[time-nuts] Clock project request from IEEE

Lady Heather has a feature designed just for this application. The TS keyboard command (and the /ts? command line options) allow setting the system clock from the time message sent by a GPS receiver (assuming the program has permission to set the clock). This typically gets the system time

[time-nuts] Clock project request from IEEE

I've looked at automatically determining the local time zone offset from UTC a few times... and always considered jumping off a cliff to be a better option. Huge, unreliable, always changing boundary data bases... local anomalies due to political reasons... lotsa really boring testing and

[time-nuts] Venus timing receiver PPS output

I recently add the ability to Lady Heather to monitor a PPS output and apply sawtooth correction sto the measured PPS and log the results. The Venus timing receivers tout a PPS output with +/- 6 nsec PPS jitter and sawtooth corrections. Alas, the PPS output does not appear to meet this claim.

[time-nuts] Correcting measured PPS values with receiver sawtooth correction values

The F9 has a totally new internal architecture / processor, so it's best to make no assumptions about how it works compared to older models. For the LEA-6T the correction strategy is clearly "add previous sawtooth value". That does not work for the F9P. The two candidates for the F9P are

[time-nuts] Correcting measured PPS values with receiver sawtooth correction values

I am adding the ability to Lady Heather to apply receiver sawtooth correction values to measured PPS values... this requires having a receiver that outputs sawtooth values as the main input device and connecting a TICC/counter measuring the receiver PPS output as an auxiliary input device.

[time-nuts] Lucent RFTGm-II-XO / Lucent RFTGm-II-Rb / NT BW50AA

On some GPSDOs (like those made by Trimble that speak TSIP) you can disable disciplining. Doing this usually reduces phase noise on the outputs, but in this mode the frequency will drift over time. A lot of hams normally keep disciplining on and turn it off when they are driving a radio.

[time-nuts] F9T, was Re: Ublox F9P PPS output

Hopefully if Sparkfun does a F9T, they will bring out a pad for TIMEPULSE 2. On the F9P, I have been unable to change the settings for TIMEPULSE2... maybe the F9P does not actually support it even though is is mentioned in the docs. Sparkfun has their SPARKX division that does short runs

[time-nuts] Ublox F9P PPS output

I got in a Ublox F9P multi-band receiver from Sparkfun. Lately I've been testing the 1PPS output. This data is from the F9P tracking GPS and GLONASS L1 and L2. The PPS was measured by a TAPR TICC clocked by an HP-5071A. BTW, processing the raw F9P measurement data with CSRS-PPP produces

[time-nuts] HP Stories: Battery Chargers, and a fading idolization of HP

Back in the late 70's I worked for a mini-computer company. They were a horrendous paper-work factory... spec after needless/useless/virtually identical documentation requirements. I wrote one document where I put all the timings in units of "ffn"... femto-fortnights. It was over three

[time-nuts] Rooftop antenna and splitter

You will need RINEX v3.x format to take advantage of the F9 multi-GNSS data. CSRS-PPP seems to be the only online service that takes v3 data. Also they seem to only handle GPS and GLONASS at the moment. I have an F9P on order, but Fedex seems to be taking their sweet time (says 2 weeks to

[time-nuts] Rooftop antenna and splitter

I don't know if that Chinese multi-band antenna needs a ground plane/pizza pan. My antenna mount tripod has one handy, so I am using it.My first tests were without the pan and I didn't notice any before/after differences but did not do any extensive testing. The CSRS-PPP position error

[time-nuts] Rooftop antenna and splitter

This is the antenna that I am now using. I do have it mounted over an 18" pizza pan... I don't know if that does any good, it seemed to work fine without it.

[time-nuts] Connector help?

Before I got my multi-band splitter/amp I was using a HP-58517A 8 channel unit. It worked reasonably well with GLONASS and BEIDOU L1. GLONASS signal was a bit degraded and you would lose a few satellites. I could even track GPS L2 with an Ashtech Z12, but the L2 carrier phase / pseudorange

[time-nuts] Rooftop antenna and splitter

I'm currently using one of those sub-$100 Chinese multi-band antennas. It works quite well. With a L1/L2 survey grade receiver I get position error ellipses in the 6-10 mm range (amazing considering my horrible antenna/multipath environment). Antenna feed is 50 feet of RG6 coax. It feeds a

[time-nuts] Frequency standard

Most of the UCCM devices don't store the position. They do a survey every time they power on. The Samsung devices also seem to do a survey after extended periods of holdover. Some of the Trimble (or is it Symmetricom) units will save the survey position in EEPROM. I recently did a

[time-nuts] Ublox F9P multi-band GPS receiver

Here is a list of the signals that the M9P can process: GPS L1C/A GPS L2 CL GPS L2 CM Galileo E1 C Galileo E1 B Galileo E5 bI Galileo E5 bQ BeiDou B1I D1 BeiDou B1I D2 BeiDou B2I D1 BeiDou B2I D2 QZSS L1C/A GLONASS L1 OF GLONASS L2 OF With 2 L2 GPS signals available, the lack of GPS L5 is

[time-nuts] Ublox F9P multi-band GPS receiver

All the Ublox timing receivers output carrier phase and pseudorange data, so I suspect the F9T will also. Heather can directly write a RINEX file that can be submitted to CSRS-PPP for a precise (say 100 mm) position using L1 only data. For L1/L2 data you have more online processing options

[time-nuts] TICC question

Heather can run on Windows, macOS, Linux (including the RasPi) and FreeBSD. Check the first post of this thread. There is a link to the X11 version source code (also download the attached heather.txt file that contains the documentation). That .zip file also has a pre-compiled binary for

[time-nuts] TICC question

You can send it a '#' to get back to the config menu. Or use Lady Heather to control it and log data captures. The 'P' keyboard menu has most of the config commands. Heather (and the '#' command won't work with the original firmware release... you may need to upgrade the firmware. Are you

[time-nuts] Ublox F9P multi-band GPS receiver

That looks like the antenna that I am currently using. The were mentioned on the list last year, but the cheap ones quickly disappeared and the price went to $250-$300. The seem to work very well. I get 6-10 mm error ellipses using L1/L2 GPS on a Trimble NetRS. They have no problem with

[time-nuts] GPS satellite orbits (was: Calculating sidereal time)

I also expected that, but when I added the ability of Lady Heather to plot the SNR/az/el/carrier phase/pseudorange of a given satellite, I found that they repeat every 24-ish hours. At 12-ish hours the SNR and time the receiver had usable signal was greatly reduced. >The

[time-nuts] Ublox F9P multi-band GPS receiver

> It is clearly multi-band for GPS. It is unclear from a quick read if it is > multi-band for the other systems. Here's what they say it supports: 184-channel u-blox F9 engine GPS L1C/A L2C, GLO L1OF L2OF, GAL E1B/C E5b, BDS B1I B2I, QZSS L1C/A L2C Here's the link to the Sparkfun device.

[time-nuts] Ublox F9P multi-band GPS receiver

Sparkfun is now selling the Ublox F9P L1/L2 GPS receiver module on a board ($219). The F9P supports GPS/Galileo/Glonass/Beidou and tracks L1/L2 data. It outputs carrier phase data and has survey-in and fixed position support along with RTK support (10 mm accuracy). Looks like the F9P has 1

[time-nuts] Ublox Neo M8T no output on TP2 question, please?

The official RPi touchscreen mounted in a Smartipi case (with the extended back cover) works very well. That's how I have my alarm clock configured. The GPS and a backup battery are mounted in the back cover. I once hacked up a version of Heather that does the singing clock during the day

[time-nuts] Tuning a Thunderbolt

Oooh, very nice, the full monty of tuning goodness!After doing all that you can spend countless hours tweaking things in search of maximum time-nut-goodness... I'm not sure that a 96 hour precision survey is measurably better than 48 hours, but what the heck, might as well go for it.

[time-nuts] Calculating sidereal time

When I was playing with the sidereal time code I found lots of buggy/bogus implementations and also lots of web calculators that were either totally wrong or off by some amount.Same for sunrise/sunset code and equation-of-time code. It's hard to know what code / sites you can trust.

[time-nuts] Calculating sidereal time

Check out the sidereal code in Lady Heather (it's in heathmsc.cpp) and see if anything looks usable. Heather uses double precision floating point for all the time functions. To display sidereal times set the time zone to GMST, GMAT, LMST, or LAST. Also, if you are doing integer arithmetic,

[time-nuts] New Lady Heather Beta release

I have updated first post on the thread on EEVBLOG.COM to version 6.14 Beta. It has the Windows .exe file attached and also a link to download the source code and Linux/MacOS/FreBSD build package. This update includes support for Trimble receivers that speak RT17 (such as the NetRS), the

[time-nuts] Misuse of word "decimate" (was Re: Short term 10MHz source)

Yes, my use of "decimate" was not a good one. I was going to use "round", but the previous discussion sort of implied to me that the least significant data values were just going to be chopped off and not rounded. "Truncate" would have been better, but the word eluded me at the time. Since

[time-nuts] Short term 10MHz source

Lady Heather has a TICC tuning feature ( keyboard command) that sets the channel offset, etc values. You connect a 1PPS input to both channels via matched cables and a "T" adapter. Heather calculates and sets various parameters. And as far as decimating the TICC output values in firmware...

[time-nuts] Short term 10MHz source

Lady Heather also supports the TICC. The TICC can be the main input "receiver" device and/or an auxiliary input device. With two TICCs connected you can process four channels of data. Heather lets you configure the main input device TICC parameters and also has the ability to "tune" the

[time-nuts] Lars Walineus

It is with great sadness that I announce the passing of my friend and fellow time-nut Lars Walenius. Lars was a wonderful person that was always willing to share his knowledge and offer help to anybody that asked. He is probably most famous here for his "Lars GPSDO", a very simple and low

[time-nuts] Atomic Clocks: It is important that they keep good time, Part 1

Lady Heather does have an audible "tick" clock mode. It ticks on the second and beeps on the minute. The ticks and beeps are fairly well synchronized to true time. You can also set the clock name displayed on the analog clock display... Mine is usually set to Patek-Philippe.

[time-nuts] FCC OTA pre-emption and restrictions on GPS antennas [was: Short term 10MHz source]

A friend of mine has his GPS antenna disguised as a bird feeder... ground plane is a pizza pan. Antenna mounted at the top of a clear tube filled with bird food... alas, no holes for the birds to get to the food. ___ time-nuts mailing list --

[time-nuts] More ES100 WWVB Measurements

Lady Heather has DST code. It has rules for USA, Europe, and Australia or the user can specify a local rule. The code is not very complicated, but getting it right (and testing) can be tricky. >Has anybody looked into how much code it takes to implement DST?

[time-nuts] Trimble NetRS PPS output

I recently got in a Trimble NetRS L1/L2/L2C survey grade receiver (Evil Uncle Bob made me do it ;-) ). It consistently gives position error ellipses in the 6mm range after post-processing 24 hours of data. I had high hopes it would have a decent 1PPS output... nope. The PPS output usually

[time-nuts] Comparing the performance of 17 different GPSDOs

I recently completed some comparison tests of the PPS and 10 MHz outputs of 17 different GPSDOs. The tests were done with a TAPR TICC time interval counter running in timestamp mode and the data was acquired and processed with Lady Heather. The TICC was clocked by a HP-5071A cesium beam

[time-nuts] Project GREAT - Galloping Galileo version

Looks like somebody (sort of) duplicated Tom's experiment (and stole the name): https://www.theregister.co.uk/2018/12/07/galileos_magnifico_measurement_1976_redshift_test_updated/ ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go

[time-nuts] Trueposition Antenna Location

Not all the "holdovers" on the Trueposition are due to signal issues. Many seem to be related to it tuning itself up after a power cycle and they improve or go away after a couple of days of running. But your antenna signal level map is rather awful... lots of red. It could be antenna,

[time-nuts] PRS10 case temperature

The case temperature derived from the ADC reading does not match actual measured values. The PRS10 data sheet says it is roughly the temperature midway between the baseplate and lamp temps. ___ time-nuts mailing list -- time-nuts@lists.febo.com To

[time-nuts] PRS10 case temperature

My case temp runs around 70C with the SRS heatsink installed. If you don't have a heatsink (a rather bad idea) it might run 80C. The latest SRS heatsinks don't seem to be as good as the earlier units which had a lot more metal to them... my heatsink is the later model.

[time-nuts] Lady heather on a Raspberry pi

Lady Heather uses the DTR and RTS modem control signals to control the fan. If you are using a USB-Serial converter the code should work as-is. Heather does not have any code specific to a particular type of hardware (such as the PI). If you are using the PI GPIO serial port, you would need

[time-nuts] HP 58503B PSU replacement

I put a $25 50 watt (?) Meanwell in mine and in mine and it works well. The original power supply was made by PowerOne. They are still made...$300-$400 on Digikey and Mouser. My 58503B had a shorted ceramic cap across the input of one of the 15V regulators. The cap was glowing orange with

[time-nuts] Helium and MEMS oscillators don;t mix well

https://ifixit.org/blog/11986/iphones-are-allergic-to-helium/ ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.

[time-nuts] OCXO Board

A SMA connector for EFC input would be nice. Also a footprint for the Oscilloquartz 8663 DOCXO... these are rather nice oscillators. They do have a ref voltage output. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

[time-nuts] TAPR TICC (Cable run time delay)

The fudge value is generally used to compensate for the channel A vs B internal offsets. Lady Heather works with the TICC and has an "autotune" function () that can calculate and set the FUDGE and TIME2 parameters. You feed a 1PPS signal into a "T" adapter and feed the T outputs to the

[time-nuts] Troubleshooting an HP 58503A

The 58503A needs a null-modem pinout serial cable to connect to a PC. The baud rate defaults to 9600:8:N:1 ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and

[time-nuts] One of my Thunderbolts is drifting

Try the !h keyboard command to hard reset it back to factory defaults... ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.

[time-nuts] Samsung GPSDO : Chinese surplus

All the UCCM receivers have a EXT option... but most refer to it as LINK. Heather sets it to GPS on startup. I believe LINK/EXT selects an external PPS/PP2S provided by the base station. I think they normally operate it in GPS mode and switch to EXT if the GPS goes down.

[time-nuts] Samsung GPSDO : Chinese surplus

I had to make several changes to Lady Heather to work with these... you may have an earlier version. How are you connecting the serial port? In the photo, I did not see the row of four holes that is on the Trimble / Symmetricom versions. ___

[time-nuts] Lars GPSDO on EEVblog

Lady Heather now has some partial support for the Lars GPSDO. It does not directly send any commands to the device (I don't have one yet to implement that), but you can use the !u or !t keyboard commands to do that, Heather treats the Lars GPSDO as a time interval counter. You need to start

[time-nuts] Observations on how "Atomic" WWVB clocks set time

The Arcron Zeit clock does. It also has an RS-232 port. Lady Heather supports it (but calls it an Acron Zeit due to some typos in the original docs that I found and since there are maybe two people in the universe that still use them, I haven't had much motivation to fix that). At one

[time-nuts] Lost GPS lock or 1PPS recently?

I read that the latest GPS sats don't even have the ability to implement selective availability... seems a dubious claim to me, though. - > Indeed it might get turned back on again. ___ time-nuts mailing list --

[time-nuts] Samsung GPSDO : Chinese surplus

These are Samsung's version of the "UCCM" series of GPSDOs. Lady Heather now works with them. I had to tweak the code to handle their funky/erratic end-of-line sequences... various versions of CR/LF, LF, LF/CR. Their STATUS screen and some message responses are also a bit different. They

[time-nuts] FTDI UT232R-200 USB to Serial Converter (BARGAIN ALERT)

I just bought a couple of Advantech AIMB-214E mini-ITX 1.86 GHz motherboards from a local surplus store for $25 ea (NIB). They have 6 genuine RS-232 ports (two can be configured for RS-422/485). Alas, the store don't do mail order and are currently out of stock (but the boards are around

[time-nuts] WWVB Signal Generator

If your receiver has it the $GPZDA can be a better message to use. They usually have better seconds resolution and some receivers give them some special love as to when they come out. But, depending upon your code, this may not matter. Also check to see if your chosen time message comes

[time-nuts] PLL/GPSDO/etc learning resources for mere mortals

Besides temperature compensation for holdover conditions you should also include drift compensation for OCXO aging. The Trimble GPSDOs, HP 38xx and 53xxx GPSDOs, and Oscilloquartz Star-4 do this. Oscilliquartz calls it ATDC (Automatic Temperature and Drift Compensation). For many OCXOs

[time-nuts] Lots of Off Topic discussion

Me too... that's why Lady Heather can calculate and plot solid earth tide displacements. Also the vertical offset in gravity due to solar/lunar tidal effects. - >I'd rather read about Earth tides affecting time measurements. ___

[time-nuts] NIST

I recently added a feature to Lady Heather that can output the sun and moon positions to a port. This was for use by solar trackers and moon bounce antennas. It would be easy to modify that code to output the position of a satellite (or all satellites) if you wanted to keep an antenna

[time-nuts] NIST

A GPS receiver that supports SBAS, etc will tell you where the sats are. Some only report to 1 degree, others 0.1 to 0.01 degrees resolution. The beam with of a small dish at GPS freqs is not all that narrow. Using orbital elements or processing the GNSS ephemeris message will give you a

[time-nuts] Effects of Simple GPS jamming on GPSDO's ?

Several GPS receivers have a setting for enabling jamming detection and/or mitigation. The datasheets don't tend to talk about what it does. But, if the receiver supports it (Trimble and Venus devices), Lady Heather can configure it. ___ time-nuts

[time-nuts] NIST

I once bought a pair of low power 315 MHz TX/RX modules and was going to try them in a model rocket + GPS. I tested them with a serial port and they had a range of a couple thousand feet at 1200 BPS. But when the transmitter was connected to the GPS, the GPS lost lock... turns out 315 MHz *

[time-nuts] WWVB Chronverter update progress

The Ublox 7 has two programmable "timepulse" outputs. The default freqs are (I think) 1 PPS and 10 MHz.I don't remember if the Ublox 6 has one or two outputs... also some of the earlier Ublox receivers have limits on the range you can set the output(s) to (like 1 kHz). Lady Heather can

[time-nuts] WWVB Chronverter update progress

Like I mentioned before, get a $10-ish Ublox Neo7 board/antenna off of Ebay, program one of the Ublox pulse output pins for 60 kHz. Add your favorite microprocessor to talk to the Ublox and drive the modulator. The Ublox 60kHz output should be more than accurate and stable enough to do

[time-nuts] WWVB Signal Generator

If I was going to do it I would take a cheap Ublox 7M board (around $10 with antenna), program one of the time pulse outputs for 60 kHz (it divides evenly into 48 Mhz so no jitter), feed the Ublox serial data / 1PPS to an AVR chip (or $2 Arduino Nano clone), and use that to modulate the 60

[time-nuts] TNS-BUF update

Also check your red LEDs. I have some that have a Vf of over 3V. They could be a blue LED/phosphor (not likely, blue -> red conversion is rather inefficient) or two red LEDs in series. ___ time-nuts mailing list -- time-nuts@lists.febo.com To

[time-nuts] Stable32 Input (Multiplier)

Also note that Heather can only get/update the FC value (usually( every two seconds. Occasionally, due to vagaries in the PRS-10 response timing, you can see two consecutive values in the log that are not the same. > 2) Have any of you ever logged the FC values while at the same time taken

[time-nuts] More Galileo satellites available.

Three of the four Galileo satellites launched last December have been activated (passive hydrpren maser clocks) bringing the total number of usable sats to 17. The fourth one is still "under comiisioning" .Four more sats were launched last month... hopefully it won't take them 8 months to

[time-nuts] Spectrum Instruments TM4 GPSDO

the device, I can use that as a starting point. - > If so, they can do either their custum binary protocoll or NMEA. I have been meaning to suggest for Mark Sims that it would be a apreciated addition to Lady Heather to add the binary protocoll. I should have a manual around, if the T

[time-nuts] Alternatives for Thunderbolts

I've been happy with these: https://www.ebay.com/itm/10Mhz-GPSDO-OSCILLOQUARTZ-OSA-OEM-GPS-GPSDO-10MHz-1PPS-STAR-GPS-Clock/262861459973?hash=item3d33c39205%3Ag%3AsbYAAOSwh2xYAjrp&_sacat=0&_nkw=oscilloquartz+gpsdo&_from=R40=nc&_trksid=m570.l1313 They are not nearly as tweakable as the

[time-nuts] Better leapseconds and PTP support for Windows 10

https://arstechnica.com/gadgets/2018/07/windows-10-will-get-better-at-telling-the-time-with-new-leap-second-support/ ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

[time-nuts] Improved CSRS-PPP service coming

I just got an email from CSRS-PPP outlining their upgraded service coming 14 Aug 2018. https://webapp.geod.nrcan.gc.ca/geod/tools-outils/documentation.php The new software supports all GNSS systems and will handle carrier phase observations for L1 only receivers. Currently CSRS-PPP only

[time-nuts] Pseudorange and carrier phase data in L1 only RINEX

The main reason is to reduce the file size. RINEX files can be rather long... depending upon what the receiver reports and the satellite systems in use, a 24 hour long 1 Hz file can be over 40 MB. BTW, you can .zip the file for uploading. CSRS-PPP is the only online service that I have

[time-nuts] Lady Heather V6.0 and RINEX files...

Yes, the altitude error estimates are generally around twice the lat/lon values. I'm currently playing with taking the same 16 hour/1 sec interval data set (from a Trimble Acutime GG receiver) and decimating it to 5/10/30 second intervals and also to 2/4/8/16 hour lengths and seeing how

[time-nuts] Lady Heather V6.0 and RINEX files...

Actually it is that simple. The relevant RINEX commands are in the new "M" (mesurement) keyboard menu. The MW command is used to write the file. MR is used to set the measurement rate (defaiult 1 second). The other commands mostly provide various info that can be added to the RINEX file

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