There really is nothing much to this modification. The Z3801A is already
designed to easily work on either interface, but most units are configured
for RS-422 as the default. It takes perhaps a half-hour to remove a few
zero-ohm SMD resistors and solder in a header strip. The simple
On 03/31/2012 05:52 AM, Sanjeev Gupta wrote:
.
On Mar 30, 2012 10:45 PM, paul swedpaulsw...@gmail.com wrote:
I have to say that in general I have been staying clear of this thread.
But its really a surprise that they are that sloppy and basing the results
on a Vectron OCXO. Not that I have
On Fri, 30 Mar 2012 10:42:55 -0700 (PDT)
J. Forster j...@quikus.com wrote:
When doing a complex experiment, you have to be an absolute SOB about
everything. You cannot inspect in quality.
Uhm.. Have you ever visited a site of modern nuclear high energy physics?
Have you ever seen what kind of
Thomas,
Has anyone compared the M12M to the M12+?
I have done some measurements on the M12+ with typical results as shown in
http://www.ulrich-bangert.de/M12Performance.jpg
The red line is the raw phase data of the M12's PPS against a PPS derived
from a local FRK-L rubidium. Note that you do
Ulrich
can you tell us more about your pre filter?
Thank you
Bert Kehren
In a message dated 3/31/2012 6:23:49 A.M. Eastern Daylight Time,
df...@ulrich-bangert.de writes:
Thomas,
Has anyone compared the M12M to the M12+?
I have done some measurements on the M12+ with typical results as
On 03/31/2012 08:11 AM, Hal Murray wrote:
There really is nothing much to this modification. The Z3801A is already
designed to easily work on either interface, but most units are configured
for RS-422 as the default. It takes perhaps a half-hour to remove a few
zero-ohm SMD resistors and
Bert,
sometimes a manual can be a true treasure chest! Just download the PRS-10
manual at
http://www.thinksrs.com/downloads/PDFs/Manuals/PRS10m.pdf
and find starting on page 13 the complete instructions on how to build your
own GPSDO. A basic knowledge of math, programming and control theory is
Gentlemen,
i have to correct myself: The pre-filter's time constant is 1/6 of the pll
time constant and not 1/3 as i stated before. Sorry for that!
Best regards
Ulrich Bangert
-Ursprungliche Nachricht-
Von: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] Im Auftrag
Hi Ulbrich,
Sorry but not everybody a digital and/or a professional guru... can you please
be a more specific namely to show us the pre filter and other circuitif
you do not mind.
Understand that the key point is the PLL or the phase comparator
circuit.if you want to build
I think that is why John said that you cannot inspect in
quality. Every worker has to do his job right the first
time, without relying on others to catch his mistakes.
As to your questions about John Forster's competency at
complicated tasks: You clearly don't know John!
-Chuck Harris
Attila
OK, I'll study the PRS10 manual.
On Sat, Mar 31, 2012 at 3:10 PM, Erno Peres erniepe...@aol.com wrote:
Hi Ulbrich,
Sorry but not everybody a digital and/or a professional guru... can you
please be a more specific namely to show us the pre filter and other
circuitif you do not
Hello,
I’m a bit new to GPS receivers. I’m reading all about sawtooth correction of
the 1 pps output signal, on the ilotus M12M or M12+.
I understand that correction can either be hardware controlled or software
controlled.
Does anyone make a low cost stand alone board to carry out this
Has anyone figured out the other modifications possible?
About 10 years ago I added a true ~200ms PPS LED to existing holes in the
circuit board on the front panel plus a BNC connector to bring the same TTL
level signal out the back of the unit.
___
And here:
www.cnssys.com/files/PTTI/PTTI_2006.pdf
Anyway, using a Dallas/Maxim DS1023-100 delay line (and a microprocessor,
of course) you read the @@Hn data from the iLotus M12M and apply the
correction to the delay line. Of course the delay line cannot anticipate
the PPS, so that you have to
On Fri, 30 Mar 2012 10:42:55 -0700 (PDT)
J. Forster j...@quikus.com wrote:
When doing a complex experiment, you have to be an absolute SOB about
everything. You cannot inspect in quality.
Uhm.. Have you ever visited a site of modern nuclear high energy physics?
Yes.
Have you ever seen
Hal,
The beauty of the header strips is that the Z3801A can easily and quickly be
converted back to RS-422 in the future, without having to partially
dismantle the unit and do more soldering- again.
73, Eric Lemmon WB6FLY
-Original Message-
From: time-nuts-boun...@febo.com
On Sat, Mar 31, 2012 at 7:00 AM, Azelio Boriani
azelio.bori...@screen.it wrote:
And here:
www.cnssys.com/files/PTTI/PTTI_2006.pdf
Anyway, using a Dallas/Maxim DS1023-100 delay line (and a microprocessor,
of course) you read the @@Hn data from the iLotus M12M and apply the
correction to the
Yes, I am aware of that. Bayonet and threaded connectors can be mated, or
partially mated as I said. This applies to BNC, C, N, HN, TNC, SMA, APC-7,
and MS at least, but not to LEMO and some families of military and
commercial multipin connectors.
Improper mating can easily be seen on a VNA, and
Chris,
You are describing the differences and advantages of software correction versus
hardware correction.
The delay line will also have a temperature dependent drift besides the added
noise, but it does give you a real time 1pps.
The software correction requires a good time interval
Hi Chris:
I've done it both ways.
Made up a hardware corrector that used a time delay IC driven by a PIC that corrected the 1 PPS. This is great for
conditioning the 1 PPS into an SRS PSR10 oscillator.
http://www.prc68.com/I/PRS10.shtml
Also wrote some Lab View code that applied the sawtooth
I agree that you can't inspect quality into a system, but it is far to
easy to 'not inspect' quality right out of the system. Some of the new
'buzz-word' systems (TQM,6 sigma, etc.) seem to want everyone to be
their own QA inspector to lessen the involvement of independent QA. I
find that no
On Mar 31, 2012, at 12:33 PM, Brooke Clarke wrote:
But for the general first case the hardware solution with the delay line is
the only way. I think there may be an exception specifically for the PRS10
in that it may accept a sawtooth correction on the RS-232 input (I seem to
remember
Dear John and all,
I do work in high energy physics and we use LEMO and other standards.
For some years now, I have started to advertise against LEMO (in
particular the LEMO 00 size), as it is VERY sensitive to mechanical
defects and partial connection (yes, you can ..). We have found very
Sorry. click is a bad choice of words. It's more a feel as you mate them
than an audible click.
-John
=
Dear John and all,
I do work in high energy physics and we use LEMO and other standards.
For some years now, I have started to advertise against LEMO (in
particular the LEMO
On Sat, Mar 31, 2012 at 9:24 PM, Achim Vollhardt avoll...@physik.uzh.ch wrote:
I do work in high energy physics and we use LEMO and other standards. For
some years now, I have started to advertise against LEMO (in particular the
LEMO 00 size), as it is VERY sensitive to mechanical defects and
On 3/31/12 1:08 PM, Javier Serrano wrote:
On Sat, Mar 31, 2012 at 9:24 PM, Achim Vollhardtavoll...@physik.uzh.ch wrote:
I do work in high energy physics and we use LEMO and other standards. For
some years now, I have started to advertise against LEMO (in particular the
LEMO 00 size), as it is
Brooke,
Try eBay. I got mine ther (maybe from a guy in Utah). He was also sel;ling
similar spectrometers, but for a lot more money than Roland.
BTW, There are more Ocean Optics spectrometers available. If interested,
drop me a note off-list.
-John
==
Hi Achim:
SMA RF
j...@quikus.com said:
It was happenstance that the OPERA connector was mated enough to work, but
not enough to work properly.
A while ago, I was thinking that half the problem was a design error. But
then I couldn't figure out how to do it right. Maybe monitoring the pulse
height would
If you use a good design on the receivers, AGC output is virtually free.
It doesn't take much more to run that signal to a go/no go comparator.
-John
j...@quikus.com said:
It was happenstance that the OPERA connector was mated enough to work,
but
not enough to work properly.
Remember, there are two varieties of SMA: Those with a gold plated center
pin soldered onto the center conductor and those with a sharpened center
conductor of 0.141 hard line.
The latter are near junk, IMO.
-John
==
On 3/31/12 1:15 PM, Brooke Clarke wrote:
Hi Achim:
SMA RF
On 3/31/12 8:21 AM, Eric Lemmon wrote:
Hal,
The beauty of the header strips is that the Z3801A can easily and quickly be
converted back to RS-422 in the future, without having to partially
dismantle the unit and do more soldering- again.
true, but you have to remove the board from the case
On 3/31/12 1:46 PM, J. Forster wrote:
Remember, there are two varieties of SMA: Those with a gold plated center
pin soldered onto the center conductor and those with a sharpened center
conductor of 0.141 hard line.
The latter are near junk, IMO.
Only if you're planning on multiple
mar...@ptsyst.com said:
Iâve seen that the peak to peak jitter is reduced from something like 27 ns
to 10 ns.
Is this a reduction of just the jitter, or is the actual accuracy to UTC
also improved by this amount.
Have you read the hanging-bridges paper?
Tom Clark and Rick Hambly:
You can save some bucks by buying a Little IMP tubing bender that takes
1/8 OD tubing for about $10 at Home Depot.
1/8 = 0.125 which is very close to 0.141. Two minutes with a rattail
file and Voila.
-John
On 3/31/12 1:46 PM, J. Forster wrote:
Remember, there are two
On 03/31/2012 10:29 PM, Jim Lux wrote:
On 3/31/12 12:24 PM, Achim Vollhardt wrote:
Dear John and all,
I do work in high energy physics and we use LEMO and other standards.
For some years now, I have started to advertise against LEMO (in
particular the LEMO 00 size), as it is VERY sensitive to
On 03/31/2012 10:08 PM, Javier Serrano wrote:
On Sat, Mar 31, 2012 at 9:24 PM, Achim Vollhardtavoll...@physik.uzh.ch wrote:
I do work in high energy physics and we use LEMO and other standards. For
some years now, I have started to advertise against LEMO (in particular the
LEMO 00 size), as it
On 3/31/12 3:24 PM, Hal Murray wrote:
jim...@earthlink.net said:
I can't see ever changing mine back. I could see going in and modifying it
to put a USB/serial dongle inside, so it would have a USB jack on it, since
serial ports are become less common.
I have several USB-Serial dongles.
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