Re: [time-nuts] 1PPS for the beginner

On Mon, August 13, 2018 9:16 pm, Chris Burford wrote: > I have a (generic?) GPSDO which contains an Oscilloquartz STAR 4+ OCXO > that I am using to steer a PRS10 RFS. I'm a little confused on where the > 1PPS is coming from with respect to the GPSDO. A GPS disciplined oscillator contains a GPS

[time-nuts] 1PPS for the beginner

Hello members, At the risk of personal embarrassment and perhaps a chuckle, or two, I'm going to ask the following questions about 1PPS. I have a (generic?) GPSDO which contains an Oscilloquartz STAR 4+ OCXO that I am using to steer a PRS10 RFS. I'm a little confused on where the 1PPS is

Re: [time-nuts] EFOS2 Maser acting up :(

Corby, What's the H flow rate control doing when the IF level goes down, or increases, depending? Prior to retirement, I was the "Keeper of The Clock" at my job, which entailed riding herd on our Symmetricom H-Maser (among other things). At one point about five years ago, the IF amplitude began

Re: [time-nuts] NIST

WRT my sextant comment, How many pilots or sailors can navigate by ‘shooting the sun/stars’. They have become dependent on precision navigation systems. Which of course feeds the thinking by empty suits why do we need lighthouses, buoys, VOR’s and airway beacons because we have the ‘god

Re: [time-nuts] EFOS2 Maser acting up :(

Corby, Nice detective work. Keep us posted. I had a case some years ago where my IF level was sputtering around. It turned out to be the dissociator. It was a pretty easy fix after a fax / email or two from Russia. If you suspect the L.O. you can always free-run it for a week and see if

[time-nuts] solar flares and time references Re: NIST

On 8/13/18 6:52 AM, Peter Laws wrote: As for solar flares taking out the various GNSSs ... wouldn't a solar flare only take out the vehicles that were on the "sunny" side of the Earth? Wouldn't the (approximately) half of the SVs that are in the Earth's shadow be unaffected? Serious

Re: [time-nuts] Loss of NIST transmitters at Colorado and Hawaii

This has ‘empty suit’ written all over it ,’move it to the $BUZZWORD Yes the LORAN shutdown was more impactful from a time transfer PoV but the NIST transmitters provide a crude backup and valuable scientific data with a long baseline In NH we’ve had an unusually severe summer WRT weather

Re: [time-nuts] NIST

On 8/13/18 6:10 AM, Bob kb8tq wrote: Hi Ok, this is Time Nuts. We probably have a pretty good sample of those who use this and that as a source of time. We also are reasonably conscious about what we are doing. NIST’s claimed reason for running WWV (and WWVH) is to distribute accurate time

Re: [time-nuts] NIST

I'll just add: I got into time nuts after I acquired a GPSDO for checking the frequency accuracy of my amateur radios. I realized I needed a GPSDO when I couldn't figure out if I was seeing drift in my radios frequency standards or Doppler shift from WWV transmissions while using WWV as a

Re: [time-nuts] Loss of NIST transmitters at Colorado and Hawaii

I used to live in Miami and now 80 miles north in homes made of steel  reinforced concrete blocks. Junghans considered Miami worse case in the US and came there before introduction of their wrist watch with antenna in the arm band.. The Junghans clocks have worked flawless since then with

Re: [time-nuts] NIST

Hi Ok, this is Time Nuts. We probably have a pretty good sample of those who use this and that as a source of time. We also are reasonably conscious about what we are doing. NIST’s claimed reason for running WWV (and WWVH) is to distribute accurate time and frequency. Would / does anybody on

Re: [time-nuts] Bicentennial GOES satellite clock

On 8/12/18 6:36 PM, David I. Emery wrote: On Sun, Aug 12, 2018 at 07:48:52PM -0400, Bob kb8tq wrote: Hi Well???. there???s also the solar flare that vaporizes the planet earth :) A flare big enough to take out all the sat systems would disrupt a lot more than just navigation. But

Re: [time-nuts] Loss of NIST transmitters at Colorado and Hawaii

On 8/12/18 4:05 PM, Bill Hawkins wrote: Group, This subject needs some additional detail. I found an article with comments at https://swling.com/blog/2018/08/nist-fy2019-budget-includes-request-to-shutdown-wwv-and-wwvh/ It is not clear whether WWVB will still be available for all of our

[time-nuts] About the recent NIST thread(s)

What a weekend. Just a reminder -- our "low volume, high SNR" time-nuts list works best when postings are technical and well-informed. Quite a few of the many NIST-related postings since Friday fell below that threshold. Undoubtedly an accurate story will come out soon. If you know something

Re: [time-nuts] NIST

Hello to the group. The Chronverter is now available again. US $37. Its from unusual electronics as was mentioned earlier in the thread. No matter how 2019 actually goes its a good way to keep the wwvb clocks going. Saves me from having to create the same thing. Regards Paul WB8TSL On Mon, Aug

Re: [time-nuts] NIST

On 8/12/18 8:40 AM, Craig Kirkpatrick wrote: I agree with Bob that shutting down WWVB would not go over well with the voters but losing WWV and WWVH will mainly be noticed only by HAMs. WWV/WWVH also provides HF propagation forecasts, severe weather warnings for mariners, etc., as well as

Re: [time-nuts] Loss of NIST transmitters at Colorado and Hawaii

While consumer WWVB clocks are widespread today, almost all (or all) professional clock displays have shifted to NTP over copper or over sometimes WIFI in the past decade. WWVB or WWV, without an external antenna, was never a good choice for a clock in a steel building to begin with. 30 years

Re: [time-nuts] NIST

Hi > On Aug 13, 2018, at 7:24 AM, Dana Whitlow wrote: > > Note to all; > > Be cautious about getting time of day from consumer GPS products. All that > I have encountered > (so far) exhibit T.O.D. errors up to a few tenths of a second, and the > error is not repeatable from > session to

Re: [time-nuts] NIST

Note to all; Be cautious about getting time of day from consumer GPS products. All that I have encountered (so far) exhibit T.O.D. errors up to a few tenths of a second, and the error is not repeatable from session to session. Some do have PPS outputs, which are typically claimed to provide

Re: [time-nuts] NIST

I'm trying hard to think of routine users of WWV / WWVH other than amateur radio operators, time nuts, and the occasional academic / scientific study that uses the transmitters as a signal source. Perhaps some boaters still use the time signals to set their chronometers, but WWV /WWVH

Re: [time-nuts] NIST

> Le 13 août 2018 à 11:09, Dana Whitlow a écrit : > > Craig, > > The original main reason for WWVB had nothing to do with syncing our > "atomic" > wristwatches and clocks. It was for keeping local frequency standards > honest, for > which continuous coverage throughout the day and night was

Re: [time-nuts] NIST

Craig, The original main reason for WWVB had nothing to do with syncing our "atomic" wristwatches and clocks. It was for keeping local frequency standards honest, for which continuous coverage throughout the day and night was desirable (if not always achievable). But for that application, a

Re: [time-nuts] NIST

From: Craig Kirkpatrick I do like the idea of a GPS to WWVB timecode radio transmitter. I think that would sell well to folks on the fringe of coverage for WWVB such as Florida, Hawaii, and Alaska or other parts of the globe. I’ve found the real limitation to reception of WWVB is local

Re: [time-nuts] Loss of NIST transmitters at Colorado and Hawaii

And don't forget 25 MHz  they put that back on the air a year or so ago... Crazy idea!  I own multiple frequency references, time servers, et al. instrumentation and I STILL use WWV all the time to verify that my radios and clocks are IN FACT close to perfect. 73,

Re: [time-nuts] Bicentennial GOES satellite clock

A good sextant with a good operator can measure apparent altitude to 0.1 minutes of arc. The fastest apparent motion of objects in the sky due to rotation of the earth is 0.25 minutes of arc per second. So the best a sextant can do with time (assuming accurate astronomical tables and an exact

Re: [time-nuts] Loss of NIST transmitters at Colorado and Hawaii

With the time keeping capability of GPS, isn't WWV obsolete ?? 73, Dick, W1KSZ Sent from Outlook From: time-nuts on behalf of Bill Hawkins Sent: Sunday, August 12, 2018 4:05:57 PM To: time-nuts@lists.febo.com Subject: [time-nuts]

Re: [time-nuts] GNSS sky view

Plot code and carrier phase residues alongside that. Cheers, Magnus On 08/12/2018 06:30 AM, Mark Sims wrote: > In preparation for CSRS-PPP's upcoming upgrade to their precise positioning > service I recently got in a new 8 channel GNSS antenna amplifier/splitter > that does GPS L1/L2,

Re: [time-nuts] NIST

WWV HF transmissions include a 100 Hz subcarrier that gives the info in cw format. For generating WWVB code I would suggest simply counting seconds to yield days -- the WWVB code takes the day number in the year. Leap year is easy. Just look up the DST start and stop. acb

Re: [time-nuts] NIST

I hope that defunding is just a ploy and things will remain on the air. I am concerned this is starting to sound like 2010 when DHS/USCG took eLoran off the air in the states. This was one of the few things that totally dismayed me about the Obama administration. On Sun, Aug 12, 2018 at 2:59 PM

Re: [time-nuts] NIST

I agree with Bob that shutting down WWVB would not go over well with the voters but losing WWV and WWVH will mainly be noticed only by HAMs. Dana, I’m puzzled by what you wrote. I have 8 clocks and 2 wristwatches that sync with WWVB. When band conditions are poor they miss a sync for a day

Re: [time-nuts] NIST

I wonder if this will also have any effect on Time Service for Computers, Personal and Commercial. A lot of MS Windows products check for the correct time using time servers access from the internet. I'm sure this will also affect outdoor clock towers which also use this reference. Am I