] The TAI zero epoch of 1958

On Thu 2019-10-24T16:51:53-0700 jimlux hath writ: > I suspect that 1 Jan 1958 was chosen because it was in the middle of the > International Geophysical Year (IGY) - perhaps the promulgators of TAI did > it as part of IGY? No, not really. The original UK atomic time scale "Greenwich Atomic" (GA)