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.
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-nut
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
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 th
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?
___
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),
-
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.
__
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 m
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.
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 th
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 colu
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 th
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 unsubsc
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 equations
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
glitches/tweaks/improve
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 all
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-n
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.
https://www.eevblog.com/forum/testgear/
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
http://lists.febo.com/mailman/listinfo/time-nuts_lists.feb
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
__
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 i
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
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
mod
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 se
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 mai
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 s
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)
h
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 r
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
http://l
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 screen
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?
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 h
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
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. Th
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
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.
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 and
It looks like the OCXOs used on some of the Trueposition GPSDOs (which also
used some Bliley OCXOs).
I really like that it has an internal OCXO available. You don't have to use it
if you have a better reference source handy, but it can be very convenient if
you don't.
BTW, the drift rate on
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@lists.
It would be pretty easy to teach Lady Heather how to do it. Heather already
supports several different audible clock. One issue would be constructing the
message from several snippets. Currently Heather plays sound files
asynchronously and if you start one file before the last one has compl
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 ins
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 a
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 t
Attached is the FA2 noise floor test. The FA2 was clocked by a HP-5071A 10 MHz
output. The FA2 frequency input was the FA2 reference output signal (which
should be the 5071A output, maybe with some buffering distortion). I didn't
have the cables and T-adapter handy to split the 5071A output
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 to
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 modes
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.
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 sp
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
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 t
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 preced
(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 .
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.
> Ca
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 unsubscribe,
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 plotti
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
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
http://lists.febo
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
http://lists.febo.com/mailman/listinfo/
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 ar
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, abou
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 ar
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 re
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 --
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.
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 t
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 awar
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.
https://insidegnss.com/update-galileo-service-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
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
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 navi
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 sawt
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 res).
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.
https://www.febo.com/pipermail/time-nuts/2017-April/10
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 com
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. Obviously
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 ADEV/HDEV/MDEV/TDEV
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 t
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 sp
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 menti
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 receiver
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@lists.febo.c
The 30 dBc refers to the signal level reported by the Ublox. If the Ublox
falls below around 30, the Truetime will be reporting -196 dBW. That seems to
be the cutoff threshold for its idea of a "good" signal... it does not have a
user settable signal level mask My conversion formula work
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
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 ca
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
valu
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).
_
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,
I am in the process of adding Truetime XL (DC and AK) support to Lady Heather.
It looks like I can also support the XLi (does NTP), but the XLi manual has
some vague/conflicting info for the output of these commands:
F18 - version
F72 - faults
F73 - alarms
Does anybody have an XLi and can capt
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@lists.febo.co
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. Belo
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 t
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,
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
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 receive
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
http://lists.febo.c
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 firmwar
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@li
I got in the GPSDO from China. It looks nice, but I have not tried firing it
up yet. I have no other info on this GPSDO. Here is what the seller has
found out. This GPSDO has two 10 MHz SMA connectors and a MMCX (?) antenna
connector. It has a 2007 date etched on a PCB. I suspect some of
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 se
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@l
1 - 100 of 202 matches
Mail list logo