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 special
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 I2
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 a
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 a
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 RT
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 fr
Sparkfun's listing for their F9P board says that they are out of stock but are
going to build 120 more. I wonder if they have the F9P modules in house or
were going to buy them from Digikey?
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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 set
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 ver
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.
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 "a
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.
Ther
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. Th
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 of
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
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 y
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 go
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 ell
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.
https://www.ebay.com/itm/CORS-RTK-GNSS-Survey-Antenna-high-gain-measurement-GNSS-GPS-GLONASS-BDS/253786590956?ssPageName=STRK%3AMEBIDX%
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
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
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 comparison
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 probabl
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
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 macO
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 s
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
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 main
While on the subject of the accuracy/reliability of various algorithms and web
pages showing various astronomical data, we had a full moon / total lunar
eclipse in the northern hemisphere. And not just any full moon, but a Super
Blood Werewolf Zombie Apocalypse full moon (or some such drivel sp
> 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.
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 t
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 but
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.
---
>For hobby stuff, that's good enough! ;)
Heretic! Burn him! Your time-nut card has been revoked! ;-)
Lady Heather supports the Ublox receivers and can set the time pulse outputs,
etc. See the "P" keyboard menu. If Heather does not see the UBX-TP5 message,
the options for configuring the
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. Heath
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, ch
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 Sam
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 i
Lady Heather has a TICC tuning feature (&a 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..
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 TICC
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
c
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.
__
My 5065A has the Patek clock. Those suckers are LOUD. You can hear them
ticking two counties away... hence mine is always disabled. Once started, you
have to power cycle the machine to get it to shut up.
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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.
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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?
__
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
Tom is currently working his magic on the raw data captures with Timelab. The
results so far are looking very good and much more informative.
I'm thinking about doing a rubidium comparison next...
---
> I think the way of presenting it makes it somewhat hard to get an
overview.
_
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 oscil
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/
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There is something seriously wrong with your antenna/cable... With an M8T and
GPS/GLO/GAL I typically track 20-28 satellites. With a crappy indoor antenna I
can track 10-15 sats.
--
> With GPS, GLO & GAL, the M8T-10 was averaging 4 satellites, max 9, min
0, regularly below 2,
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, ca
I have just completed a comparison test of 17 different GPSDOs (I hope to get
the results posted soon). All the UCCM receivers (Trimble / Symmetricom /
Samsung) that I tested were among the best performers. ADEVs at 10,000 seconds
were in the low E-13 range. Maybe your Trimble has issues.
--
If anybody that did the HEOL receiver upgrade still has the old ACE-III
receiver., I'd like to get my hands on one. Lady Heather has code to talk to
the ACE-III, but I don't have one to verify that it works. Heather does work
with the SV6 which is closely related.
___
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.
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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.
__
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 to
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 t
How long had the osc been powered up since taking it out of storage? It can
take an OCXO typically 4-6 weeks of constant power-on after long-term storage
before the drift settles down.
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https://ifixit.org/blog/11986/iphones-are-allergic-to-helium/
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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.
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Lady Heather has an "alternative discipling" routine that "manually" controls
the DAC to discipline the oscillator. It was developed with the help of Warren
Sarkison. It's performance can exceed the Thunderbolt's native disciplining
algorithm.
-
>Yes, the phase difference, of
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 (&a) 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 T
I did some measurements on the Trimble using a TAPR TICC. The "PPS" adevs are
the Trimble and the "OSC" adevs are an Oscilloquartz STAR-4.
http://www.eevblog.com/forum/projects/a-look-at-my-symmetricom-gpsdo-(ocxo-furuno-receiver)/msg1143960/#msg1143960
---
>Has anyone on the
The 58503A needs a null-modem pinout serial cable to connect to a PC. The baud
rate defaults to 9600:8:N:1
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and f
Try the !h keyboard command to hard reset it back to factory defaults...
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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.
-
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-nu
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
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
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.
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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
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 $50
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 out
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 th
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-nu
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 pointed
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
re
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.
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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 *
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 p
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 th
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 K
Lady Heather has DST support code in it (in file heathmsc.cpp). It supports
the current standard settings for several areas (US, Europe, Australia, New
Zealand) or you can specify a custom DST rule. The code is around 200 lines
long... some of that is Heather-specific requirements. It can a
Lady Heather v6 has a command (SD) that estimates the propagation delay (and
distance) between your location and a remote station/location. The station
location can be given as lat/lon or the station name. I have seen a couple of
conflicting location values for RBU. I think I'm using the prop
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.
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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, Glonass, Galileo, Beidou. I connected one channel to a Ublox
M8T and enabled GPS, SBAS, Glonass, and Galileo.
Attached is
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
>
A little while back an update to Ublox Ucenter had a mention of a soon (?) to
be released Ublox M9 receiver that supposedly does L1/L2/L5 data. Shortly
afterward, the update was sanitized. If an M9 comes out that will be very
interesting to play with.
https://rtklibexplorer.wordpress.com/20
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 c
https://www.theregister.co.uk/2018/08/02/cablelabs_docsis_time_protocol/
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The Windows .exe for version 6.08 Beta has been posted on EEBLOG:
http://www.eevblog.com/forum/metrology/lady-heather-v6-beta-for-windows-exe/msg1434005/#msg1434005
This adds support for the Spectrum TM4 GPSDO. It also has support for the old
Motorola VPZ (Oncore VP with carrier phase firmware
a from 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
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&rt=nc&_trksid=m570.l1313
They are not nearly as tweakable as the Thunderbo
https://arstechnica.com/gadgets/2018/07/windows-10-will-get-better-at-telling-the-time-with-new-leap-second-support/
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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 suppo
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 fou
I tried to do a test of sending three RINEX files to CSRS-PPP:
1) carrier phase + pseudorange
2) pseudorange only
3) carrier phase only
Oddly, file 3 was rejected as not having any usable observation data. Files 1
and 2 produced identical output. It looks like CSRS-PPP does not process
carrie
I had a 16 hour long / 1 second interval RINEX file produced from a Trimble
Acutime GG receiver and decimated it several ways to compare how the results
changed.
The Acutime GG is pretty much the worst performing device in my collection...
it is L1 pseudorange only, it is a small sealed uni
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 th
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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