Hey Guys, sorry I've been MIA for a while. Things happened, moved 500+
miles, etc, etc...
I haven't had some of my time servers on in years, including my TS-2100.
Yesterday I was running some Ethernet cable in my house and also mounted a
GPS antenna up in the attic.
Fired up a few time servers,
Actually, I just looked at Hoptroff's website and guess what? Merry
Christmas!
http://www.hoptroff.com/collections/atomic-timepieces/products/no-16
Some time ago Hoptroff produced a Cs pocket watch
using the Symmetricom SA45s - now how long for a wrist watch !!
The oscillator is most certainly disciplined by the GPS. You can dig
through the telnet menus on the TS2100 for more detailed statistics and
settings (be careful).
I uploaded all the manuals, data sheet, and latest firmware that I have
for you. You can find it at:
I also have a pair of small boards that I don't have any info on.
PCB says Trimble, 39818-00-C. The 00 is written in by hand.
There is a big chip on the bottom that says Trimble. 144 quad
flatpack.
It's got more stuff on the chip, but I can't read it.
I compared against my Trimble
I have purchased about a dozen of these receivers
(mostly the RS-232 version for $1 more). Reyax
ships very fast. I get them in about 1 week.
They work well, and are based upon the Ublox MAX-7C.
They output independent GPS and Glonass NMEA messages
and don't appear to merge the two
The GPS Health menu choice never really did anything. It will always
say Doing position fixes, error code: 1. However, the GPS Firmware and
Signal Strength menus should report back proper information.
Can you elaborate on it does not set the right time? Is it some random
time, or is it off by
Are you sure your GPS module has the correct settings of 9600 8-O-1 TSIP
IN TSIP OUT?
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I am needing a GPS source of precise time, in three flavours - 10MHz
(or
so), 1PPS, and ethernet NTP. In the beginning, the NTP will be most
important, and as time goes on, I'll need the 1PPS signal.
I know DIY is always lots of fun, but if you want to get up and running
quick with little to
What commands were you trying to send that you got gps engine busy???
IIRC, some of the commands never got implemented. I'll fire one of mine
up today and experiment with it to see what kind of output I get when
it's not tracking anything and such.
If the clone receiver is crazy expensive,
There are old TrueTime NTS-100 IRIG units that pop up on ebay from time to
time. However they usually require an AUI to UTP adapter.
Also they only serve Version-3 of NTP... (which some clients you have to
explicitly set that in the server line).
There are also the Datum/Bancomm/Symmetricom
I remember a few discussions over the last few years about building a
microcontroller (PIC, Arduino, MPS430, whatever floats your boat) based
IRIG generator. Did anyone ever get one working?
There is a C source code file in the NTP distribution to generate IRIG via a
sound card IIRC... That
Ernie,
I got a couple of those off eBay too, they've been sitting on my desk for the
past week or so. I'll experiment with them today to
figure out the pinout and post my results.
Sometimes the Trimble manuals get their pinouts upside down. Also the itrax
doesn't appear to have any
Ernie,
I'm having issues right now, I need to find my adapter cable as the one I have
right now is the wrong pin spacing. I did trace the
lines on the PCB and it appears to be the same as the Resolution-T / Lassen /
other Trimble pinouts...
Just FYI, I couldn't find a valid link to the 3.41
My question is this: Under what conditions can the
1 PPS signal be relied on to meet its period uncertainty
spec? The UT+ emits 1 PPS regardless of whether
satellites are visible or not
Look under the TRAIM settings. You should have several choices:
1PPS disabled
1PPS always on
1PPS when
Does anyone have experience with the Synergy SSR-6Tr
and the fairly recent Lotus based M12M.
Thomas,
I've also recently discovered that Furuno makes a GPS module that is M12
compatible (size, power, communication)...
The advantage of the newest model (GT-8736) is it has GPS + SBAS + GLONASS
Just got this board from a Chinese ebayer,
but unable to find any document about the
pin-assignment.
One of the ebay sellers had some PDF links, but also said it is the same pinout
as a Trimble Resolution T.
It seems to fit the same shape and header location... But be cautious...
If you
Unfortunately they use way too much power - 800mW maximum compared to
50mW for a UBLOX MAX-7c which are around $15. It also is specified at
50ns rms, 99% 100ns. It appears that most, if not all, the timing
type modules are higher power as well as more expensive; unless anyone
has any
I can now see that a conversion between the dip and PLCC would be do-able
but as mentioned earlier nasty.
Don't they make socket converters? I would think that would be the easiest way
to go assuming the pinouts would be correct.
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yes normally plcc to dip but not the other way around. (cause who would
ever need that) That said the plcc and dip pin out is not a straight 1 for
1 and that makes things a bit messy. That would not stop me from doing it
though. That is making a frankenstein adapter.
As the subject says, does anyone know what the battery part # is for the
Motorola Oncore M12+T ???
My GPS module has the socket, just missing the battery.
Thanks...
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Chris,
You will have to do a little google searching, or even contact MTI directly,
but the suffixes in the part #'s can mean anything and
without the correct spec sheet you have no idea what the EFC range is, or even
the direction. There is no rhyme or reason to the
suffix numbers (that I can
Laszlo,
Have you tried choosing between your different available clock sources and
letting NTP run for a few days and log the stats?
Check: /sys/devices/system/clocksource/clocksource0/
available_clocksource current_clocksource
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If you search mouser.com for part# M50-3120545
That's what I use...
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I have a few of these old PC-104 x86 boards:
http://www.diamondsystems.com/products/prometheusEAL
They have a 100MHz ZFx86 low power processor with built-in Ethernet MAC and
Phy, 32MB of RAM and 2MB of flash and they can run Linux.
I was wondering if anyone had run NTP on a system like this.
2.2 Is a good working firmware. Unfortunately there is no user-updatable
process, you would have to send it in to a reseller, like
Synergy-Systems for them to flash it, which will probably end up costing more
than what you paid for the receivers.
From what I recall a while back, both 3.0 3.1
NTP is best used over the Internet. It was designed for unreliable data links.
In the quest for expansion of NTP over the internet, one thing has always
nagged me.
You can find lists of servers and they will give a physical location along with
other info about them...
Big whoop... Often
Short Answer (Long Answer is in the PDF):
http://www.febo.com/pages/wwvb_psk/WWVB%20d-psk-r%2003302013.pdf
What/Who is d-PSKer?
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I would do a traceroute and see if the path is the same going to both servers,
that can eliminate some variables.
Beyond that it would take some detective work on their side. It could be the
hardware for each machine is different. Different poll
lengths. Different server loads. Different NTP
I've decided I finally want to tackle learning how to use a PIC chip for some
smaller projects. Can someone recommend me a good (and
cheap) PIC, and possible some literature (be it a book or website)? I have a
fairly recent willem eprom programmer that I'm hoping I
can use.
I don't know what
My reasoning for using a PIC (or similar) is mostly two factors.
First, simplicity... The few things I have in my head that I've wanted to do
aren't complicated or require special busses. It is
things that you could *probably* do with a whole pile of logic chips, or keep
it simple with just one
I have an older Endrun Technologies Praecis Gntp (GPS) time server. Basically
it's a small SBC coupled together with a special board
made by Endrun (I think really it's just their Praecis Ce Time Frequency
Engine) and a Trimble GPS module.
It ran fine for years, then one day it stopped
Yes, there is a free program that can poll all your windows machines on a
network.
http://www.greyware.com/software/domaintime/instructions/tools/lmcheck.asp
Jason
I wonder if anyone has suggestions as to how to check the timing variations
between two PCs that are running windows.
The
Usually the Trimble manual for whatever module you are using has pretty good
documentation of all the commands. I would assume
something like TSIPchat or TSIPmon would allow you to program and save settings
(the only thing I have saved is COM port settings,
but I'm sure there are others).
As
I'm sure some of you noticed the flood of Tymserve 2100's on eBay lately, they
were selling in lots of 3-4 (or more)! I managed to
pick up a few (like I really needed them) and proceeded to add in the GPS
module to make them a little more useful.
I haven't seen any Trimble ACE receivers on eBay
The other day I got sidetracked and managed to build another Soekris Net4501
with an Oncore UT+ I had laying around. My old CF
images from ~2008 have always served me well, but the problem being they
require a 256MB or greater CF card. Seeing as how I had a
stack of old 64MB 128MB cards lying
Please don't start a political discussion, I just have a SIMPLE TECHNICAL
QUESTION that I'm hoping someone can answer (and I don't
think it was discussed in the past).
In all the stuff I've glanced over about L2, they talk about better filtering
for GPS modules to eliminate the interference
Just got a quote of $301 for 5 lb. freight and cylinder included. 5 lb.
would do a lot of 10811's... Probably have to return the cylinder within
some time period.
Couldn't you perhaps use R-12 instead? I'm pretty sure you can still get small
canisters at auto parts stores for a heck of a lot
Unfortunately, virtually all Freon useage has been banned by the EPA (they
are said to be greenhouse gases) and the stuff in now almost unobtanium.
Actually, it's obtainable if you have a license. However most of the non-ozone
friendly Freon's they no longer are allowed to
PRODUCE in the US...
Thanks for the answer Chris. I kind of figured the max232 chip would be pulling
the signal and override any attempts to bypass it.
To the other person a little confused. The GPS in/outputs TTL signals. The
Net4501 is the same way (TTL) coming out of the CPU, but
on the board there is a max232
Also: COM2's TXD and RXD are available at 3.3V level in the GPIO connector.
Oh man I didn't know that! Time for me to take a second look at the manual.
Thanks!
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This is only pseudo time-nuts related...
I'm wiring up (yet another) net4501 with a Motorola M12 GPS..
This net4501 has the RS232 driver chip there for the 2nd serial port (previous
units I purchased didn't, which made life easier for
me).
Can I solder my GPS tx/rx lines on the ttl side of the
I was just thinking (dangerous I know)... Has anyone attempted to build a
stand-alone oscillator that is disciplined via NTP?
i.e. NTP keeps it on-frequency... And I'm not talking about NTP that is locked
to a local GPS, I'm curious about purely syncing to
other NTP servers over a network. (The
Hal,
I believe by default the maxpoll is 10 (1024 seconds / ~17min)... If you
manually set each server in your config I think the max
setting can be as high as 14 or 17 (maybe higher?), which can bump it into the
hours / days range... Even just a bump to 12 would
give you a little over an hour
Ron,
My guess would be one of two things...
First check the EFC on the OXCO, if it's near the edge of the tuning range you
might need to adjust the Coarse Adjustment screw to
get it back to near-center of the EFC range.
Second, as Bob said, it could be the GPS receiver (I believe these had
Will Bill,
Our (commercial) three phase power is fed by only two high-voltage wires
(7,200v I think) which each pole has a pair of
transformers. I can only assume one generates the 220v single phase lines and
the other is the high-leg delta. Around here 230v
three phase delta seems to be more
I know the older style meters currently in use usually slow down over time (a
minuscule amount, but still I guess it adds up).
I do not know if the talk about demand meters and timing were about current
meters or the new smart meters...
I've seen some new meters (I'm assuming the smart ones)
When someone won't take PayPal but wants Western Union (or any
wire-transfer)... that's an instant scam red flag...
Report it to the real user if possible that he is victim of identity theft.
FYI for everyone... If you didn't know Amazon.com has their own payment system
similar to PayPal,
I have to disagree with the person that said the Net4501 is not stable. I have
two (soon to be 3) that run NTPns and they have never
needed to be touched. I've powered them down a couple times during really bad
storms because I didn't want lightning to zap them (or
my other GPS equipment).
If
Since people are showing off their clocks... I managed to get a Datum / Bancomm
bc632D display from eBay a while back and it's
pretty cool.
From what I can tell, they took an off-the-shelf model from Beta Brite (Now I
think owned by Adaptive) and put an extra board in
there with the BNC
So back to my original question (I didn't mean to spark such a debate)...
These 40,000 transmitter towers... Are they merely talking about attaching
their antennas on existing cell towers or totally new
deployment?
FWIW, perhaps there wouldn't be as much of a fiasco if every other navigation
Guys, I gotta ask, what does this have to do with time keeping? Am I
missing something?
-Bob
I know it's kind of a tangent, but when people were talking about phones
radio broadcasting the time.. It just happened to be the
same time I was browsing around Google Earth.
Also many people on
I was just browsing around on Google Earth and came across this cluster of
transmission towers... Anyone care to take a guess what
they are for?
Television, radio, navigation... or something else? Looks like 11 towers...
29° 59' 34N, 95° 28' 24W
If you use the offset command, you can correct this bias but it will
be at the cost of moving your hardware 1pps output off an equivalent
amount in the opposite direction.
Greg, that's understandable. I don't use the PPS output from these boxes so
that isn't really a concern for me. Besides
Greg,
I guess I had to wait until my coffee kicked in this morning before it clicked
that it was in nanoseconds... I'm trying -3000 to see
where that gets me, it seems to be nudging the time more in-line with my other
NTP servers.
As others have asked, how do we get this value to be persistent
To all:
I ran the root eng ee info on my two TS2100s, both were originally IRIG units
but I upgraded them myself to GPS models...
Both my OCXO unit and TCXO unit reported
As for the parameters in my timing / utils directory, here's both models:
OCXO (MTI 240-0530-D)
Instead of using the DOS program, why not use the WinOncore program?
http://www.rabel.org/archives/Motorola_Oncore/winoncore12_1_2.exe
http://www.rabel.org/archives/Motorola_Oncore/winoncore_readme.txt
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Hi Bob,
I don't think it's a standard model. I got mine off eBay years ago... I haven't
seen any more with the same setup in quite a while.
Probably some large OEM order for a specific project that ended up never
happening.
Yes, it only has one Ethernet port, no PCI slot, and the MAX232 chip
I hope this doesn't get mangled too much via email... Below is an output of
ntpq -p on one machine.
remote refid st t when poll reach delay offset jitter
==
*NET4501-1 .GPS.1 u
Mike,
IIRC you link: /dev/oncore.pps.0 to /dev/elan-mmcr
But then you also need to maybe set a flag to make sure it triggers on assert
(and not clear)?
I'm putting together an NTP server on a Soekris NET4501, using an
Oncore M12+. I can't get the Atom PPS refclock to load, it reports
Poul-Henning Russell,
Thanks for the inputs, and I'm pretty sure both of your responses are / could
be attributing to the offset. Right now my GPS antenna
is mounted in a window and doesn't get the best view of the sky. After
checking, each machine does think it is in a different
location
Just thought I would share a quick pic of my latest home built NTP server. I'm
proud of it, I don't care if you aren't... :P
http://www.rabel.org/pics/Net4501-2.jpg
It is about as simple as one can get... Net4501 w/ Motorola Oncore M12+T.. all
direct wiring, no extra components really needed
Tom,
I saw you won the auction for the FTS 4065A... It looks in pretty pristine
condition. If you wouldn't mind posting a blurb on the
list about how it runs (sometime in the future) I'm sure everyone would love to
hear about it.
___
time-nuts
+1 for the Willem Programmer's I had an older model (serial port
connection), but I used it TONS of times fixing corrupt BIOSes
on computers back in the days... I keep meaning to get me one of the newer USB
models... Like you said, they have various adapters
to support just about every
This is slightly off on a tangent, but has to do with licenses...
I had some old Alteon equipment which I needed a firmware update for. Nortel
bought Alteon, but they continued the products and
updates (for a while).
Most the products were EOL (including the one I had), we're talking past
I wish Symmetricom would release source to the old TrueTime / Datum products...
But I'm sure most of that source code has been lost
/ thrown away.
For instance, the older network time servers are much cooler to me than the new
models. The old stuff was custom designed and
specifically written /
I know there was a 5061B listed on Fleabay a couple times and never sold (I
think I even saw it on Craigslist)...
It's located in Houston, TX... IIRC their offices are relatively close to me, I
would be more than willing to drive down there and
test out this unit and report back any numbers /
Why bother buying a cert? Just create a self-signed one (and you can make it
for like 10+ years)... It's not like he's selling stuff
from his website...
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Nothing wrong with wanting to use a Rb as the clock source for the board. I
*almost* decided to go that route since I had a spare
LPRO sitting around. But I realized that I would never need that long of
hold-over so it would kind of be a waste. I've been looking
at some cheap ($20 USD) 1PPM TCXO
Actually I was planning on getting a 33.8688 MHz TCXO, apparently there's a few
sellers with them because they are used for
audiophiles in their CD players? That way I don't have to use a clock-block or
other circuitry to get a usable frequency.
Have a look on ebay.280567398921. quite
Sometimes when I see insanely high purchases for items when there are
near-identical listings it makes me suspicious that perhaps
the buyer was using a second account to make a fake purchase. Possibly to
either add more positive ratings or maybe artificially
make people think an item is worth
Said,
Are those using the u-blox receivers? (I don't know of any other company with a
50 channel receiver.) If so, what's your overall
opinion of them?
Jason
one more product line: all of our Jackson Labs Technologies, Inc.
FireFly-1A and FireFly-IIA based GPSDO Timing products use WAAS by
Just curious, but which popular GPS timing receivers work with WAAS?
The only one I can think of off the top of my head is that Garmin hockey puck.
Jason
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Since we are talking about defunct systems
What was the time accuracy from the GOES satellites when they were transmitting
time?
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I know a few people were toying with the notion of upgrading their Tymserve
2100's with the LPRO module, and I'm not really sure
what came of that.
Has anyone tried to upgrade their unit from a TCXO to an OCXO? It looks like a
couple sizes will fit on the board. My only concerns
before
What about Symmetricom XPRO Rubidium? It says on the data sheet they have a low
aging rate option (1e-11 / month).
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and
Just curious, did anyone experiment any further to add in an LPRO into their
TS-2100?
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Other turn-key companies (that I know of):
http://www.endruntechnologies.com/
http://www.ese-web.com/
http://www.spectracomcorp.com/
http://www.brandywinecomm.com/
http://www.zyfer.com/
You can also search ebay for older hardware that was swallowed up by
Symmetricom like TrueTime and Datum.
Is anyone familiar with the HP/Agilent 54111D O-scope? Good / bad /
indifferent? I found a guy selling one locally for $250, and
includes the 54114A test set. Seems like a good deal (is it?), right now I just
have an old Tek 2215 (60MHz) which is somewhat
limited (to say the least).
Ehhh... It's all relative... ;)
Besides, we all know it's not the size of the clock that matters... It's how
accurate it is... :)
I nominate TvB for master time keeper!
On a more serious note, I don't think that the world's time scale will change
anytime soon. Think of all the current clocks
My first email from yesterday I think got rejected or put in queue because I
tried to attach a picture... Hopefully this will make
it through.
I *think* the Rb model had a slightly different top panel (judging from the few
pictures I've seen)... Probably made to either
absorb some of the heat
Hey Guys,
I hate to spam the list like this since I haven't posted anything in a long
time, but I know you're a good group of people. Times
are tough and it's time for me to sell off some items that I don't really use
or need. I would rather have these items find a good
home and just break
I have a PDF copy of the manual online for whoever was asking:
http://www.rabel.org/archives/Brandywine_GPS/
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and follow the
I was going to suggest using a GPS splitter too, but with a twist.
You can find a Bias Tee to block the DC current from the Ashtech (and
optionally sink it to ground if it monitors current). That way
there is no chance the 10v will reach your antenna.
Jason
Jeroen,
I have v2.1 v2.2 of the PDF Manual. No real differences that I can see, just
a couple non-necessary pages.
The only other bit of info I have that might be of some use, I saved the
startup text a while back, it should look something like
this:
L=load ESC=RUN.
Initialise - Clear
Dave,
Fedora will be fine as a basic network time server. If NTP isn't already
installed on the system, all you have to do is type (as
root):
yum install ntp
The default config usually queries the NTP Pool. Depending on where you live
you might want to edit the file to use only your
country's
Jeroen,
I have a GPS-4 too and gathered some documentation for it a while back. I'll
have to dig around on my hard drive but I seem to
recall having at least two versions of the PDF manual. I do not know what the
difference was between them. Anything I can find I'll
be sure to let you (and the
Hey guys,
I hate to pollute the list with FS stuff, but I'm just trying to give back a
little.
I jumped in on the first group buy and got two tbolts on an impulse, but
really all I need is one. Since the thunderbolts seem to be out of stock
(again) and people have been asking about them, I
Thanks to everyone that emailed me, the unit is sold! I think the first
reply I got was within 5 minutes of me posting the original message!
Jason
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Skip,
I've successfully converted my TS2100 IRIG to a GPS model along with several
other people. As far as I know, the Oncore module was never used (maybe a
planned future upgrade), but the ACE-III modules work just fine.
The trick is you need to make a temporary interface with your ACE-III and
Alberto,
I have a bunch of PDFs and the old dos labmon program on the Jupiter 8
series:
http://www.rabel.org/archives/Rockwell_Jupiter_8/
The 5V 3.3V have a different main power pin. Each version has the other
pin omitted so you don't accidently feed it the wrong power. Pin 2 is for
5V, Pin 4
Hi everybody;
I just got a Motorola Oncore+ GPS receiver for use with a disciplined
Frequency standard I'm building and was wondering if anyone could tell me
if it will be useful for this purpose.
The part number is R5122U1154. I know it's a bit late to ask this
question after the purchase
I have lightning protector that uses those gas tubes. I have yet to hook it
up though... My GPS antenna is mounted on a metal building so I'm probably a
prime candidate for a lightning attractor. The antenna is mounted on a
plastic pole giving a little isolation from the building itself though...
Can someone tell me the difference between the various versions of the
4065
Cesium TF standard?
I tried to find out that info too (because of the eBay listing). All I could
find was the Symmetricom manual for the 'C' model. Oh, and TVB had a few
pictures / references on his site, maybe either
I am about to put together a little time server for my office network
based on a Trimble ACE II GPS unit and a single-board computer with a
Pentium MMX CPU.
Assuming that the main function of this computer is to run ntpd with
PPS, what is the current best choice of OS - also taking into
Trimble also offers a freeware planning program. There's a few other of the
big name companies that offer similar products. It will tell you when a
satellite will be in view and lots of other great info.
http://www.trimble.com/planningsoftware.shtml
Does the power source for just a GPS module matter that much? Most that I've
seen just use a cheap wallwort and a lm-whatever 5v regulator chip...
nothing fancy.
My second question is what do you guys think about Acopian power supplies? I
picked up a couple 24v linear gold box models with good
Just speaking of 10811 clones, I have one made by Piezo Systems,
model # 2810007-1. It fits electrically and mechanically HP boards,
and looks like a 10811. But I miss the specs. Does anybody have any info?
Thanks,
Antonio
Yep, I have one of those also. From what I gather they were used
Yeah it seems to be my location. Anyone have any other insight into
this?
It locked onto 6 satellites right away at his office.
--Don
Maybe something is jamming the transmissions near your home? Are you able to
get reception with other GPS devices?
Jason
There are manuals for a few Efratoms' on the site below. They don't have the
FRT, but they have the FRK, FRS, and M-100.
http://www.to-way.com/
Jason
I got a belated Christmas gift yesterday, an Efratom FRT Rb
frequency standard. I have the manual for the FRK-L oscillator
in the unit, but
); SAEximRunCond expanded to false
Errors-To: [EMAIL PROTECTED] RETRY
I thought Windows will give you an error unless your date matches the actual
date?
Interesting how your machine could get so far off, and maintain an incorrect
date even after you synced.
How long has your PC been running
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