You can see the Tracor frequency error meter, use the same mixer method you
describe but using 9 and 10 MHz frequency to mix toghetherand a decade
mfrequency multiplier. The limit of the system is the phase noise of the system
and sources. The Tracor use an optional Xtal filter to limit the
As does the Quartzlock A7-MX.
Using the CD4046 (or HC4046) as the phase locked oscillator would
probably be counterproductive as its phase noise is very high (its in
effect an RC oscillator with an effective Q of around1/4)
Bruce
Paramithiotti, Luciano Paolo S wrote:
You can see the Tracor
Hi
The normal term for a gizmo that multiplies and then mixes down is an error
multiplier. They were a very common lab item back when I had more hair than I
do now.. Various people made them in the 1950's and 1960's.
Bob
On Jan 10, 2011, at 9:35 PM, Perry Sandeen wrote:
List,
While
While sensitivity to g is an usually specified parameter for crystal
oscillators, I've been unable to find any indications for atomic clocks, say
5071A, or more modestly LPRO. Can anybody point me to any source of info on the
subject?
Thanks,
Antonio I8IOV
Suppose I want to make a GPSDO using the 1PPS output of generic GPS device
XYZ, what kind of accuracy should I be looking for?
I understand the concept of smaller error is better, but I lack the
practical experience and would like to get a handle on the actual numbers.
When a GPS devide XYZ
On Tue, Jan 11, 2011 at 8:14 AM, Tijd Dingen tijddin...@yahoo.com wrote:
When a GPS devide XYZ datasheet quotes a timing accuracy on the 1PPS
output of lets say 1 us RMS, would it be useful? I.e would /you/ consider
using it? What if it was 100 ns RMS on the 1pps? Or 10 ns RMS? Or ... At
Hi
There are three things people refer to as G sensitivity on a crystal
oscillator:
1) 2 g tip sensitivity (flip it 180 degrees on the bench).
2) Vibration sensitivity (vibration translates into phase noise)
3) Relativistic effects (take the oscillator to the moon and it's frequency
changes).
Hi
What is the desired goal?
It's a rare list member that has multiple parts to check that are in the
1.0 x 10^-13 at one second ADEV category. There are indeed a few that do,
for the rest of us, that's a pretty reasonable limit.
If my sources are at that point, a measurement system that does
Chris,
On 11/01/11 06:43, Chris Erickson wrote:
Would someone mind posting the manual for this? I have a dead one in the
closet that needs my attention and I'm not quite sure where to start. The
power supply works, but no other signs of life.
When I get around to scan it I will put it on my
While sensitivity to g is an usually specified parameter for crystal
oscillators, I've been unable to find any indications for atomic clocks, say
5071A, or more modestly LPRO. Can anybody point me to any source of info on the
subject?
Thanks,
Antonio I8IOV
Hi Antonio,
You may find some
Bob Camp wrote:
Hi
There are three things people refer to as G sensitivity on a crystal
oscillator:
1) 2 g tip sensitivity (flip it 180 degrees on the bench).
2) Vibration sensitivity (vibration translates into phase noise)
3) Relativistic effects (take the oscillator to the moon and it's
Magnus
Crazy question. Though the small rb references are difficult to disassemble
they can be. I believe I have seen what you describe. Might this technique
be used on those also. I have a flaky end of life old telco reference that I
would open up to try it on. Though no heat gun.
Does the RB
Hi Antonio:
Atomic clocks don't have a sensitivity to the direction of the
acceleration like a crystal. That's to say a crystal has planes and
the direction of the acceleration changes the crystal frequency. See
the plot at:
http://www.prc68.com/I/PRS10.shtml#Accel
The PRS10 was rotated so
Crazier question could it be baked in an oven or must you be able to
carefully visually watch it?
On Tue, Jan 11, 2011 at 1:53 PM, paul swed paulsw...@gmail.com wrote:
Magnus
Crazy question. Though the small rb references are difficult to disassemble
they can be. I believe I have seen what
FWIW, I have an FTS militarized Cesium that has an accelerometer as part of the
OCXO assembly to reduce vibration sensitivity. I'm told -- but can't document
-- that it was for the Navy and the idea was to counteract the effects of the
ship's guns. FTS engineers had a couple of PTTI articles
On 11/01/11 18:06, Chris Albertson wrote:
On Tue, Jan 11, 2011 at 8:14 AM, Tijd Dingentijddin...@yahoo.com wrote:
When a GPS devide XYZ datasheet quotes a timing accuracy on the 1PPS
output of lets say 1 us RMS, would it be useful? I.e would /you/ consider
using it? What if it was 100 ns RMS
Paul,
On 11/01/11 19:57, paul swed wrote:
Crazier question could it be baked in an oven or must you be able to
carefully visually watch it?
I guess you could do that if you only can oriented it there. However, I
just wanted to play a bit safe and not overheat it... and then I did
warm it up
List,
Wrote: However the exercise is probably pointless as the frequency difference
between the 2 signals as seen at the output of the cascaded divide and mix
chains are reduced by this scheme.
Umm. I guess I didn’t express my thoughts effectively enough.
The idea is to subtract 9 MHz in
Now that we are discussing how to restore Rb lamps.
Has anyone given any thought to refilling or refluxing the Cs in depleted Cs
tubes?
Obviously opening would require high vaccum equipment - which is a totally
separate category of nut (Or is it?)
Scott
Scott
Sent from my Verizon Wireless
Perry Sandeen wrote:
List,
Wrote: However the exercise is probably pointless as the frequency difference
between the 2 signals as seen at the output of the cascaded divide and mix
chains are reduced by this scheme.
Umm. I guess I didn’t express my thoughts effectively enough.
The idea is
On 11/01/11 06:43, Chris Erickson wrote:
Would someone mind posting the manual for this? I have a dead one in the
closet that needs my attention and I'm not quite sure where to start. The
power supply works, but no other signs of life.
I was just given this by a fellow time-nut:
I'm in need of a PLL too. Is there a common part that is better than
the 4046? I assume there must be.Not for high precision work.
Wrote: Using the CD4046 (or HC4046) as the phase locked oscillator would
probably be counterproductive as its phase noise is very high (its in effect
an RC
On 12/01/11 01:06, scmcgr...@gmail.com wrote:
Now that we are discussing how to restore Rb lamps.
Has anyone given any thought to refilling or refluxing the Cs in depleted Cs
tubes?
As it has been pointed out before, the failure of a tube may be from any
number of issues, including the
I have a CS tube that has a 'rattle'. I suspect one of the magnets has
become dislodged.
It would be nice to be able to 'reposition' the magnet if indeed that is the
problem.
I have thought about X-Raying it to see if I could see the problem.
Joe
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