On 04/20/2012 03:49 PM, ewkeh...@aol.com wrote:
It is a circuit that they for instance use in the 2110 where they take the
reference input in case of 10 MHz divide by 2 and also divide the 5 MHz
down to 500 Hz use an exor and out comes 5.000500 MHz filtered and divided by
5.
A similar
Moin
On Thu, 19 Apr 2012 18:18:24 -0400 (EDT)
ewkeh...@aol.com wrote:
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.
What is this Austron Circuit? And how does it look like? :-)
On Thu, 19 Apr 2012 23:39:32 +0200
skywatcher skywatc...@web.de wrote:
BTW i'm using the
Parallax 'Propeller' controller
which has 8 cores running at 80 MHz each, and can measure time intervals
with 12.5 ns resolution.
[...]
Looks like an interesting thing. But also very specialized.
If
Attila Kinali wrote:
On Thu, 19 Apr 2012 23:39:32 +0200
skywatcherskywatc...@web.de wrote:
BTW i'm using the
Parallax 'Propeller' controller
which has 8 cores running at 80 MHz each, and can measure time intervals
with 12.5 ns resolution.
[...]
Looks like an interesting thing.
It is a circuit that they for instance use in the 2110 where they take the
reference input in case of 10 MHz divide by 2 and also divide the 5 MHz
down to 500 Hz use an exor and out comes 5.000500 MHz filtered and divided by
5. The result is 1.000100 MHz which is mixed with the unknown
You may want to look at how that was done many years ago with
frequency difference multiplication as in the old Tracor meters - I
think the 528 was the main one. They synthesized a 9 MHz reference
from one input, and then subtracted it from the other to get a 1 MHz
result, which was used as a
I have and use a Tracor 527E how ever the Austron circuit including counter
is a PCB board 2.2 X 2.5 inches and I have not seen a Tracor for $ 50. I
think I paid $ 800 fifteen years ago.
Bert Kehren
In a message dated 4/20/2012 11:37:16 A.M. Eastern Daylight Time,
e...@telight.com
Ed
at one time I used two 9 GHz multiplier chains out of FTS 4000's mixed
them, if you are interested contact me off list I may still have them. Have
thrown out many things because I am downsizing in preparation for a move.
Bert
In a message dated 4/20/2012 11:37:16 A.M. Eastern Daylight
Wolfgang asked
Does anybody know a possibility to get a resolution 1 mHz ? (in 1 second)
The goal is look for frequency deviations caused by external influences ...
A silly question to ask time nuts. :)
How good do you really want it to be?
1 mHz out of 10 MHz in one second is only 1 part in
On 2012/04/20 13:44, time-nuts-requ...@febo.com wrote:
For a high end example showing external influences causing small freq
variation, see the swinging OSC test at
http://www.thegleam.com/ke5fx/tpll/swing.gif
Neat! Is there a page explaining a bit more about it?
I was summarizing the
No page. The effect is nothing very special. No relativity.
Mostly just the effect of the oscillator's G sensitivity caused by tilting
and acceleration as it swings.
What is generally measured with a 2 G static turn over test.
The thing about the test is that it gives a signal that is very
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
...@web.de
Sender: time-nuts-boun...@febo.com
Date: Thu, 19 Apr 2012 21:10:03
To: time-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: [time-nuts] Question about precise frequency / phase measurement
Hello @all,
my name is Wolfgang
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
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
and frequency measurement
time-nuts@febo.com
Date: 04/19/2012 03:38 PM
Subject:Re: [time-nuts] Question about precise frequency / phase
measurement
Sent by:time-nuts-boun...@febo.com
And, if you are measuring, by analog mixing, two very slightly
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,
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