Just to let you know that I received my replacement NS-T receiver and verified
that that problem is fixed.
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NAVCEN issued an alert regarding receiver errors in handling the current
pending leap second data like has occurred with the Skytraq receiver.
Several brands/models were affected. I have not seen the original alert,
but here is an article summarizing:
http://www.insidegnss.com/node/4398
Keith
We have received some additional information from Skytraq regarding the
leap second error:
The faulty version firmware indicates leap seconds (17) from now to June
16th (two weeks before June 30th). During June 16th ~ June 30th, leap
second will recover to 16 and change properly to 17 on June
I have verified the Skytraq claim on my stand alone NS-T.
Tue Jan 27 06:52:06 UTC 2015
$GPGGA,065206.000,4847.3506,N,00216.3005,E,1,06,1.3,191.0,M,47.0,M,,*59
Tue Jan 27 06:52:06 UTC 2015 $GPGLL,4847.3506,N,00216.3005,E,065206.000,A,A*52
Tue Jan 27 06:52:06 UTC 2015
I have verified the Skytraq claim on my stand alone NS-T.
Tue Jan 27 06:52:06 UTC 2015 $GPGGA,065206.000,4847.3506
Hi Mike,
Please use more precise timestamps so your results can be believed. In general
it's not adequate to use one second unix time stamps to identify a possible one
second
Skytraq has provided updated firmware that corrects the 1 second offset.
For those who have not already, please contact us off list for return
instructions to have your unit updated.
Thank you for your patience with this issue. According to Skytraq the
error was introduced when code was added
Odd indeed. My LTE-lite is one second late, appears to have already added the
pending leap second.
I can compare with four other GPS timeing receivers using time pulse on DCD
line. The NMEA data
reports in error. I am awaiting reply from JL. This is not good for an eBay
sniper
Bill,
We have confirmed this issue with the Skytraq firmware on the LTE-Lite and
are working with Skytraq to obtain a firmware update. I will post again
when a firmware update is available.
Keith
Keith
On Sun, Jan 25, 2015 at 5:47 PM, Bill Beam wb...@gci.net wrote:
Odd indeed. My LTE-lite is one
Skytraq has also confirmed the issue and is working on a firmware update.
Updating the Skytraq firmware on the LTE-Lite Eval Board requires the unit
be returned to Jackson Labs for reprogramming. We will update the Skytraq
firmware on units at no charge if units are returned to us. Please
Be careful with 'eyeball data'. GPS receiver does not generate NMEA time data
and the leading edge of PPS at the same time.
Programs like Tac32 (totally accurate clock) and Lady Heather increment the
time display at the leading edge of PPS with a
value 1 second greater than the previous NMEA
Yes there is certainly an error here:
With my timing module I was just eyeballing the output on a windows platform ,
comparing GUI data.
I have just linked the module up to a BeagleBone Black sync’d with NTP and this
is the NMEA msg log:
root@bb3:/home/mike/serial-ports# while read GGA; do echo
- Original Message -
From: Paul tic-...@bodosom.net
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Friday, January 23, 2015 8:58 PM
Subject: [time-nuts] LTE Lite time error
I see a one second error in the NMEA string from my LTE Lite.
It lost a second
I see a one second error in the NMEA string from my LTE Lite.
It lost a second between 23:33:34 and 23:33:42 21-Jan-2015 UTC.
I happened to check because a report of a one second error in some NTP pool
servers.
Just a heads up -- I'll be following up with JL directly.
--
Paul
On 5 Dec 2014 07:05, David J Taylor david-tay...@blueyonder.co.uk wrote:
David it always does a survey. Though even while doing that the frequency
output is fine after its had a bit to stabilize. I wanted to bring the
survey lamp out to a front panel LED however that appeared to be more work
Have you considered to use a light pipe? Hopefully you could get enough
light out. Or is all else fails, use a photodiode to detect the light and
drive an LED.
Dave.
Good suggestion, Dave.
Light pipes used to be very popular, but I couldn't find one when
I think the name light pipe has been supplanted by fiber-optic.
-Chuck Harris
David J Taylor wrote:
Have you considered to use a light pipe? Hopefully you could get enough
light out. Or is all else fails, use a photodiode to detect the light and
drive an LED.
Dave.
On 5 Dec 2014 13:19, Chuck Harris cfhar...@erols.com wrote:
I think the name light pipe has been supplanted by fiber-optic.
-Chuck Harris
Technically I agree that they have a lot in common. But I think the large
devices, which are often not cylindrical, are usually called light pipes.
We were talking about remotely viewing light from small things
like LED's. I hardly think that telling me about a 1m diameter
solar light pipe, or the marvels of ancient Egyptians is relevant.
I see two types of devices used for moving light remotely:
1) fiber optic, which is a standardized
That is a good suggestion. But I fall into the camp. Not really that
important now.
At least not to get me to pull it out of the rack. :-)
The little LED are pretty bright and I remember some broadcast equipment
used light pipes.
OK now I am going to get silly but this is time-nuts. I think light
Mount the LTE-lite to the front panel with a cutout and a green bezel so
you can see the LEDs directly.
--
Brian Lloyd
Lloyd Aviation
706 Flightline Drive
Spring Branch, TX 78070
br...@lloyd.aero
+1.210.802-8FLY (1.210.802-8359)
___
time-nuts mailing
The OP said he couldn't find anything applicable when he was
looking for light pipe. So, I offered him a suggestion for
why. Ultimately, we are talking about locating something
using a search engine.
The public has taken to the high tech sounding term fiber optic
to describe what used to be
actually, Magritte had it: “this is not a pipe”
Don
On Dec 5, 2014, at 8:01 AM, Chuck Harris cfhar...@erols.com wrote:
The OP said he couldn't find anything applicable when he was
looking for light pipe. So, I offered him a suggestion for
why. Ultimately, we are talking about locating
I finally took an ineterest in this thread, because I have needed (rather
infrequently) a way to get LED light from a PCB to a front panel. I Googled
flexible light pipe (no quotes in the Google search) and got loads of hits
for them. So, I guess they're called pipes after all. And they're
On 5 Dec 2014 20:05, Dave M dgmin...@mediacombb.net wrote:
I finally took an ineterest in this thread, because I have needed (rather
infrequently) a way to get LED light from a PCB to a front panel. I
Googled flexible light pipe (no quotes in the Google search) and got
loads of hits for them.
With the LTE-Lite, are the survey results held in non-volatile memory, or
does it need to do a survey each time it is switched on? This is a fixed
location.
The survey light is still on after a number of hours of operation (but it
may have gone off in the meanwhile), and the GPS light
David it always does a survey. Though even while doing that the frequency
output is fine after its had a bit to stabilize. I wanted to bring the
survey lamp out to a front panel LED however that appeared to be more work
and risk then the value.
The documentation says that from time to time it will
David it always does a survey. Though even while doing that the frequency
output is fine after its had a bit to stabilize. I wanted to bring the
survey lamp out to a front panel LED however that appeared to be more work
and risk then the value.
The documentation says that from time to time it
SO, I just connected my third LTE-Lite unit.
By the time the software drivers were installed, and I selected U-center
to the new COMM port, it had a fix. Even with the survey LED still
blinking.
I looked at the GoogleEarth view, and the fix is within six feet of
where the antenna really is.
I have for sale a 2 week old 10 Mhz LTE-Lite with power supply, right angle
jumpers, and antenna as shipped from Said. An excellent unit - in about 15
minutes it will be within a few parts of 10e10. I am selling it as it would
not work out for a project I was working on. $ 175.00 including
Hi
Just so the rest of the world does not freak out when they look at accuracy
compared to Google:
Depending on just where you are, Google Maps / Google Earth can be more or less
accurate. It’s not at all uncommon to find horizontal errors 20 feet. I have
seen this with multiple locations
Hi,
Just a word of caution here:
Do not trust Google Earth data for any precision work. The mentioned six
feet are probably due to the geographical data, not to the precission
of your GPS unit. If you look for image seams you can verify the kind
of errors involved.
Google Earth is not a
eb4...@cembreros.jazztel.es said:
Do not trust Google Earth data for any precision work. The mentioned six
feet are probably due to the geographical data, not to the precission of
your GPS unit. If you look for image seams you can verify the kind of
errors involved.
How good are USGS
Hi
You *know* what’s going to happen (it always does):
You’ll get the LTE sold and the next day another project will pop up that it
would be absolutely perfect for :)
Bob
On Nov 30, 2014, at 12:48 PM, billriches bill.ric...@verizon.net wrote:
I have for sale a 2 week old 10 Mhz LTE-Lite
Ignacio:
Gracias.
I only mentioned the GoogleEarth as an indicator . . .
Setenta y Tres,
Jim
wb4...@amsat.org
On 11/30/2014 4:11 PM, EB4APL wrote:
Hi,
Just a word of caution here:
Do not trust Google Earth data for any precision work. The mentioned
six feet are probably due to the
On 30 November 2014 at 21:38, Bob Camp kb...@n1k.org wrote:
Hi
You *know* what’s going to happen (it always does):
You’ll get the LTE sold and the next day another project will pop up that it
would be absolutely perfect for :)
Bob
I don't know what the warranty situation would be on a
On 11/30/14, 1:49 PM, Hal Murray wrote:
eb4...@cembreros.jazztel.es said:
Do not trust Google Earth data for any precision work. The mentioned six
feet are probably due to the geographical data, not to the precission of
your GPS unit. If you look for image seams you can verify the kind of
On 30/11/2014 a las 22:49, Hal Murray wrote:
eb4...@cembreros.jazztel.es said:
Do not trust Google Earth data for any precision work. The mentioned six
feet are probably due to the geographical data, not to the precission of
your GPS unit. If you look for image seams you can verify the kind
Gents
I have a S14WI GPS antenna splitter w. Opt :
Amplified + DC Bias Select + Ant Current monitor
It's connected to a Maxrad 40dB ice cone timing antenna
DS for the spliter here
http://www.amtechs.co.jp/2_gps/pdf/S14WI_spec.pdf
http://tinyurl.com/nfmpyqm
Currently i have this connected :
xne...@luna.dyndns.dk said:
The LTE-Lite is 3v3 , and wouldn't like to get 5v on it's antenna.
I'd put a voltmeter on that connector and see if the splitter is sending
anything out.
My scan of the data sheet looks like it will do the right thing.
--
These are my opinions. I hate spam.
: [time-nuts] LTE-Lite and
- S14WI 1x4 GPS splitter /divdiv
/divGents
I have a S14WI GPS antenna splitter w. Opt :
Amplified + DC Bias Select + Ant Current monitor
It's connected to a Maxrad 40dB ice cone timing antenna
DS for the spliter here
http://www.amtechs.co.jp/2_gps/pdf/S14WI_spec.pdf
http
On Sat, 29 Nov 2014 10:54:17 +0100, Björn wrote:
Hi!
The splitter will not route 5V back out to another splitter port. Your
gpsd(tcx)o antenna port is safe.
Thanx Hal Björn
I have connected it , and it seems to be running fine
It has been on for about 1 hr now.
Want to thank everyone for the various comments and insights of the LTE,
filters, buffers etc.
My unit is built up including dividers and distribution amps and simply
need to drill a few holes in the front panel for on/off switch and a few
status lamps some 16 BNC's.
I want to thank both Bob and
. But, contact them. They'll
fix you right up.
By the way, if your ports are labeled, PDC = powered DC and BDC = blocked DC.
Bob - AE6RV
From: cfo xne...@luna.dyndns.dk
To: time-nuts@febo.com
Sent: Saturday, November 29, 2014 1:53 AM
Subject: [time-nuts] LTE-Lite and - S14WI 1x4 GPS splitter
, 2014 1:53 AM
Subject: [time-nuts] LTE-Lite and - S14WI 1x4 GPS splitter
Gents
I have a S14WI GPS antenna splitter w. Opt :
Amplified + DC Bias Select + Ant Current monitor
It's connected to a Maxrad 40dB ice cone timing antenna
DS for the spliter here
http://www.amtechs.co.jp/2_gps/pdf
Hi
You can check part of the performance of the buffers with your ‘scope. Trigger
on the input and look at the output. Depending on what sort of scope you have,
you might get sub ns.
Of course you also could simply trust that logic gates have pretty stable delay
specs.
Bob
On Nov 29, 2014,
Hi
If you are looking at the 10 MHz outputs and want to see what they are doing -
feed a pair of outputs into a double balanced mixer. You will get an IF output
that tracks the phase between the two outputs. Best to do it with 90 degrees of
coax shifting things so you get a zero output. Track
All:
After running my 20 MHz LTE-Lite for a week or so, I shut it down and
connected one of the 10 MHz units.
The LEDs appear to be responding (survey still in progress) as per the
quick start guide.
Windows installed a new comm port and driver. (COMM6, with FTDI
driver) The COMM5 port
Hi
The “new chip ID, new com port” thing is pretty typical for the FTDI drivers.
If you plug the old LTE back in there’s a good chance it will come back up as
COMM 5. Usually they are pretty good about only adding ports for devices they
have not seen before.
Bob
On Nov 28, 2014, at 3:23 PM,
All:
Sharing lessons learned the hard way . . .
After messing around with my Anti-Virus program, which declared some
false threats, messing with drivers, and uninstalling/reinstalling
Ublox, I put the 20 MHz unit back on line. Instantly came up and showed
data in UBLOX.
Shut it down,
kb...@n1k.org said:
The ânew chip ID, new com portâ thing is pretty typical for the FTDI
drivers. If you plug the old LTE back in thereâs a good chance it will come
back up as COMM 5. Usually they are pretty good about only adding ports for
devices they have not seen before.
Most/some
On Fri, Nov 28, 2014 at 3:42 PM, Hal Murray hmur...@megapathdsl.net wrote:
kb...@n1k.org said:
The “new chip ID, new com port” thing is pretty typical for the FTDI
drivers. If you plug the old LTE back in there’s a good chance it will
come
back up as COMM 5. Usually they are pretty good
-pl2303-reliable-device-names-4175506134/
Bob
From: Orin Eman orin.e...@gmail.com
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Friday, November 28, 2014 11:41 PM
Subject: Re: [time-nuts] LTE-Lite
On Fri, Nov 28, 2014 at 3:42 PM, Hal Murray hmur
As I say a most useless website.
Regards
On Tue, Nov 25, 2014 at 10:35 PM, Dave Martindale dave.martind...@gmail.com
wrote:
I spent a bit of time poking around the SkyTraq web site on the weekend. I
couldn't find a datasheet for the chip on the LTE-Lite - perhaps it's so
new that SkyTraq
Said,
Your drawing looks better than those by Bob Pease, and he was never
embarrassed by his :)
Thank you for your extensive contributions to time nuts
Didier KO4BB
On Tue, Nov 25, 2014 at 7:28 PM, S. Jackson via time-nuts
time-nuts@febo.com wrote:
Guys,
I never expected such an intense
:)
Sent From iPhone
On Nov 26, 2014, at 9:20, Didier Juges shali...@gmail.com wrote:
Said,
Your drawing looks better than those by Bob Pease, and he was never
embarrassed by his :)
Thank you for your extensive contributions to time nuts
Didier KO4BB
On Tue, Nov 25, 2014 at 7:28
Interesting comment. . . . I'm reading Bob's book now!
Never met him, but felt like I knew him from all of his writings.
His death was very sad
Jim
wb4...@amsat.org
On 11/26/2014 12:20 PM, Didier Juges wrote:
Said,
Your drawing looks better than those byBob Pease, and he was never
Jim,
A double tragedy. I was working with Jim Williams on one of our designs a week
before he passed away. Then Bob crashed his car coming from Jim's funeral
(grief?) and died too.
Two of the greatest analog minds lost within days.
Bye,
Said
Sent From iPhone
On Nov 26, 2014, at 9:34, Jim
Hi!
Navspark has one board with Glonass
(http://navspark.mybigcommerce.com/navspark-gl-arduino-compatible-development-board-with-gps-glonass/)
and one board with Beidou
(http://navspark.mybigcommerce.com/navspark-bd-arduino-compatible-development-board-with-gps-beidou/).
Both
use a Venus 8
Poul are you teferring to the lte lite specifically? My Resolution SMT GG
will go single sat or OD mode with only non GPS sats available.
On Tuesday, November 25, 2014, Poul-Henning Kamp p...@phk.freebsd.dk wrote:
In message 7da89.51b7dfcf.41a65...@aol.com javascript:;, S. Jackson
Didier:
Please DO share. Thanks!
Jim
On 11/25/2014 7:47 PM, Didier Juges wrote:
Jim,
I have somewhere a piece of VB 6.0 code that decodes NMEA sentences and puts it
pretty on the screen (at least that's how I remember it :). I am not at home at
the moment but I'll be glad to send it to you
On 25 November 2014 at 19:51, S. Jackson via time-nuts
time-nuts@febo.com wrote:
Jim,
please remember you need proper lightning protection if you put the antenna
outside..
bye,
Said
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Sorry, seems this did not show first time.
Edésio
On Tue, Nov 25, 2014 at 09:16:20PM -0200, Edesio Costa e Silva wrote:
Hi!
Navspark has one board with Glonass
(http://navspark.mybigcommerce.com/navspark-gl-arduino-compatible-development-board-with-gps-glonass/)
and one board with Beidou
yes please!
Don
On Nov 26, 2014, at 11:45 AM, Jim Sanford wb4...@wb4gcs.org wrote:
Didier:
Please DO share. Thanks!
Jim
On 11/25/2014 7:47 PM, Didier Juges wrote:
Jim,
I have somewhere a piece of VB 6.0 code that decodes NMEA sentences and puts
it pretty on the screen (at least
I have one of the LTE-Lite 20Mhz units and plan to use it as a frequency
reference for my ham radio gear. My planned setup is as follows:
I'm putting it in the recommended Hammond enclosure powered by a USB cable
from my PC. I had originally planned to use the wall wart provided but I
want to get
Jim,
please remember you need proper lightning protection if you put the antenna
outside..
bye,
Said
In a message dated 11/25/2014 11:43:09 Pacific Standard Time, jim@jtmil
ler.com writes:
I have one of the LTE-Lite 20Mhz units and plan to use it as a frequency
reference for my ham
Jim
Because of the short runs you should be quite fine with your approach. I
used the 74HC version to do my dividing using the second section to get 5
MHz. Lots of gear still uses that.
Frankly ublox and such don't show you much and I am using PUTTY.
There is another pgm from India but shows much
On 25 November 2014 at 19:42, Jim Miller j...@jtmiller.com wrote:
I'm putting it in the recommended Hammond enclosure powered by a USB cable
from my PC. I had originally planned to use the wall wart provided but I
want to get status from the unit without hacking a window in the top to see
the
Here is a link to a company that at least shares details of the SkyTraq
venus 8 chip on the LTE-Lite. The actual skytraq sites is pretty useless.
https://www.tindie.com/products/smokingresistor/venus838flpx-gps-breakout-board/
There is a program that will read the nema codes and such also.
Have
Now that the cat is out of the bag - notice that on these boards we used
the special -T timing version which is more than twice as expensive than the
normal navigation version used by others.. I personally use the uBlox
software because the Skytrack software had a habit of crashing itself
Said
Really did not run it very long a few hours.
In that time it ran fine and on Vista no less. Now thats scary.
The fact that it had my location and insists on Asia along with fixed
screen scaling hints that its half beaked.
But there was little additional value compared to ublox accept for one
In message 7da89.51b7dfcf.41a65...@aol.com, S. Jackson via time-nuts writes
:
Now that the cat is out of the bag - notice that on these boards we used
the special -T timing version which is more than twice as expensive than the
normal navigation version used by others..
That
Thanks for the link. The Navspark also uses a Venus GPS, but I don't know
if it the same one. I can't look it up at the moment.
Joe Gray
W5JG
On Nov 25, 2014 3:02 PM, paul swed paulsw...@gmail.com wrote:
Here is a link to a company that at least shares details of the SkyTraq
venus 8 chip on
Hi
I think it’s more a supply and demand thing right now. There are a lot of
systems (CDMA for example) that run on GPS time. There do not seem to be quite
as many people putting out spec’s for the other systems (yet).
Bob
On Nov 25, 2014, at 5:29 PM, Poul-Henning Kamp p...@phk.freebsd.dk
We evaluated a Glonass unit for 1PPS and it was really quite bad. Unless you
are near the poles or get jammed a lot I would not see much advantage..
Sent From iPhone
On Nov 25, 2014, at 15:10, Bob Camp kb...@n1k.org wrote:
Hi
I think it’s more a supply and demand thing right now. There
Jim,
I have somewhere a piece of VB 6.0 code that decodes NMEA sentences and puts it
pretty on the screen (at least that's how I remember it :). I am not at home at
the moment but I'll be glad to send it to you if you are interested. May not do
what you want, but it will get you started.
Guys,
I never expected such an intense discussion about using and buffering the
outputs from the LTE-Lite board since the actual circuit to use can be
quite simple.
To address these questions, I drew up a simple schematic that uses a DIP-14
74AC04 gate, six resistors, and two caps.
Hi
If you decide to run the circuit from +5V, get the 74ACT04 instead of the
74AC04. It will trigger better on the 3.3V output from the LTE.
The 74AC(T)04 will not in any way impact the phase noise or ADEV coming out of
the LTE, if a reasonable supply is used…
With a decent PCB layout and
Hi Mark, Bob,
two comments:
* I forgot to mention that feeding the 1PPS signal through the IC inverts
the signal of course, so the falling edge becomes the active edge. Use the
two inverters in series rather than parallel to avoid that problem, at the
cost of lower drive capability and
Hi
One simple point:
Do you *need* ultra low phase noise on your 1 pps output or is real good ADEV
all you are after?
If you need good phase noise .. exactly what are you doing ???
So… tack a 78L05 onto your bulk power and run the pps output “empire” off of
that supply. Maybe wire the 1 pps
Bob,
Its not the 1PPS that would be suffering, its the 10MHz that will have all the
1Hz and its harmonics making the PN graph look ugly..
Agree with you that the regulators cost zip these days and using individual
buffer ICs and regs is the best way to go.
Bye,
Said
Sent From iPhone
On Nov
I spent a bit of time poking around the SkyTraq web site on the weekend. I
couldn't find a datasheet for the chip on the LTE-Lite - perhaps it's so
new that SkyTraq has not put together the datasheet yet.
Under timing, they only list the Venus638LPx-T, which is a older (2011
copyright on the
My unit didn't come with right-angle pigtails as shown in the doc (and
Tom's photos). Did anyone else get straight connectors?
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My first unit came with straight connectors. I can manage.
On 11/23/2014 1:50 PM, Paul wrote:
My unit didn't come with right-angle pigtails as shown in the doc (and
Tom's photos). Did anyone else get straight connectors?
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time-nuts mailing list
Paul
Mine came with right angles.
It does make for a nicer arrangement.
Regards
Paul
WB8TSL
On Sun, Nov 23, 2014 at 2:26 PM, Jim Sanford wb4...@wb4gcs.org wrote:
My first unit came with straight connectors. I can manage.
On 11/23/2014 1:50 PM, Paul wrote:
My unit didn't come with
Nigel,
CC'ing time nuts..
R2 and R3 are stuffing options, see the schematics in the user manual.
Typically you don't have to solder anything. The default is set for the
low-noise 3.0V to be fed to the DIP-14 tcxo for best performance.
On your question on removing the SMT Tcxo, this is not
All:
Received my LTE-Lite and ready to play, EXCEPT, I'm in the basement.
Does anyone know if the antenna which the ebay purveyor of the Nortel
Thunderbolts supplies will work on the 3.3 volts coming out of the LTE
Lite? (I measured the Nortel, it puts 4.95 volts on the coax.) That
Hi
Pretty much all of the “timing” GPS antennas want to see 5V to work properly.
About the only thing I’ve seen that likes 3.3V are the modern mag mount
antennas.
Bob
On Nov 22, 2014, at 4:55 PM, Jim Sanford wb4...@wb4gcs.org wrote:
All:
Received my LTE-Lite and ready to play, EXCEPT,
Jim,
try it out. Check the C/No values in the GPGSV NMEA messages. If they are
over 40dB, then it works just fine and there is no need to over-think the
issue..
bye,
Said
In a message dated 11/22/2014 16:39:55 Pacific Standard Time, kb...@n1k.org
writes:
Hi
Pretty much all of the
Hi Jim,
not much harm should come to the 5V antenna if driven at only 3.3V.
However if you feed 5V into the LTE Lite antenna port then bad things will
happen because it will back-feed into the 3.3V power rail, and possible
damage some of the 3.3V parts on the PCB. Running a 3.3V antenna
Hi
On Nov 22, 2014, at 9:14 PM, S. Jackson via time-nuts time-nuts@febo.com
wrote:
Hi Jim,
not much harm should come to the 5V antenna if driven at only 3.3V.
However if you feed 5V into the LTE Lite antenna port then bad things will
happen because it will back-feed into the 3.3V
Hello everyone,
some info to the hole list for folks who missed out on the 20MHz LTE-Lite
Evaluation kits:
The 20MHz units shipped-out last week to all of you who ordered and should
arrive shortly.
Also, we have received feedback from the 10MHz TCXO factory that TCXOs
will ship to us
Hi Jim,
thanks for your question. The reason we put that note in there is two-fold:
1) On these 20MHz units the TCXO output in fact can drive 50 Ohms inputs as
we put a strong buffer on the board, but the synthesized RF output and the
1PPS output cannot drive 50 Ohms. Those two are CMOS
I got my LTE Lite this afternoon and have been playing with it. I have
a question on the NMEA $PSTI message: what are the last two numbers
before the checksum (in this case 30, 0)? I've noticed that once the
site survey is complete they go away, just the comma is left.
Said
Like others my unit arrived today. As I pondered the cables from the
splitter and power supplies along with lots of mcx connectors, low and
behold everything needed was in the box to get going. Its up and running,
surveyed, locked, and happy. Currently watching it against a z3801 and a
Thanks Paul, Glad you like it!
On the PSTI question from earlier: the GPS vendor snuck two additional fields
into the PSTI message on their last fw update. The two new fields are as
follows:
Position Standard Deviation Threshold
Calculated Position Standard Deviation After Self-Survey
The
Bob wrote:
PHK has a roughly 6 line code snippet that does a basic PLL. Add two
more lines to check / clamp the integrator if you wish. That's 8
lines. If you want a D term (to give it an FLL component) add 2 more
lines. We're up to 10 lines.
It's just a control loop, not a full GPSDO.
Hi
We are not talking about a system (like GPS) that has junk data coming in. In
this case, the phase detector gives you a very good estimate of the delta
between input and output in real time. The error trapping / shifting / multi
this and that simply isn’t needed in this case. The solution
Mostly we don't even write the guts of those algorithms. For example,
you'd use a PID library. One line to create a PID controller object
then one line to call the PID for each phase measurement.
This goes double for, say, drawing a graph of the phase over time to
an LCD display, you'd use a
-turn trimpot.
From: saidj...@aol.com
To: time-nuts@febo.com
Subject: Re: [time-nuts] LTE-Lite module and the pendulum...
Hi John,
while I can't tell you which vendors are affected and which are not (Its
like asking an angler for his secret angling spot :), I can say that most low
cost TCXOs
In message 766d6811-f733-4ab2-8574-24e4606e4...@aol.com, Said Jackson via tim
e-nuts writes:
Thats exactly right Bob.
By the time your ocxo jumps to catch up to the efc voltage, you
have oversteered, then the process starts in reverse and the ocxo
jumps in the opposite direction.
This
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