Never got my hands on it. The documentation doesnt look bad (at least
not in the 5min i invested). I think it's cheap enough to buy a couple
and try them :)
Attila Kinali
Thanks, Attila. That's just what I've done - they are now on the slow
boat from China! I had thought that someone else
First payload ready for next batch of Galileo satellites - see:
http://www.esa.int/esaNA/SEM1Z7KWZ0H_index_0.html
According to the BBC, the photo here:
http://www.esa.int/images/IMG_8364_scr.jpg
shows two hydrogen masers (long cylinders lower right, and two rubidium
clocks (silver boxes
Hello,
I seem to have been steadily collecting time related equipment and
doing very little with it, finally decided I should do something with
this, and I'd like to start out simple.
So, I have a Motorola M12+ GPS receiver in a Synergy Systems adapter
board, and one of those little Symtrik MSF
On Thu, 19 Apr 2012 08:54:35 +0200, Attila Kinali wrote:
On Wed, 18 Apr 2012 18:48:58 + (UTC) cfo
xne...@luna.dyndns.dk wrote:
Have you tried here ?
http://www.batronix.com/shop/index.html
Nope, i haven't. These prices look much more sane! Thanks a lot!
Attila Kinali
and...@carrierdetect.com said:
So, I have a Motorola M12+ GPS receiver in a Synergy Systems adapter board,
and one of those little Symtrik MSF receiver boards. I'd like to try and get
both working under Linux with ntpd (not at the same time!), and was hoping
that someone might be able to
I have the D version. What exactly doesn't work on the logic analyzer? I
haven't flogged that port. The rest of the scope works well. The PC interface
is messy on win 7 64 bit, but as I staed before, China runs on bootleg win XP.
The infamous price break on the E version happened about two
On Thu, Apr 19, 2012 at 6:18 AM, Andrew Back and...@carrierdetect.comwrote:
So, I have a Motorola M12+ GPS receiver in a Synergy Systems adapter
board, and one of those little Symtrik MSF receiver boards. I'd like
to try and get both working under Linux with ntpd (not at the same
time!), and
Hello @all,
my name is Wolfgang and i'm new to the list. :)
I browsed through the list archive, but i didn't find the infos i need,
so i decided to join the list
and to ask the experts directly. :)
I want to measure the frequency difference between a 10 MHz OCXO and a
10 MHz Rubidium.
I
Just a speculation on my part, but if you got some non-saturating logic like
ECL, the jitter would be less.
I haven't done any ECL in years, but the traces I got from ECL circuits are
amazingly clean. I was evaluating a competitions ECL DAC.
-Original Message-
From: skywatcher
Welcome,
Hello @all,
my name is Wolfgang and i'm new to the list. :)
I browsed through the list archive, but i didn't find the infos i need,
so i decided to join the list
and to ask the experts directly. :)
I want to measure the frequency difference between a 10 MHz OCXO and a
10 MHz
Hi Wolfgang,
On 19/04/12 21:10, skywatcher wrote:
Hello @all,
my name is Wolfgang and i'm new to the list. :)
Welcome!
I want to measure the frequency difference between a 10 MHz OCXO and a
10 MHz Rubidium.
I think that's what many people here have done many times... but i don't
want to
And, if you are measuring, by analog mixing, two very slightly different
frequencies, what do you expect to obtain if not a signal that is slow,
very slow. How can you measure milliHertz or microHertz without waiting?
On Thu, Apr 19, 2012 at 9:31 PM, Magnus Danielson
mag...@rubidium.dyndns.org
Hi Wolfgang,
one of the easiest and very accurate ways to do this is simply to measure
the drift of the two 10MHz signals on an oscilloscope. Adjust the OCXO so
that this drift between the two traces is as slow as you can get it. Then
simply measure it over time. Use one signal for
Using a dual mixer time difference system (either the digital dual mixer
time difference (DDMTD) or the analog variant (DMTD)) can easily achieve
the required resolution.
The DDMTD is relatively cheap to implement however it requires an offset
oscillator to beat against the 2 signals being
Yes, and, as you can see, you have to wait 1 hour.
On Thu, Apr 19, 2012 at 9:49 PM, saidj...@aol.com wrote:
Hi Wolfgang,
one of the easiest and very accurate ways to do this is simply to measure
the drift of the two 10MHz signals on an oscilloscope. Adjust the OCXO so
that this drift
Use a dual mixer system with an offset LO.
Bruce
Azelio Boriani wrote:
And, if you are measuring, by analog mixing, two very slightly different
frequencies, what do you expect to obtain if not a signal that is slow,
very slow. How can you measure milliHertz or microHertz without waiting?
On
Of course, there are PICTIC II, DMTD, DDMTD, SR620, HP5370B, Wavecrest,
PM6681, HP53132. The simplest is using a scope and... wait.
On Thu, Apr 19, 2012 at 9:53 PM, Bruce Griffiths bruce.griffi...@xtra.co.nz
wrote:
Use a dual mixer system with an offset LO.
Bruce
Azelio Boriani wrote:
Hi Bruce,
this sounds very good, and seems to fit my requirements quite well. :)
I will have a closer look to this concept.
I also had the idea to take the reference frequency, divide it, and mix
the division result again with the reference
to get an offset to the reference frequency which
Depends on the scope..
if your scope has 100ps A-to-B measurement resolution, then waiting 5
minutes in this scenario would give 0.83ns drift, with 100ps uncertainty IF
your
oscillators were synced to ~3ppt which is very tough to do with a
free-running OCXO (It would be unrealistic to get
On Thu, 19 Apr 2012 17:40:19 +, lists-ATaFeEbBpG8qDJ6do+/SaQ wrote:
I have the D version. What exactly doesn't work on the logic analyzer? I
haven't flogged that port. The rest of the scope works well. The PC
interface is messy on win 7 64 bit, but as I staed before, China runs on
bootleg
Wolfgang
It would help if you would let us know what equipment other than a scope
you have. Also what resolution you would want to achieve. One time set up or
want to use repeatedly.
Bert Kehren
In a message dated 4/19/2012 4:53:40 P.M. Eastern Daylight Time,
saidj...@aol.com writes:
Hi Bert
I want to monitor the frequency deviation continuously (that means: i
don't want to look at a scope ;)
and log the data several times per second. The goal is not to make a
'quality test' of the oscillator,
but to look for frequency deviations which are caused by external
influences of
A non-sampling oscilloscope with limited bandwidth could just as easily
miss a narrow pulse because of bandwidth constraints no matter how
high its sampling rate.
That is the point of the thread. Even a wide bandwidth analog scope used to
show a 500nS pulse at a 200Hz repetition rate will have a
The traditional approach was to use a double-balanced mixer configured as a
phase detector, pass the phase detector output through a low-pass filter
(with 1 Hz bandwidth), and plot the result using a chart recorder. The
chart recorder would also have marks from some kind of accurate clock.
After
Wolfgang
I have quite a collection of equipment and have build Dual Mixer, PICTIC
and what I think is best for you a circuit I call the Austron circuit. For
less than $ 50 you can have a standalone system that gives you a RS 232
output with 1 E 12 resolution in 1 second, the PIC has 0.1, 1,
I have both, but the HP is bigger than a breadbox. Way bigger. ;-)
You don't know at how many used ones I saw before I found one with the pods!
The deal with Rigol is expectations (at least mine) are low, so when it works,
yippie.
I'm not so sure I'd want the Rigol to be my only scope. But I
I would agree that a DSO with a peak detect mode is the way to go for
general purpose work. I just wish the cheap ones had delayed sweep
and faster waveform acquisition rates instead of long record lengths.
When I was diagnosing an offline switching power supply a few weeks
ago that was stuck in
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