Re: [time-nuts] HP5065A environmental sensitivities

>>> I got a slope of 3.86E-14/hPa frequency difference versus pressure. > > Did you also control for temperature ? > > Air pressure, in particular at high relative humidities changes the > thermal properties of air so there is bound to be some cross coupling > were temperature sensitivities appear

Re: [time-nuts] Last Call Group Buy Ublox LEA-6T

Bert wrote: Our first tests are with a 500 ps DS chip because I did have them, but 200 ps will work with a T5 or 6. We are also considering using two Micrel SY 89295UTG in series with 10 ps resolution, but with the limitation of a single frequency GPS receiver and ionosphere delay

[time-nuts] New Product Release - GPSDO Frequency Standard

Hi guys, It's time I got off the dime and did a product release of my GPSDO. My mission in creating this unit was to provide a stable and accurate frequency reference with 10Mhz, 5Mhz, and 1Mhz outputs. It does have a PPS output, but that is directly from the Ublox receiver, and is not

Re: [time-nuts] Last Call Group Buy Ublox LEA-6T

Hi While it may not be the only parameter worth considering: The standard deviation of the delta between adjacent pps outputs goes down to below 500 ps on the LEA-6T when sawtooth is applied. Bob > On May 18, 2016, at 7:23 PM, Charles Steinmetz wrote: > > Bert

Re: [time-nuts] GENIUS by Stephen Hawking (PBS TV), with 5071A cesium clocks

Congratulations Tom, I'm a lurker here and learn something every day. I'm also in Tucson and have spent a lot of time on Mt. Lemmon so that hook is really cool. My recorder is all set. Locally on PBS at 9PM. Wes N7WS On 5/17/2016 7:50 PM, Tom Van Baak wrote: The TV show is tomorrow,

Re: [time-nuts] HP5065A environmental sensitivities

In message , James Flynn writes: >> I got a slope of 3.86E-14/hPa frequency difference versus pressure. Did you also control for temperature ? Air pressure, in particular at high relative humidities changes the thermal properties of air so there

Re: [time-nuts] HP5065A environmental sensitivities

writes: > I also have a weather station at 6 km distance away, which records barometric pressure at time intervals of > 10 minutes. Out from these measurements, I divided > my phase measurements into 10 minute intervals, calculated the 10 min average frequencies and made a >

[time-nuts] HP5065A environmental sensitivities

Nice data Wulf. Once I finish reducing the temp effects I'll post a couple long term AD plots with and without the Barometric pressure compensation and with and without the temperature modifications. Will be interesting to see what kind of difference I get. Cheers, Corby

Re: [time-nuts] Last Call Group Buy Ublox LEA-6T

Attached is a picture of our ublox board that we plan on making available to time-nuts once we have the FE 5680/50 GPSDO under control so it does not wipe out under any circumstances the memory. We will if any one is interested in a board also make the board only available for less than $ 10

Re: [time-nuts] GENIUS by Stephen Hawking (PBS TV), with 5071A cesium clocks

Congratulations, Tom, on a successful experiment. You should feel very proud. I have seen the promotions for the BBC episode and was looking forward to it, but now, ... I am really excited! I continue to learn and be educated from your Time-Nuts site (and you!). I thank you for your

Re: [time-nuts] FS HP 5335A

The parts appear to be there, it just doesn't run. Tom Holmes, N8ZM -Original Message- From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Graham Sent: Tuesday, May 17, 2016 7:48 PM To: time-nuts@febo.com Subject: Re: [time-nuts] FS HP 5335A Does not have the basic

Re: [time-nuts] GENIUS by Stephen Hawking (PBS TV), with 5071A cesium clocks

Hi Tom, Tom Van Baak wrote: > The TV show is tomorrow, Wednesday evening. 8/9 PM, or something like that. > > Here are fresh web pages with background information, photos, and plots: > > http://leapsecond.com/great2016a/ > > http://leapsecond.com/great2016a/photos.htm > > I have no idea how

Re: [time-nuts] FS HP 5335A

Hi Totally disabling the internal reference was a *very* common thing to do on the 5335. It often became a war of switching things back and forth (for various odd reasons). In some factories the ultimate “disable” approach was pretty drastic. Bob > On May 17, 2016, at 10:06 PM, Tom

Re: [time-nuts] HP5065A environmental sensitivities

Hi Wulf, On 05/18/2016 08:57 AM, dg...@gmx.de wrote: This is my first contribution to the Time-Nut list, but I am a follower for several years. I have made 30 days phase difference measurements of an HP5065a versus a modified Thunderbolt GPSDO (got a MV180 oscillator) with a Fluke PM6681, and

Re: [time-nuts] HP5065A environmental sensitivities

HI Very neat !!! Bob > On May 18, 2016, at 2:57 AM, dg...@gmx.de wrote: > > This is my first contribution to the Time-Nut list, but I am a follower for > several years. > I have made 30 days phase difference measurements of an HP5065a versus a > modified Thunderbolt GPSDO (got a MV180

Re: [time-nuts] FS HP 5335A

The HP 5335A born with factory installed option 010 might happen not to have both the regular crystal and the jumper at all. This is the case of one of mine. Antonio I8IOV >Messaggio originale >Da: Tom Holmes >Data: 18/05/2016 4.06 >A: "Discussion of precise time

[time-nuts] Last Call Group Buy Ublox LEA-6T

There is what looks like a decent carrier board for Ublox modules on OSHPARK.COM's shared project library. It has a voltage regulator and RS-232 interface on it... would be nicer if it had a prototype area and swoopty PPS driver, but I'm too lazy to lay out a better one. Three boards will