Hi Jim,
On 22/02/14 14:17, Jimmy Burrell wrote:
I need some help with a 'noob' question regarding some practical examples in
some of the NIST literature. When attempting to compare two clocks, I'm a bit
confused on the subject of exactly how to use my counter to compare a delayed
clock
Hi Jim,
On 23/02/14 01:10, Jimmy D. Burrell wrote:
Hmmm... Magnus thank you for your comments. The 5 ns figure is certainly helpful. My 1980
manual from HP just says Time Interval A - B = 0 ns to 10E7 seconds. Not
very helpful.
May I ask where you found your 1992 reference? Perhaps you have
On 28/02/14 22:51, Poul-Henning Kamp wrote:
A long time ago, I found out that the HP5370 is quite sensitive to
qualities of the external reference signal and after playing around
with it a bit, I decided to run my HP5370 from its own OCXO since
that was both reproducible and eliminated what I
On 01/03/14 00:06, Poul-Henning Kamp wrote:
In message 53110bc6.6010...@rubidium.dyndns.org, Magnus Danielson writes:
Also, as I have told before the board doing the 10 MHz logic spews out a
lot of 5 MHz with overtones, which is a simple mod away.
I remember you mentioning this, but I never
On 28/02/14 04:50, John Seamons wrote:
On Feb 28, 2014, at 4:34 PM, Bob Camp li...@rtty.us wrote:
Is there any performance data on how the card does with a 5370A and / or a
5370B compared to the original CPU on the exact same box? Put another way -
does the counter get better or worse with
On 28/02/14 14:18, Poul-Henning Kamp wrote:
In message 87caf1a2-d281-4331-b019-b01b06f11...@rtty.us, Bob Camp writes:
To me the next layer here is to see if the basic accuracy of the device
can be improved in software.
I have a hard time seeing how that would happen.
I think one of the best
On 28/02/14 18:42, Tom Van Baak wrote:
I think one of the best chances would be to improve the phase
noise of the 200MHz signal.
But don't miss the fact that being able to make a LOT more measurements
in the same time also improves noise statistically.
I agree with this. And it makes me
On 01/03/14 11:31, Poul-Henning Kamp wrote:
In message 5311b3eb.1000...@rubidium.dyndns.org, Magnus Danielson writes:
What one possibly could do is to see if there is any round-off issues
that causes any noise.
The HP5370 firmware uses floating point to avoid exactly that issue,
and all
On 01/03/14 01:47, Bob Camp wrote:
Hi
There is a fairly involved alignment process for the multiplier chain. My
*guess* is that small tweaks to the alignment could impact these timing spikes.
Sub harmonics tend to produce multiple zero crossings that show up as periodic
jitter in the output.
Volker,
On 01/03/14 12:15, Volker Esper wrote:
Hello dear fellow time-nuts,
I stumbled over a question that may sound stupid to you:
Is the usual ADEV plot the result of a phase or a frequency measurement?
I get totally different results when comparing a phase and a frequency
measurement of
On 26/02/14 17:09, Bob Stewart wrote:
I've been experimenting with digital thermal compensation on my GPSDO. The
results have been favorable for a 14 bit dithered PWM-based DAC, but leaves a
bit to be desired in the big picture. And it takes up a lot of program bytes
on my PIC.. What's the
On 01/03/14 13:25, Volker Esper wrote:
Thank you, Tom, so far. Yes, I know that I have to use different
formulas, but - of course - I didn't calculate the ADEV curves myself, I
let some software do the job, namely Ulrich's Plotter and TimeLab as
well. Plotter has a menu item, where you have to
On 24/02/14 19:14, Paul Berger wrote:
A couple further observations, to make life easier when adjusting C245
you can unplug the top card and move it aside, the CVXO will lock
without it, but you will not have the 10MHz to monitor, but you can
monitor the CVXO output instead. On the 6 pin
Hi Bert,
On 14/02/14 17:55, ewkeh...@aol.com wrote:
Attached the innards of a FTS 2000A. The unit obviously does not have a
thermal fuse. Solder had melted and the XTAL was loose inside. Do not know
what happened since I got it that way
Bert Kehren
Thanks for sharing!
I rarely say it, but
Hi Bob,
On 01/03/14 16:55, Bob Camp wrote:
Hi
I am not at all sure that a mid setting on the VCXO is really the right thing
to do.
It's not really the right thing to do. You should trim it to one end so
that further continuous drift makes trimming time longer than putting it
at the mid.
On 01/03/14 18:20, Brian Lloyd wrote:
Instead of using the external reference input, any thoughts on actually
disciplining the internal OCXO to bypass the problem?
Considering that it's a HP10811A, it shouln't be too hard.
In general, doing a new A8 board might be an option.
Cheers,
Magnus
Hej Lars,
Impressive build in all it's simplicity.
Your filtering equations look strange.
Rather than having a PI loop it looks like both the P and I branch
integrates. I'm also unclear about the loop gain changes by the
pre-filter averager.
Will have to look more at your code.
Cheers,
Hej Lars,
On 01/03/14 23:09, Lars Walenius wrote:
Hi Magnus
You are correct in a way. The code is more complicated than it should have
been.
Well, there is potential for improvements.
The first row with comment “corr for time” is the I-term.
OK.
The second row that integrates the
Hi,
Internally you typically run a 1 ms frame on everything. You integrate a
cycle of C/A code on each channel, sample state on all channels with the
1 ms clock and the solution will disclose the time-error of that 1 ms
clock so knowing how a 1 PPS relates to the 1 ms clock is fairly
On 01/03/14 22:38, Poul-Henning Kamp wrote:
In message CAE3hgTd5UDz_-T5mvgBarYYyuLwn=+00p1fho2fs+t1p1xd...@mail.gmail.com
, Brian Lloyd writes:
Instead of using the external reference input, any thoughts on actually
disciplining the internal OCXO to bypass the problem?
The end result would
Hi Bert,
I guess you said something unprintable.
Cheers,
Magnus
On 01/03/14 23:05, ewkeh...@aol.com wrote:
Hi Magnus
That is not what I said.
Bert
In a message dated 3/1/2014 10:39:30 A.M. Eastern Standard Time,
mag...@rubidium.dyndns.org writes:
Hi Bert,
On 14/02/14 17:55,
On 02/03/14 21:45, Bob Camp wrote:
Hi
The gotcha is that there are second order temperature effects. If you are going
to run the crystal very far off turn, you need to keep it more stable than you
might think.
hysteresis, memory effect, restart of frequency drift
Yeah, it puts a limit on
Hi Bob,
On 02/03/14 23:16, Bob Camp wrote:
HI
On Mar 2, 2014, at 4:00 PM, Magnus Danielson mag...@rubidium.dyndns.org wrote:
On 02/03/14 21:45, Bob Camp wrote:
Hi
The gotcha is that there are second order temperature effects. If you are going
to run the crystal very far off turn, you
Hi Poul-Henning,
On 02/03/14 23:29, Poul-Henning Kamp wrote:
I have spent another evening playing around with the 5370 and the
conclusion is pretty ironclad now:
Running a 5370 with ext-ref locked to input frequencies is simply
a bad idea and should not be done.
Running it on the internal
On 03/03/14 14:14, Bob Camp wrote:
Hi
*IF* I understand the plot (and that’s a big if, it’s early and I’ve had
limited coffee): The period is shifting with phase. We trust the 3336 to be on
frequency. The likely answer is that the trigger point must be changing. The
question is whether it’s
Hi Poul-Henning,
On 03/03/14 14:41, Poul-Henning Kamp wrote:
In message c542adee-19dd-4dab-a1bf-fb842c077...@rtty.us, Bob Camp writes:
The likely answer is that the trigger point must be changing.
Yes that would be my first theory as well.
Cross-talk and ground-bounce through common
On 03/03/14 16:16, Daniel Mendes wrote:
Uncorrelated noise improves resolution in certain systems, even
mechanical ones... it´s called dither:
http://en.wikipedia.org/wiki/Dither
... as used in the HP5328A with option 40.
Got it. :)
PS. Still wish I had the GPIB for it.
Cheers,
Magnus
Volker,
On 03/03/14 00:50, Volker Esper wrote:
Sorry for the time delay...
TIC: SR620 with Z3805 as external reference; signal source
Nortel/Trimble GPSTM (GPSDO) 10MHz output
Enclosed two plots (SW: Plotter):
- one is sigma(tau) calculated from phase samples (SR620 TIME mode),
- the other
On 03/03/14 22:35, Poul-Henning Kamp wrote:
In message 5314ef87.1020...@rubidium.dyndns.org, Magnus Danielson writes:
Got a HP3325B, HP5370B/C/D but also 5359A and SR535.
Another approach is to set a rubidium for a *slow* scan over
phase-relationships.
Hmm, I have a 5359A as well, I din't
On 03/03/14 14:23, Bill Riches wrote:
Wildwood is up as of 1300 Z March 3, 2014. We are in the middle of a lot of
snow! Estimated to receive a foot or so. Yippie...
Just don't blame LORAN for the snow. A LORAN tower will sure be far more
than a foot or so.
Good signal?
Cheers,
Magnus
On 03/03/14 23:59, Poul-Henning Kamp wrote:
In message 531505bc.4050...@rubidium.dyndns.org, Magnus Danielson writes:
On 03/03/14 22:35, Poul-Henning Kamp wrote:
In message 5314ef87.1020...@rubidium.dyndns.org, Magnus Danielson writes:
Indeed. Let's assume that it's not the BBB causing
Hi,
Agree. If you steer so you keep to be off frequency so you have plenty
of sawtooth you get better resolution. I've been pondering about maybe
write an article to illustrate the effect.
Cheers,
Magnus
On 04/03/14 23:45, Bob Camp wrote:
Hi
Be careful of what you wish for.
One way to
Hi,
You still get hanging bridges, but smaller in amplitude and for the same
oscillator stability much more short-lived.
Cheers,
Magnus
On 06/03/14 00:03, Bob Camp wrote:
Hi
If you are going to decode and use the sawtooth data out of the receiver,
there’s no need to eliminate the hanging
On 07/03/14 19:28, Lars Walenius wrote:
Chris, about using one Arduino for two GPSDO controllers:
Even if a microcontroller has lots of capacity I would recommend to use
separate controllers for each oscillator. One of the reasons is what Tom van
Baak said about using only one interrupt to
On 08/03/14 00:52, Bob Camp wrote:
Hi
With a “real” 12 to 13 bit ADC and a 200 ns TDC pulse you would ideally get
200 / 4096 as your LSB. Nothing like this is ever perfect, so you probably aren’t
going to get 50 ps. You probably will be below 100 ps. That’s plenty good enough
to make
Tom,
On 04/03/14 01:40, Tom Van Baak wrote:
Has anyone used the binary dump feature of the SR620 (command BDMP) or the
x1000 feature (command EXPD)?
If you have, please send me email off-list.
If you haven't, I will post a report to time-nuts later this week.
You make me curious. Any
Hi Tom,
On 08/03/14 22:12, Tom Van Baak wrote:
You make me curious. Any specific issue you're having?
I haven't tried doing any programming to the SR620 yet, but I have some
plans to do it.
Cheers,
Magnus
Hi Magnus,
Thanks for asking. Here's an update.
I was curious why time interval or
On 04/03/14 01:05, Volker Esper wrote:
Am 03.03.2014 23:04, schrieb Magnus Danielson:
Volker,
On 03/03/14 00:50, Volker Esper wrote:
Sorry for the time delay...
TIC: SR620 with Z3805 as external reference; signal source
Nortel/Trimble GPSTM (GPSDO) 10MHz output
Enclosed two plots (SW
On 09/03/14 22:36, Volker Esper wrote:
Am 09.03.2014 19:46, schrieb Magnus Danielson:
On 04/03/14 01:05, Volker Esper wrote:
Am 03.03.2014 23:04, schrieb Magnus Danielson:
Volker,
On 03/03/14 00:50, Volker Esper wrote:
Sorry for the time delay...
TIC: SR620 with Z3805 as external reference
On 10/03/14 16:33, Anders Time wrote:
A while a go i bought some low phase noise Crystek CVHD-950 and now I want
to meas the phase noise of the oscillators.
Is it best to try to impedance match the output signal and filter and
amplify the hcmos before i feed it in to the phase detector? or Just
On 12/03/14 10:57, Anders Time wrote:
Thanks a lot for the input!
I will try to use the LMH6702 as buffer.
The correct way to measure the HCMOS oscillator would probably be to use a
high impedance buffer with very low noise, to simulate driving a 10pF load
or so. But I guess that is not easy to
Tom,
On 18/11/13 23:15, Tom Van Baak wrote:
Magnus,
I'm going to push back a bit on your mains sampling claim. Mostly, I'd like to
see the results of the professional I-Q demodulated gear that you mentioned.
Can you post raw data, or a sample plot?
I don't have much of that myself. I do
Hi Tom,
On 12/03/14 18:15, Tom Knox wrote:
So we know there are deviations in line freq. But it seems strange in
this era of very accurate and inexpensive freq references.
May seem strange, yes.
How much is related to the generation? It seems in this era of
switching supplies and other
Bob,
On 12/03/14 18:24, Bob Stewart wrote:
Now that I've got the TIC going, I'm working on the PLL math
for my GPSDO. My question is about moving averages. I've
put in a moving average for the TIC. From that, I've
calculated the slope, and have put a moving average on the
slope to settle it
Hi Bob,
On 12/03/14 19:26, Bob Stewart wrote:
Hi Magnus,
Thanks very much for this response! It will be very easy to add the
exponential averager to my code and do a comparison to the moving average. I
have no experience with PI/PID. I'll have to look over the literature I have
on them
On 12/03/14 20:25, Hal Murray wrote:
mag...@rubidium.dyndns.org said:
Exponential averger takes much less memory. Consider this code:
x_avg = x_avg + (x - x_avg) * a_avg;
Where a_avg is the time-constant control parameter.
Also note that if a_avg is a power of 2, you can do it all with
Hi Bob,
On 12/03/14 23:16, Bob Stewart wrote:
x_avg = x_avg + (x - x_avg) * a_avg;
Hi again Magnus,
In fact, I just post-processed some data using that formula in perl. It looks
great, and will indeed save me code and memory space. And, it can be a user
variable, rather than hard-coded.
On 13/03/14 07:35, Daniel Mendes wrote:
Em 13/03/2014 01:35, Bob Stewart escreveu:
Hi Daniel,
re: FIR vs IIR
I'm not a DSP professional, though I do have an old Smiths, and I've
read some of it. So, could you give me some idea what the FIR vs IIR
question means on a practical level for this
On 13/03/14 13:57, Jim Lux wrote:
On 3/12/14 10:06 PM, Chris Albertson wrote:
On Wed, Mar 12, 2014 at 9:13 PM, Daniel Mendes dmend...@gmail.com
wrote:
This is a FIR x IIR question...
moving average = FIR filter with all N coeficients equalling 1/N
exponential average = using a simple rule to
On 14/03/14 00:39, Bob Camp wrote:
Hi
Either grab a math pack (there are several for the PIC) or go to C.
Timing at the Time Nuts level is about precision. We need *lots* of digits past
the binary point :)
Indeed. Throwing bits at the problems is relatively cheap today.
Besides, you don't
On 13/03/14 22:11, Tom Van Baak (lab) wrote:
Do you have a photo? I have a large collection of hp oscillators here and do
not see a 10544 with SMB. Are you sure it's not 10811?
Then again, there are 10544A s/n 1528Ax mounted on a 15-pin PCB
(05238-20027) which has a SMB connector.
That
On 22/03/14 09:01, Poul-Henning Kamp wrote:
In message 532d1009.6040...@leikhim.com, Joe Leikhim writes:
In retrospect it is kind of crazy that fleet owners will put
tracking devices on $100K semi trucks and cranes yet $100 million
aircraft have to rely upon 60 year old technology
On 22/03/14 13:17, Tom Van Baak wrote:
What's the best way to make an ADEV plot, other then using time lab?
Timelab appears to be an MS Windows .exe file.I could write a
script based on the definition of adev but I bet someone has already
done this.
Chris,
John's TimeLab gives you much
Claude,
On 22/03/14 12:48, Claude Fender wrote:
Hi,
I have two generators 3324A and 33120A and one counter 5334B. All the
instruments are locked to a GPSDO.
I've measures a 1 kHz output of the generators with the counter set with a
gate time of 1 second, and repeated the measure 3600
On 22/03/14 19:56, John Ackermann wrote:
We discontinued selling kits for the TAPR TADD-1 distribution amplifier
a couple of years ago when the MAX477 amplifier at the heard of the
design became unobtanium. There were reports that the Analog Devices
AD8055 was a drop-in replacement, but I
Hi Tom,
On 22/03/14 21:00, Tom Van Baak wrote:
Hi Chris,
I'm pretty sure John distributes complete source code to TimeLab as part of the
installation.
My source code is at www.leapsecond.com/tools
There are also many open source plotting tools available.
Not sure what you're complaining
On 22/03/14 21:19, Chris Albertson wrote:
Can you imagine how much an aircraft like that is worth in spare parts alone?
It is worth more as scrap metal.
There is no market for untraced spare parts for large passenger jets.
I was just going to say the same thing. Selling parts from a stolen
On 22/03/14 22:13, Magnus Danielson wrote:
Hi Tom,
On 22/03/14 21:00, Tom Van Baak wrote:
Hi Chris,
I'm pretty sure John distributes complete source code to TimeLab as
part of the installation.
My source code is at www.leapsecond.com/tools
There are also many open source plotting tools
On 23/03/14 02:06, Magnus Danielson wrote:
Hi
As follow-up on the previous message, where I varied the TIC resolution,
let's vary the TIC averaging for the TIC resolution of 100 ns, which we
know has some effect. The default TIC averaging is for 100 s, so I
varied it for 1, 10, 100 and 1000 s
On 23/03/14 06:56, Said Jackson wrote:
Tom,
In my experience one of the biggest GPSDO error sources in low-cost and even
some higher end OCXOs is oscillator hysteresis. Which can change with operating
temperature, operating time (crystal age) and even over crystal tilt.
Does your OCXO model
On 23/03/14 14:02, Bob Camp wrote:
Hi
The real answer is always “that depends”.
1) How much does the sensitivity of your OCXO change with a change in EFC?
1.4:1, 2:1, 4:1 …. (slope sensitivity not % linearity)
2) How quiet is your DAC compared to your OCXO?
3) How quiet is your reference
On 24/03/14 00:08, Charles Steinmetz wrote:
Chris wrote:
4) why use a PPS as the communications link from GPS to GPSDO?
Generally, because that is the only precision timing output you get from
a GPS unit. The models with a 10kHz output were prized by the simple
GPSDO crowd precisely for the
Jim,
On 23/03/14 16:00, Jim Miller wrote:
To handle higher tau performance I think we want a higher degree loop.
Cheers,
Magnus
Is a higher degree loop possible while maintaining stability? Commanding
frequency while measuring phase is one pole, integrating the result of the
phase
Jason,
On 23/03/14 17:26, Jason Rabel wrote:
NTP is best used over the Internet. It was designed for unreliable data links.
In the quest for expansion of NTP over the internet, one thing has always
nagged me.
You can find lists of servers and they will give a physical location along with
On 24/03/14 07:12, Hal Murray wrote:
mag...@rubidium.dyndns.org said:
I did a temporary hack on the PID code to convert the D-term into I^2 term,
by integrating the integrator output. First attempt was indeed quite
resonant just to show that I was in the unsafe region. Backing down on the
On 26/03/14 22:42, Tom Van Baak wrote:
Did some home-work on third-degree PLL parameters, so now I know why I
failed, as I never tried to do it right.
One thing that Tom's simulator isn't doing is calculating the parameters
for the PID for you, or backwards what characteristics you will get.
Fellow time-nuts,
Every now and then, a customer runs into trouble. You end up in these
meetings where vendor and customers discuss troubles. I heard about this
one and invited myself along. Turns out my friends at the customer was
attending. Troubles involved dropouts and blips on a
On 28/03/14 04:47, Mark Sims wrote:
no, No, NO granite! Granite tends to be rather radioactive (particularly avoid
the pink stuff). Any audiofool worth his tin ears can't have no stinkin'
alpha/beta/gamma particles mucking with his music!
In that case you don't want a Rubidium clock in
On 28/03/14 12:33, Bob Camp wrote:
Hi
Crystals are susceptible to vibration. That’s pretty well documented. They have
resonances in the mount structure. They have a 2G tip sensitivity.
Audio when it “impacts” an oscillator induces vibration. If your noise source
is a rocket engine, then the
On 30/03/14 00:01, djl wrote:
granite is not only radioactive, but also piezoelectric.
Ah, granite resontator? :)
Will have to try the resonator mode of the granite slab I have in the
(kitchen) oven. :)
Cheers,
Magnus
___
time-nuts mailing list
On 10/04/14 23:48, Bob Stewart wrote:
My Adafruit has gone walkabout again. This is a different unit than the one I spoke
about some months ago. It's been about 150 ft from my actual location, which has, of
course, made a mess of my GPSDO. Well, at least it verified my unlock code.
I did
On 10/04/14 00:38, Hal Murray wrote:
I've been watching the discussions and graphs for a while. ADEV seems
appropriate for cases where the noise pattern is nice. How does ADEV work
if the noise isn't nice? Are there alternatives? What's the mathematical
term for the type of noise that works
On 10/04/14 19:24, Richard (Rick) Karlquist wrote:
The trouble with ADEV is that if you average
a long time it papers over anomalous events
like crystal jumps.
ADEV is about characterizing noise powers. The better variants such as
TOTADEV and TheoADEV will be even more efficient at
On 11/04/14 22:15, Dan Kemppainen wrote:
Hi all,
I'm thinking about an upcoming project, if this is off topic please
disregard or contact me off list. :)
I have a large LC tank, with a very lossy inductor. Being driven by a
pulse width push pull driver, that is digitally controlled. The driver
Hi,
On 10/04/14 06:43, Tom Van Baak wrote:
You are right in the I don't even need data cycles. All I want is the
error which is 5,000,000 minus the count. this is hopefully zero.
Correct. Keep the counter running. No need to zero it, ever. Use differential
measurements. Essentially you are
On 12/04/14 18:37, Ronald Held wrote:
A CSAC does not use magnetic field as a Cs primary frequency standard
does, AFAIK.
http://scpnt.stanford.edu/pnt/PNT11/2011_presentation_files/18_Lutwak-PNT2011.pdf
See page 20 where the C-field coil is depicted.
I was quite sure it was there.
Cheers,
Warren,
On 12/04/14 21:09, WarrenS wrote:
Magnus
Interesting, Am I missing something or is there an error in your code or
logic.
Looks to me like the code is a PI controller with a added D term
(Vdf) of input,
and the D is then Integrated with a scale factor of F at Vi = Vi +
F*Vdf ...
An
On 12/04/14 21:23, d...@irtelemetrics.com wrote:
Magnus,
You are very much on the track that I was thinking. I belive you are
absolutly correct
in that a 90 degree phase shift would be ideal.
I did a bit more digging last night, and it turns out that an XOR phase
comparator
looking at the
On 11/04/14 15:33, Tom Van Baak wrote:
Brooke, Ulrich,
Keep in mind the hp SmartClock product line dated from the early-90's and it was one of
the first GPSDO on the market. So even simple things like using timing receivers, partial
ionospheric correction, sawtooth correction, sub-ns TIC,
On 11/04/14 21:38, Chris Albertson wrote:
Look at what NTP does to select good clocks when it has many to choose
from. It does not simply average them.
It looks at the noise in each one and then sees which clocks have
overlapping error bars. It assumes that all good clocks have the same time
Warren,
On 13/04/14 07:44, WarrenS wrote:
Magnus wrote
It may appear so, but the derivate, scale-factor F and integrate does not
make the scale-factor F equalent to P, since you are forgetting that the
derivate removes the DC term
We don't quite agree on that point yet.
I can not find
Warren,
On 13/04/14 19:24, WarrenS wrote:
Magnus wrote
You are over-focusing ...
At least on that we totally agree.
The same can be said of you in over-focusing on what comes before the
Phase error term Vdp. The PI code we've been discussing does not care.
Can we just focus to see if you
Hi,
On 04/17/2014 04:54 AM, HagaaarTheHorrible wrote:
Hello there,
I tried searching the archives (and google, IEEE, NIST, ITU), but didn't really
find a satisfying answer, so I thought I'd ask directly.
In short:
Is there any kind of standard definition for Jitter which is commonly
On 04/18/2014 07:45 PM, Andrea Baldoni wrote:
On Fri, Apr 18, 2014 at 07:17:17PM +0200, Andrea Baldoni wrote:
I own a Racal-Dana 1995 than can count periods to 1700s, but can't be used
as event counter and the inputs are delicate, needing care and attenuators.
I just remembered that the
Hi,
On 04/18/2014 03:17 PM, HagaaarTheHorrible wrote:
Hi Dave and thanks for the quick answer!
My thesis is about a phase noise measurement device I developed, which primary
use is to measure phase noise/jitter of audioband DACs. I probably won't be
focussing on jitter too much but would like
They are found in the printed manual.
Speaking of which, I need a antenna setup for mine.
Cheers,
Magnus
On 04/20/2014 12:03 AM, gandal...@aol.com wrote:
I have a manual for the Stanford Research FS700 but it's lacking the
schematics, and so far I've been unable to find them.
I anyone has
Nigel,
On 04/20/2014 03:43 PM, gandal...@aol.com wrote:
Hi Magnus
Thanks for the reply.
I was aware of that, and the $35 previously mentioned in the time-nuts
archives for an original manual from SRS doesn't sound too bad, but they don't
seem to list the FS700 these days and for some other
Hi Corby,
On 04/20/2014 07:35 PM, cdel...@juno.com wrote:
After reading about how the BVA oscillators avoid the problems of on
crystal electrodes I was wondering if anyone has tried to optically
excite a quartz crystal in an oscillator?
(Use a modulated laser to drive the bare crystal, and a
Quartz is piezoelectric, so it deforms due to electrostatic fields and
vice versa. This is exactly what is being used in quartz oscillators.
For the BVA, the resonator is hanging in bridges of the same quartz
crystal it is being cut out from, and the orientation of the blank is
such that these
On 04/21/2014 11:40 AM, Attila Kinali wrote:
On Mon, 21 Apr 2014 17:12:54 +1200
Bruce Griffiths bruce.griffi...@xtra.co.nz wrote:
Optical excitation of quartz resonators: Electronics Letters
http://digital-library.theiet.org/content/journals/el, Volume 18,
Issue 9
On 04/21/2014 03:18 PM, Attila Kinali wrote:
On Mon, 21 Apr 2014 14:54:12 +0200
Magnus Danielson mag...@rubidium.dyndns.org wrote:
They used a 10mW HeNe laser, modulated with 1kHz to 1MHz on
various quartz cuts (X+5°, DT, AT) and could measure oscillations
of the quartz using metal
Bob,
We all start somewhere.
Today one buys aged equipment with fancy synthesis so that fooling
around with crystals, etching or graphiting them won't be necessary.
Hell, someone taking the time to calibrate their transceiver is rare
these days.
Cheers,
Magnus
On 04/24/2014 10:41 AM, sg sg wrote:
Hi,
I'm about to implement a PLL for a 24.576 MHz VCXO using the phase-frequency
detector (PC2) of the NXP 74HCT9046A. From the datasheet
(www.nxp.com/documents/data_sheet/74HCT9046A.pdf) it is not clear to me what
the maximum operating frequency for
Said,
I recognize this situation so well. Feel with you on the issue and hope
you find that it resolve itself nicely.
Cheers,
Magnus
On 04/24/2014 10:50 PM, saidj...@aol.com wrote:
Hello everyone,
let me address the below claims and commentary which was posted without
first consulting with
Jim,
On 04/25/2014 05:32 AM, Jim Lux wrote:
On 4/24/14, 6:26 PM, Said Jackson wrote:
Hi Magnus, Bob,
Thanks much for your kind words.
The failure rate is thankfully so low that we are not greatly alarmed,
and Microsemi has been a champ in resolving any failures with/for us
when they did show
On 04/25/2014 08:14 AM, Attila Kinali wrote:
On Fri, 25 Apr 2014 08:33:06 +0300
MailLists li...@medesign.ro wrote:
The recently acquired cash cow isn't working exactly as
expected/advertised. We still don't have a clue when/if the fundamental
(as in physics laws) design (we can't officially
On 04/25/2014 10:30 PM, Tom Van Baak wrote:
Hi Everyone,
I'm newer to this forum but I really enjoy reading the discussions. I have
a pretty basic question.
I'm wondering why one would chose an Rb Oscillator over a traditional OCXO?
It does not immediately appear there is a phase noise
On 04/25/2014 06:04 PM, Attila Kinali wrote:
On Fri, 25 Apr 2014 08:42:16 -0700
Chris Albertson albertson.ch...@gmail.com wrote:
You best bet is to change out the antenna. You can buy them with a higher
built-in gain up to about 40dB.
Buying a better antenna is also on the list. But i
On 04/25/2014 06:21 PM, gandal...@aol.com wrote:
Coincidentally, I came across this earlier today when looking for some
MMIC data, perhaps it might be worth a look?...
http://lna4all.blogspot.co.uk/
This is the 0,5 dB NF amplifier from Minicircuits and I think it is an
interesting
On 04/25/2014 08:19 PM, Björn Gabrielsson wrote:
On Fri, 25 Apr 2014 12:21:04 -0400 (EDT)
gandal...@aol.com wrote:
Coincidentally, I came across this earlier today when looking for some
MMIC data, perhaps it might be worth a look?...
http://lna4all.blogspot.co.uk/
Now that's
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