Ser2net is the way to go for me.
A hardware solution I have been using for this purpose for quite a while are
those tiny USB-powered SoC-based 3G / 4G portable routers from vendors like
TP-Link (good little case designs - TL-MR3020 for instance which I currently
use). The 3G models don't
Paul, W1GHZ has put together a simple doubler for the 5 MHz OCXO in the
Lucent boxes. It's based on a Minicircuits part with MIMIC amp.
Details here:
http://users.burlingtontelecom.net/~n1...@burlingtontelecom.net/images/Simple_Frequency_Doubler.pdf
Mike
--
73,
Mike, N1JEZ
A closed mouth
Hal wrote:
So driving 50 Ohms inputs is not optimal here, 1M inputs are much
better for
this purpose.
That only works if you have a (very) short connection to the next stage.
Things get interesting if you have, say, 10 feet of unterminated coax.
Thinking that the output was a sine wave, I
Looks simple but trying to order 1 piece seems a challenge.
Minicircuits wants 10 or $59. Not bad but don't need 10 :-)
Regards
Paul
WB8TSL
On Tue, Nov 25, 2014 at 6:08 AM, Mike Seguin n1...@burlingtontelecom.net
wrote:
Paul, W1GHZ has put together a simple doubler for the 5 MHz OCXO in the
The 20 MHz output should be OK, since it is series-terminated with 50 ohms
at the source and the buffer can source enough current. The driver sees a
100 ohm load (50 ohm resistor in series with 50 ohm coax impedance) for
that 32 ns round trip time, so it will increase power dissipation (as you
Give them a call... they are more than willing to sell single pieces of
almost any of their products, at the listed lowest quantity price,
especially if you are a Ham. I recently bought several items, some of them
in single quantities. Many of their MMICs are priced so low that you can
Charles,
The increased current for the driver will cause heating near the crystal in
both the CMOS driver and the 3.0V LDO as the LDO has to convert the excess
voltage into heat. This may or may not affect the crystal.
One could certainly try, this is why I initially said its certainly
Dave,
Exactly.
Sent From iPhone
On Nov 25, 2014, at 7:34, Dave Martindale dave.martind...@gmail.com wrote:
The 20 MHz output should be OK, since it is series-terminated with 50 ohms
at the source and the buffer can source enough current. The driver sees a
100 ohm load (50 ohm resistor in
You may have seen them as in
http://www.ebay.fr/itm/Ublox-LEA-6T-GPS-Module-w-Compass-for-APM2-5-APM2-6-Flight-Controller-Multirotor-/271641375221?pt=UK_ToysGames_RadioControlled_JNhash=item3f3f1671f5
There are other sellers with the same.
My idea was to see if one was suitable as a 1PPS locking
Dave call?? I don't see a #.
I have skype so easy enough.
Happy to.
Regards
Paul
WB8TSL
On Tue, Nov 25, 2014 at 10:46 AM, Dave M dgmin...@mediacombb.net wrote:
Give them a call... they are more than willing to sell single pieces of
almost any of their products, at the listed lowest quantity
A Lea-6T is only worth any extra money if you are using the sawtooth
correction data coming out of it. With out correction a $ 14 unit is just as
good.
Bert Kehren
In a message dated 11/25/2014 11:25:34 A.M. Eastern Standard Time,
michael.c...@sfr.fr writes:
You may have seen them as
I bought one of those recently. I haven't done more than power it on to see
if it works. I will probably look at it more over Thanksgiving.
Joe Gray
W5JG
On Nov 25, 2014 9:15 AM, Mike Cook michael.c...@sfr.fr wrote:
You may have seen them as in
Said wrote:
The increased current for the driver will cause heating near the
crystal in both the CMOS driver and the 3.0V LDO as the LDO has to
convert the excess voltage into heat. This may or may not affect the crystal.
There would be next to no additional heating in the CMOS driver,
Hi Mike,
It's indeed a very simple circuit, but... not if you want to double 5MHz. It's
working from 10MHz onwards and it seems there is no other version available
that goes lower. Or is it good enough to use it also for 5Mc?
Regards,
Rob.
Date: Tue, 25 Nov 2014 06:08:10 -0500
From:
Hi Rob,
It works fine at 5 MHz to double to 10 MHz. The numbers Paul listed are
for 5 to 10 MHz.
Mike
---
73,
Mike, N1JEZ
A closed mouth gathers no feet
On 2014-11-25 12:24, Rob040 . wrote:
Hi Mike,
It's indeed a very simple circuit, but... not if you want to double
5MHz. It's working
Hi Mike,
Thanks for your confirmation and indeed now I saw it. Sorry, I was confused
after looking at the datasheet of the AMK-2-13+ *shame*.
Bye,
Rob.
Date: Tue, 25 Nov 2014 12:59:07 -0500
From: n1...@burlingtontelecom.net
To: time-nuts@febo.com
Subject: Re: [time-nuts] Lucent KS-24361
Bert,
the LEA-6T actually has software bugs that show up in moving applications
and that need to be handled by the users' software, and they are selling it
for drone applications. Without any monitoring for these bugs the units
may really only be useful for stationary applications.
Why
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
That's why I said its up to the user to decide what they want their
trade-off to be.
For permanent installations I personally would not run the unbuffered 10MHz
output through more than about a foot of coax cable to the buffer.
The rise/fall time of the TCXO output is slow enough (typical
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
Hi Charles,
Thanks a bunch for the comments and the article reprints. This is just what
I was looking for to get started on my distribution amplifier.
Regards...Bill
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of Charles
Steinmetz
Sent: Tuesday,
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
Looking closely at the board, I see it uses a Venus GPS chipset. And yet
folks here are using the ublox ucenter software with it. What am I missing?
Joe Gray
W5JG
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time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
Having dived in with great enthusiasm as soon as the LTE-Lite was made
available I've had it on test for a couple of days now and have not been
disappointed, I'm very impressed.
However, given the number of existing GPS and other off air systems and
projects already running here I have to
Jim,
I assume from your previous comments that you went the FFT way.
As I was flying I had some time to kill, so I read some papers.
You should be reading FFT-Based Methods for Simulating Flicker FM by
Charles A. Greenhall of JPL. If you read it carefully enough you will
find several methods
I assume the Venus chipset NMEA output sentence set is a subset of the
uBlox NMEA output set, and the NMEA messages are sufficiently
standardized that the uCenter software can read them and display the
results in a meaningful way. Any other program that reads and displays
NMEA data (and can
NMEA is a company-independent format.. and the uBlox application is nice.
In a message dated 11/25/2014 13:08:07 Pacific Standard Time,
jg...@zianet.com writes:
Looking closely at the board, I see it uses a Venus GPS chipset. And yet
folks here are using the ublox ucenter software with
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
Hi
Based on using the same amp for other projects, I would strongly suggest
checking the phase noise / ADEV of that doubler before depending on it’s output.
Bob
On Nov 25, 2014, at 6:08 AM, Mike Seguin n1...@burlingtontelecom.net wrote:
Paul, W1GHZ has put together a simple doubler for the
Yes, I know that NMEA is standard. I assumed that your board was also
putting out proprietary messages.sounds like not.
Joe Gray
W5JG
On Nov 25, 2014 2:50 PM, S. Jackson via time-nuts time-nuts@febo.com
wrote:
NMEA is a company-independent format.. and the uBlox application is nice.
In a
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
For a modern build, the PZT3904’s and PZT’s are a pretty good way to go
with this amp.
For normal distribution to instruments, there’s really no need to do anything
this complex.
Bob
On Nov 25, 2014, at 2:34 PM, Charles Steinmetz csteinm...@yandex.com wrote:
A couple of people
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
Hi
I looked at the boards on the eBay listing. Last time I looked at the layout
guidelines for the LEA-6T’s they pretty much said “don’t do it that way” ….
Who knows what they did that board for or why they did it that way.
That’s not to say the boards don’t work. They probably do work. Often
On Tue, Nov 25, 2014 at 6:03 PM, Joseph Gray jg...@zianet.com wrote:
Yes, I know that NMEA is standard. I assumed that your board was also
putting out proprietary
messages
Yes there are two such messages. PSTI and PJLTS. STI is emitted with the
other NMEA messages and JLTS is emitted when
On 25 Nov 2014 23:10, Bob Camp kb...@n1k.org wrote:
Hi
For a modern build, the PZT3904’s and PZT’s are a pretty good way to
go with this amp.
For normal distribution to instruments, there’s really no need to do
anything this complex.
Bob
I am also thinking about the construction of a
Hey Paul thats what I look at in PUTTY.
Works for me.
On Tue, Nov 25, 2014 at 6:37 PM, Paul tic-...@bodosom.net wrote:
On Tue, Nov 25, 2014 at 6:03 PM, Joseph Gray jg...@zianet.com wrote:
Yes, I know that NMEA is standard. I assumed that your board was also
putting out proprietary
Hi Dave,
That's exactly the approach I'm going to use. Outputs that go to instruments
that might see the low noise and then outputs that go to devices that aren't
phase noise sensitive like counters, scopes, pulse generators and others.
Regards...Bill
-Original Message-
From:
Using an attenuator between the doubler output and the amplifier input
degrades the phase noise significantly.
Bruce
On Tuesday, November 25, 2014 06:00:30 PM Bob Camp wrote:
Hi
Based on using the same amp for other projects, I would strongly
suggest
checking the phase noise / ADEV of
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
An alternative is to use a Norton style amp (or other low noise high
linearity amp without stellar reverse isolation) to boost the signal level and
drive a set of high isolation output stages.
A relatively simple discrete current feedback amp may suffice.
For higher reverse isolation a cascode
It does output two proprietary messages, one from Skytrack, but not sure I
would use the Skytrack application due to the low information content of that
message and the instability of the Skytrack app. The uBlox app lets you view
the two proprietary messages too and is stable. Everyone can use
Paul,
You can listen to PJLTS on the USB and grab the Skytrack NMEA in TTL format
from pin 13 of header JP1 at the same time..
Sent From iPhone
On Nov 25, 2014, at 15:37, Paul tic-...@bodosom.net wrote:
On Tue, Nov 25, 2014 at 6:03 PM, Joseph Gray jg...@zianet.com wrote:
Yes, I know
Am 25.11.2014 um 20:34 schrieb Charles Steinmetz:
A couple of people were asking about NIST isolation amplifiers
recently. I'm attaching circuit diagrams of the 5-10 MHz amp from
1997 and the 1-200 MHz amp from 1990. I think Bruce has the papers
linked at his ko4bb.com pages.
I have built
received my Lucent KS-24361 today.
just as being described, appears new in original box. I bought one of
the pairs REF-0 and REF-1 plus one additional REF-0. There is a date of
manufacture on each box, the pair was 2000 week 20 and 21 whereas the
additional REF-0 was 2000 week 5.
I mention
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.
Hi
Harmonics are (in general) the least of your issues on a distribution amp.
There is very little difference in ADEV or instrument performance at -20 dbc
versus -120 dbc. Since filtering is relatively easy, adding another inductor
or two is about all it takes.
———
If you are going with
Hi
I’ve built that one as well. It’s a bit easier with +/- supplies.
It has the same “you need a good layout” issues as any of the other versions.
It’s got a bit higher input impedance than the others so it’s better choice for
4 outputs.
Bob
On Nov 25, 2014, at 6:53 PM, Gerhard Hoffmann
Hi
All of the pairs that I have received have been in the pink foam. They span the
date code range from 1999 (US factory) through 2000 (Korea manufacture) to 2001
(also from Korea).
The blue ones may be factory re-builds.
Bob
On Nov 25, 2014, at 7:26 PM, Graham planoph...@aei.ca wrote:
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.
Paul, there's a list of sales office contacts (depending on your location)
at http://www.minicircuits.com/contact/na_sales_reps.html (assuming that
you're in North America; if not, go to the International offices link).
Dave M
paul swed wrote:
Dave call?? I don't see a #.
I have skype so
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
Another issue is that if even one output needs high reverse isolation and
low crosstalk, then even those outputs that arent so critical will also need
high reverse isolation and low crosstalk to avoid degrading the crosstalk
to the critical output.
Bruce
On Tuesday, November 25, 2014
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
The reverse isolation of a “typical” pc layout for this sort of thing is maybe
60 db. Getting to 120 is far from simple. Achieving the 160 (or whatever)
numbers you see in some papers is “isolation nuts” territory. The circuit its
self can do great numbers. Coming up with a box that has 17
On Tue, Nov 25, 2014 at 8:10 PM, Bob Camp kb...@n1k.org wrote:
All of the pairs that I have received have been in the pink foam.
I have a 2005 pair that came in blue foam and mylar.
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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
Hi
Which would suggest that the earlier date code parts in blue foam may be some
sort of re-build.
It is interesting that the seem to be stocked in pairs. The date codes on both
boxes in each pair I’ve received have been very close to each other.
Bob
On Nov 25, 2014, at 9:35 PM, Paul
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
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