[time-nuts] test message

My email address book got corrupted. Hopefully this will work... ___ time-nuts mailing list -- time-nuts@lists.febo.com -- To unsubscribe send an email to time-nuts-le...@lists.febo.com To unsubscribe, go to and follow the instructions there.

[time-nuts] Grandfather clock sync'd to 1PPS

I also disciplined a friends grandfather clock. I used a small servo to nudge/impulse the pendulum. It used 24 impulses/minute. Worked rather well for a crude hack. No mods were done to the clock case/mechanics. ___ time-nuts mailing list --

[time-nuts] making crystals

I built a 405 nm laser head for my mini-mill. It could cut features with a resolution of around 4 microns. I mainly used it to cut solder paste stencils. A friend used it to expose photolithography masks on quartz plates and silicon wafers. Also to tune some vibrating reed like thingies by

[time-nuts] Ebay Huawei Ublox M8T Modules

Can somebody point me to a connection diagram for the external connections tp the carrier boards? ___ 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

[time-nuts] Voyager space probe question

I once bought a spool of tungsten-rhenium alloy wire on ebay for dirt cheap. A few weeks later a guy contacted me and offered a lot of money for it. Turns out they used it to rebuild TWTs. > I wonder what sort of cathode material they use?

[time-nuts] OCXO housings - Why copper and not iron/steel?

And (if I remember the numbers properly) Isotopically pure diamond has twice the thermal conductivity of natural diamond. There are places that make diamond-like carbon thermal pads. Also places that make actual diamond ones (which are not as expensive as you would think),

[time-nuts] LH and long-term oscillator measurement

There is a command line option (and maybe a direct keyboard command) for setting the plot queue size. Sorry, I'm away from a Heather machine and don't remember what it is. You could also write a log file or receiver raw data stream capture file and extract the data from that.

[time-nuts] ! PPS Source

The Tbolt won't track sats if the DAC is manually set too far off the value needed for 10 MHz. -- > And now your GPS chip won't even boot or work right if the user's 10 MHz isn't there, or isn't accurate enough, or is still warming up, or if the user's 10 MHz has too

[time-nuts] 3D printed tourbillon clock

https://www.youtube.com/watch?v=E9prY3ky6Bo ___ 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] Precise pendulum

https://arstechnica.com/science/2020/06/tiny-pendulum-may-reveal-gravitys-secrets/ ___ 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

[time-nuts] Lady Heather - sort satellites by dBc

You can sort a column either ascending or descending. Specifying which one to use with a click on the column header isn't easy or intuitive. Clicking anywhere on the sat info table zooms the screen to a detailed sat info screen -- >I still think that a "standard" click on

[time-nuts] Lady Heather - sort satellites by dBc

The GC menu has options for sorting by any column. You can chose an ascending or descending sort. ___ 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

[time-nuts] UBlox F9T and Lady Heather

Yes indeed, there is a version that supports the F9T/F9P. Unfortunately the code is currently in a university building that is locked down. No idea when I will get access to it again... ___ time-nuts mailing list -- time-nuts@lists.febo.com To

[time-nuts] Gravity, solid Earth tides

If you are interested in solid earth tides and gravity effects Lady Heather can calculate / display / plot them in real time for your location. BTW, one of the surprisingly large factors in accurately calculating the moon position is the position of Venus. Also, Jupiter gets into the

[time-nuts] OCXO Support Board

One thing that I recommend is that after completing the layout is to: 1) step back and wait a few days 2) enjoy a few adult beverages while waiting 3) go back a re-check everything 4) send it out to the board house You'd be surprised how often simple, subtle, not so subtle

[time-nuts] Quality of timing mode GPS vs survey accuracy

Be aware the some receivers report altitude in MSL (mean sea level) and others use AGL (height above ground level). Depending upon where you are and the conversion model, there can be over 100 meters difference. --- I >if I take a survey > with several GPS receivers will they

[time-nuts] FE-5680A - Newbie capacitor question

If it's a filter cap on the output of an LDO voltage regulator (at 1 uF it is probably not) be aware that a lot of LDO regulators have problems with very low ESR caps. Check the LDO data sheet for acceptable values. ___ time-nuts mailing list --

[time-nuts] power supplies

Yes, Power Designs units are VERY good. Some (their precision models) are insanely good. They have a cult following and can be a bit pricey these days. There are lots of posts on eevblog.com about them. Dave did a video on one of the precision units.

[time-nuts] TICC / TimeLab fun

Lady Heather's TICC parser does not expect alternating ABAB readings and handles the ABAB vs ABBA situation properly. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

[time-nuts] questions about oscilloquartz 10MHz module

I've been using 8663's for years. I've put many of them in freq counters. Their phase noise is fairly good, but not stellar. Their temperature stability is more than excellent. Aging drift tends to be far better than spec. As with all things OCXO, YMMV

[time-nuts] Using HP5071A with dead tube along with GPS

I've actually done this... Lady Heather has built in "alternate disciplining" algorithm for the Thunderbolt. I tricked up some code to use this along with a TAPR-TICC to make a GPSDO. The first (rather crude) hack worked pretty well. I haven't had a chance to do it properly... yet. The

[time-nuts] tracking position & orientation

NRCAN / csrs-ppp will do L1 only data. Typical results have errror ellipses in the 300-500 mm range. It also seems to be the only free site that handles RINEX V3.xx data. They only use GPS and GLONASS measurements, -- >I do not know of any free sites that will post process “L1

[time-nuts] Antique pendulum clocks

Whenever Dollar Tree those solar cell powered "nodding" figurines on sale (for $1) I pick one up (btw, they haven't had any for several months). A friend of mine loaned me his 16 channel 10 ns FPGA based time stamping counter. So, I picked out 16 different nodders (out of 100 or so unique

[time-nuts] Used ESE ES-911/GPS/NTP Master Time Clock

I got my ESE ES-911 to work.The problem that I was seeing was that the unit was not seeing data from the GPS receiver... it would not show a GPS lock, even though the GPS receiver (a Motorola M12+) was working properly.Probing around the ESE motherboard showed the GPS receiver was not

[time-nuts] FA-2 questions

If you have a terminal connected, the FA2 outputs the version info when you switch it on. --- > I'm not sure of a way other than turning it on and quickly reading the screen > to see the firmware rev. Mine is V20190827. ___ time-nuts

[time-nuts] Used ESE ES-911/GPS/NTP Master Time Clock

I got in one of these... alas, the GPS module does not seem to work. It never locks to GPS. Alas, there is no status information to tell what is going on. These units only output a time code (in one of 4 different formats). All configuration is done via DIP switches. They do not output any

[time-nuts] Authoritative Source for Lady Heather

The two real sources are ke5fx.com and EEVBLOG ke5fx.com has the "official" fully blessed release. It is currently at v5.0 This package has the nifty installer program. The EEVBLOG site (https://www.eevblog.com/forum/metrology/lady-heather-v6-beta-for-windows-exe/msg1434005/#msg1434005)

[time-nuts] can of worms: time-of-day in a community radio station

Well, Lady Heather will do all that (plus handle time zones, DST, and leapseconds). A Ras PI (even a Pi Zero) works very well. I have just added a "radio station studio clock" display mode. This clock display is driven by the system clock which is hopefully steered by NTP. Default update

[time-nuts] FA2 internal OCXO orientation sensitivity

It's not due to thermal issues. The freq change due to tip is way too fast for that. --- > It’s also possible that the sensitivity is due to thermal issues. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

[time-nuts] FA-2 Frequency Counter Display

I doubt that you can find a suitable larger replacement display. Besides interface compatibility issues, a larger display will probably have more pixels than the FA2 firmware expects. I have added FA1/FA2 support to Lady Heather. It includes a command (ZF) to zoom the screen to a full

[time-nuts] FA-2 questions

No, the power switch turns off all power. See my post about the warm up characteristics of the FA2 OCXO: http://lists.febo.com/pipermail/time-nuts_lists.febo.com/2019-October/097803.html --- >First, does the internal OCXO run when the power is turned off?

[time-nuts] Question for my new GPSDO

The BME280 does temperature, humidity, and pressure. They are very nice. Beware of BME280 boards sold on Ebay, etc. A lot of sellers ship BMP280s. One way to tell is the BME280 is in a square package and the BMP280 is more rectangular. Also be aware that some BMP/BME280 libraries seem to

[time-nuts] FA2 internal OCXO orientation sensitivity

The first time that I tried to set the FA2 internal oscillator frequency I tilted the case so that the screen was facing down and the adjustment screw was facing up. I got it on frequency, but when I placed the unit with the bottom of the case facing down the oscillator was 0.032 Hz off. So I

[time-nuts] FA2 internal OCXO warm-up time

I did a test of the FA2 internal OCXO warm up time. I powered mine down for 4 fours and then powered it up and measured the frequency as it warmed up. It looks like it takes 45 minutes to stabilize. Note that it took a week of constant power for the oscillator drift rate to settle down.

[time-nuts] FA2 Programming

The command $Cxx* will set the contrast. xx can be 00 to 63. Ignore the measurement data that the FA2 sends continuously and just type over it (or disconnect the input signal). It should respond with something like CONTCOK if the command is accepted. Note that the value is stored in EEPROM

[time-nuts] FA2

The "official" 7" PI touchsrceen (800x480) sells for $60 at MicroCenter. Lady Heather has a built in touch keyboard or you can use the PI's touch keyboard routine. But touchscreen keyboards can be a pain to use for a lot of typing. Heather lets you attach script files to the function keys.

[time-nuts] FA2

Maybe try running Lady Heather on a Raspberry PI? My PI config is a PI with their "official" 800x480 touchscreen all mounted in a SmartiPI case/stand. Heather can collect data from the FA2 and echo it to a file all while displaying the data and calculating and plotting ADEV/HDEV/MDEV/TDEV

[time-nuts] FA-2 Counter Questions

Can you post a copy of the manual? Nobody that I've talked to has seen any manual or documentation.We've assumed that the "P" means the PLL is locked and the '*' indicates the unit has an input signal. ___ time-nuts mailing list --

[time-nuts] FA2 low pass filter

A user on EEVBLOG asked his FA2 seller about the low pass filter. It is apparently 150 kHz. ___ 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

[time-nuts] FA2 internal reference oscillator test

This morning the drift rate is down to 0.001 Hz/day. It's settling in faster than expected. --- > The oscillator drifted at the rate of 0.00635 Hz / day, but the drift rate > is slowing down (it's now around 0.005 Hz / day). It will be interesting to > see how it

[time-nuts] FA2 internal reference oscillator test

I did a test of the FA2 internal OCXO oscillator. The FA2 uses this as the reference if you don't connect an external reference. You can adjust the oscillator frequency with a small pot on the back panel. As shipped the oscillator was 0.10 Hz off. I adjusted to be within 0.003 Hz (I didn't

[time-nuts] FA2 counter

A list member did some experimenting with the unit and came up with this very useful information: "press and hold RST button, then MODE toggles LPF (low pass filter), GATE toggles input impedance" I wonder what the LPF cutoff freq is? I am currently doing a noise floor test (connect ref out

[time-nuts] FA2 counter

Miy FA2 came in today. A very quick test shows that it works. It does not appear to have the -0.0002 Hz freq measurement bias that the FA1 has. The 0.1 second gate time mode is pretty useless... there appears to be a 300 msec dead time between measurements in 0.1 (and 10 sec) gate time

[time-nuts] The effect of centrifugal force on a \n hourglass

https://www.youtube.com/watch?v=7cLjFAADM44 ___ 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] Capturing NMEA and TICC timestamp data in time-correlated way?

Lady Heather does measurements on the arrival time of message vs the time encoded in the time message being used and compensates the time code for the offset. It uses a default value that depends upon the receiver type or can use a user specified value. For generic NMEA receivers you should

[time-nuts] Capturing NMEA and TICC timestamp data in time-correlated way?

Lady Heather should do the job. It supports using a GPS device as the main input device and a TICC/counter as an auxiliary input device (/ei= command line option). Writing a .xml format log file will have all the data. On a TICC you should connect chA to the 1PPS signal (and optionally the

[time-nuts] A comparison of the TAPR-TICC and BG7TBL FA1

FA1 noise test was shown here: http://lists.febo.com/pipermail/time-nuts_lists.febo.com/2019-August/097445.html TAPR TICC noise test was shown here: https://www.eevblog.com/forum/metrology/comparing-the-performance-of-17-different-gpsdos/?action=dlattach;attach=591979;image Tom ran my TICC data

[time-nuts] BG7TBL FA1 frequency analyzer

Yes, it should work with Timelab, Stable32, etc. It streams a series of frequency measurements every second out the USB port (it uses a FTDI chip for the USB interface). The data is of the format: " F:0123456789.123456789" (without the quotes) Measurements with a PLL unlock error are

[time-nuts] BG7TBL FA1 frequency analyzer

(Hopefully this is not a duplicate post... hotmail has been having issues) The FA1 is a small, USB powered frequency counter. You supply it with a 10 MHz reference and an input frequency of 1 .. 80 MHz. It outputs a text string of the measured frequency every second. They cost around $80

[time-nuts] GPS Antennas

They work very well. I get the same results as with a $5000 L1/L2 survey antenna. My antenna location is horrible, so there may be some difference with a better location... but I doubt it would be noticeable for most users. I used F9P, F9T, NetRS and Z12 receivers. >

[time-nuts] Trak Systems 8900 manual

I am adding support to Lady Heather for some Trak Systems GPSDOs.I think I have the 8820. 8821, and 9100 covered. Does anybody know where I can find a Trak Systems 8900 manual? ___ time-nuts mailing list -- time-nuts@lists.febo.com To

[time-nuts] TAPR TIC Upgrade?

Well, I've done that... sort of. I'm still using the TAPR TICC, but have it connected to a PI-3B / official PI touch screen mounted in the excellent SmartiPi case running Lady Heather. Heather can configure the TICC and capture TICC data to a file while simultaneously calculating and

[time-nuts] Serial or other simple protocols for exchanging time

I would use the NMEA ZDA message. An (easily fixed) issue with Tom's suggestion is the message does not start with a unique character... that can cause issues with syncing to the message (syncing to the end of the previous message has its own issues). Ideally a time message should start/end

[time-nuts] Is using TAI in Unix/Linux system clocks working in 2019?

Systems that need a leap second free time scale these days seem to be using GPS time instead of TAI. It seems to be rather popular in the financial industry. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

[time-nuts] HP OCXO's 10544A and 10811A

I once bought a groups 8 5370A's.Half had 10811's and half had 10544A's. The 10544A's had lower long term drift than the 10811's. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

[time-nuts] HP5370A vs B version

Once upon a time, I looked into the front ends of the 5370 counters (mostly 5370A) and found that it was practical to build a replacement using modern chips. I then lost interest in the project when I found an Ebay seller with a lot of 10 pieces of the 5370A chip for dirt cheap (sorry, all

[time-nuts] Control and monitor program for Spectracom 8195B

I got in an 8195A and managed to get Heather working with the wonky, very much not computer friendly, Spectracom interface and command set. When you send a command to the device it echoes back the characters. This is very useful for telling what command the device is responding to. But,

[time-nuts] Most popular NMEA sentence with date and time?

The GPRMC sentence is supported on all the GPS modules that I have. The GPZDA sentence is the best time/date sentence to use if your receiver supports it. It just has date/time info and is usually optimized for the best timing performance. Note that for best accuracy you need to adjust the

[time-nuts] HP5370A vs B version

The "B" version uses custom hybrid modules for the inputs... and the CH1 and CH2 hybrids are not the same... so you can't swap a CH1 hybrid with a CH2 hybrid. I think the A and B model counters are fairly equivalent in their sensitivity to input damage. It seems to be a lot harder to find

[time-nuts] Galileo Service Outage Update

Well, they are now saying it was not a timing problem but was caused by bad ephemeris data being broadcast. Processing recorded signals with external ephemeris data yielded proper positions. http://www.navsas.eu/node/611 ___ time-nuts mailing list

[time-nuts] Galileo Service Outage Update

My F9T started tracking Galileo sats at 19:22:10 UTC ___ 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] Control and monitor program for Spectracom 8195B

The problem with the 8195 is that the serial port software interface was designed for human interaction with very little regard paid to supporting a computer monitoring program. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go

[time-nuts] Galileo service currently degraded

Lady Heather is open source and has parsers/decoders for just about any receiver you are likely to see... and a few that your aren't.One big issue with binary protocols is handling big/little endian (byte order) issues when reading messages or sending them to the device. You need to be

[time-nuts] Galileo service currently degraded

A report that the outage is due to a failure at the Galileo "precise time facility" in Italy. It has all their cesiums and a maser. Hmmm... no backup facility... sounds like a recipe for disaster? Service outage may last over 90 hours.

[time-nuts] Galileo service currently degraded

The satellite tracking / health info is sent by the receiver. Heather just reports what the receiver is sending. Oh, and the Galileo system status has changed from "degraded" to "service outage". https://www.gsc-europa.eu/system-status/Constellation-Information What is amazing is that I can

[time-nuts] Galileo service currently degraded

Not this time... Heather flags unhealthy sats in RED. Sats that are visible but not being used for navigation are flagged in YELLOW. Sats that are actively being used are shown in GREEN and are used to draw the satellite count plot line (CYAN line at the bottom of the plot area). Typically

[time-nuts] Galileo service currently degraded

It seems to more than a little "degradation". My F9T is seeing and tracking Galileo sats, but is not using the results for navigation... Lady Heather shows all Galileo sats in yellow. Selecting Galileo only, the receiver reports it is attempting to acquire satellites and not producing a

[time-nuts] Advantages of GNSS ???

A big issue with using the sawtooth correction message from a GPS receivers is the issue of just what that sawtooth value is related to and how to apply it to the measured PPS value / phase. I added the ability to Lady Heather to calculate a sawtooth corrected "paper clock" by applying the

[time-nuts] A Research Proposal

The message that the TrueTime/Symmetricom FTM-III power line monitor card for the XL/XLi receivers contains: A time error (number of accumulated seconds of error based upon the line frequency) The current frequency error from nominal 50/60 Hz The current measured line frequency (0.001 Hz

[time-nuts] Switching 1 pps signal

When I first got my TAPR-TICC one of the first tests that I did with it was to put a coil of RG-58 in the freezer then measured the prop delay as it warmed up. I posted a plot on the list. I didn't have a temp sensor in the coil, though.

[time-nuts] 60Khz received on Wide-band WebSDR

The SD keyboard command in the latest versions of Lady Heather will give you the distance and bearing from your antenna to a specified location along with an estimate of the prop delay and number of ionospheric hops. You can specify the location either as lat/lon or the station name... the

[time-nuts] Advantages of GNSS ???

Here is screen grab of an F9T tracking GPS/GLONASS/GALILEO/BEIDOU. In the max sig level display the sats that the F9T says do L2 ionospheric corrections are shown in GREEN. Note that the F9T thinks that it is seeing signals from PRNs 192..202 These are the Japanese QZSS sat PRNs.

[time-nuts] 60 Hz frequency and phase measurement

Attached is a plot of line frequency measurements made by the FTM-III card in a Truetime XL-DC. The FTM-III is meant for measuring line frequency in generating stations, etc. It has a 0.001 Hz resolution. This plot shows a 3 hour window of data, histogram of the data, and

[time-nuts] 60 Hz frequency and phase measurement

There are numerous devices out there that do non-contact detection of AC voltage in wiring. The wire just has to be live and not connected to a load. Fluke sells a nice one, but I like the GVD-505A from GB instruments because it had a pot to adjust the sensitivity. It has a power switch on

[time-nuts] 60 Hz frequency and phase measurement

In order to add Truetime XL-DC (and XLi support) to Lady Heather, I bought an XL-DC that happened to have the FTM-III module in it. This module is designed to measure power line frequency for generating stations, etc, It works well, but the minimum integration time is one second. You can

[time-nuts] accurate time on your pi, the extreme way design

In case you missed the announcement a new Pi 4 has been released. Available in 1GB/2GB/4GB versions with true 1 gbit ethernet and two of the USB ports are USB3. Also two HDMI ports. The CPU clock is 1,5 GHz and the new CPU cores are 2-4 times faster than the current ones. Also, I saw

[time-nuts] Z3801A going into Holdover

A few months ago, my 3801A started doing this. It was tracking sats well (several years ago I had to replace the receiver because it had lots of problems acquiring and tracking sats).I swapped in a replacement 10811 OCXO and that fixed the problem. Apparently the problem with the

[time-nuts] Looking for a HP-58503 display

Nope, I never found a replacement display... still looking. I think the displays showing up on Ebay for various HP equipment are Chinese clones. They even have displays for the 3458A multimenters. ___ time-nuts mailing list --

[time-nuts] Truetime XLi sat signal levels (dBW to dBc/SNR conversion question)

I have figured out an empirical formula for mapping between the TrueTime dBW values and the more traditionally reported signal level values. I ran a Ublox F9T and the TrueTime in parallel off the same antenna. By comparing the TrueTime and Ublox sig levels a rather trivial mapping function

[time-nuts] TICC reference source

If you are using the TICC to measure the time interval between two signals then the reference clock does not need to be all that good (the gooder the better, though). But if you are using the TICC to measure one or two independent sources, then your reference clock should be as good as you

[time-nuts] Truetime XLi sat signal levels (dBW to dBc/SNR conversion question)

I am adding Truetime XL and XLi support to Lady Heather. Pretty much all GPS receivers report sig levels in dBc or SNR type values in the range of around 20 .. 50. The Truetime XLi reports them in dBW with a range of around -196 to -145 dBW). Does anybody know how to convert the dBW

[time-nuts] GPS 1PPS, phase lock vs frequency lock, design

How often Lady Heather gets a satellite position report depends upon the receiver type. It can range from every second to once per minute. - > (there seems to be some finite latency in LH's constellation reports, but I'm > not sure how much -- perhaps Mark will comment).

[time-nuts] Bombe clock

Everbody needs one of these... https://www.ebay.co.uk/itm/The-Covert-Bombe-Clock-from-Bad-Dog-Designs-Codebreaking-in-Secret/123775434764 https://www.youtube.com/watch?v=O4ctUqgj7aY ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe,

[time-nuts] Rooftop antenna and splitter

Also, some receivers do a survey every time you power them up. --- > If you move the antennas “far enough” (how far very much depends on the design) the device goes back into survey mode. ___ time-nuts mailing list --

[time-nuts] OCXO Question

100 hours is not nearly enough time for the OCXO to stabilize... you need more like 1000+ hours. Here is results of measurements when I put an 8663 into an HP-53132A counter: UTC 8663 mounted on Sweeny DOCXO card in a HP 53132A counter. The 8663 had not been powered up for over 10 years.

[time-nuts] True position unlocking

Unless you have a really crappy antenna setup, I doubt it is a signal level problem. These receivers do like to do the "holdover" thing. No telling if those are real holdovers, though... no documentation. It could be that the device is going into some house-keeping mode... who knows? Also

[time-nuts] GPS week rollover grounds airplanes

Apparently the rollover grounded some airplanes... oops... https://arstechnica.com/information-technology/2019/04/gps-rollover-apparently-cause-of-multiple-flight-delays-groundings/ ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe,

[time-nuts] Navsync CW25 undocumented messages

After upgrading the firmware in my CW25, I took a look at the new firmware .bin file and found what looks like some undocumented / new messages and parameters. I sent it requests for the unknown parameters and got back these strings: $PRTHR,PPSO,0,0,10*51 $PRTHR,MCNO,30*40 $PRTHR,IDNO,00*40

[time-nuts] Navsync CW25 rollover

The Navsync CW25 crapped its pants when rollover occurred. It (and a lot of other Navsync devices) have a known firmware bug where they stop tracking sats if the week number is 0. Sure enough, at zero hour, all the sats disappeared. Conner Winfield has firmware updates for the problem

[time-nuts] Rollover : Thunderbolt

Thunderbolts have a rollover date based upon the firmware build date. That delays the week rollover. They went into rollover mode around May-June of 2017. ___ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to

[time-nuts] Navsync CW25 rollover

I recently got in a Navsync CW25 based receiver and added support for it to Lady Heather. I found some info that says current firmware will be affected by the rollover... in a major way! When the week reaches 0, it stops tracking sats for the whole week. Conner-Winfield has updated

[time-nuts] Lars GPSDO

On a real simple GPSDO that I built, I drove the PWM into a 2N700x fet, pulled the FET output up with the OCXO VREF / resistor, and added a RC filter. Seemed to work rather well. The OCXO VREF was around 7V. ___ time-nuts mailing list --

[time-nuts] GPS week rollover

I doubt that any GPS receivers will be newly affected on April 6. Some very early receivers were hit on the first GPS rollover, but those made since then usually have a 1024 week compensation built in based upon the firmware creation date. Those rollover 1024 weeks from that date and start

[time-nuts] NAVICOM RCGD-M GPSDO

I recently picked up a NAVICOM RCGD-M GPSDO off of Ebay. Does anybody have any info on these? One version seems to have a Furuno GT08031, another seller show Lady Heather monitoring a Motorola 8 channel GPS, ___ time-nuts mailing list --

[time-nuts] F9T ADEV

Was that from the sawtooth corrected or the raw data? It would be very interesting to compare the two values from the same run. And, alas, as we are finding out, the F9T does not seem to accept RTCM corrections from F9P (or other) GPS/NTRIP devices. The F9T seems to use only its own

[time-nuts] inexpensive fiber optic distribution

The "personality" for these modules is stored in a bog standard 3.3V 256 byte I2C EEPROM (address 0xA0). The I2C bus is n the connector. An Arduino can reprogram that memory. For the simplest case you just change the vendor ID info. I think the kilobuck level programmers is just a simple

[time-nuts] Frequency Ensemble

Lady Heather can output RINEX (v2.xx and 3.xx files) for most receivers that output pseudorange and/or carrier phase data. I have tested it with the Ublox 4T, 5T, 6T, 8T, F9P, and F9T receivers. Also the Venus RTK receivers, Trimble NetRS, Ashtech Z12,, NVS08, Trimble timing receivers, and

[time-nuts] LMU300 Connectors

The standard config for telecom equipment that runs on +24V or -48V is that they have an isolated input DC-DC converter in them. The input voltage goes through a full bridge rectifier that makes them insensitive to input voltage polarity. On the ones that I have played with they worked fine

[time-nuts] Power supply for OCXO using "USB power blocks"

Usually they are very noisy, with the noise rising rapidly with load current. goughlui.com, lygte-info.dk, and a few others have published some tests. I think bigclive has also done some tests. -- > How quiet is the output from those USB battery things..I've used one to run a

[time-nuts] Lady Heather treats me badly.

Try starting with the /rxk command line option to force Lucent KSx mode. Depending upon which side you are connected to you may also have to use /br=baud_rate to force the baud rate. One side runs at the default 19200 baud, the other runs at 9600 baud. If you got the source .zip file

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