There's a great series of videos from a clockmaker on youtube and his own
site:
http://clickspring.weebly.com/
These are probably the best produced how-to videos I've seen on youtube on
any subject. Highly recommended.
Matt
On Wed, Apr 22, 2015 at 3:57 PM, Bob Camp kb...@n1k.org wrote:
Interesting work. They measured the before and after signals with
2 very different oscilloscopes one with 100 MHz BW and one with 500
MHz, which they shouldn't trust.. I guess they only had 2 2-channel
scopes in their lab.
Matt
On Sun, Apr 11, 2010 at 5:27 AM, Magnus Danielson
Thanks to everyone for their advice. I bought a CoolRunner II
development board (only $39!) and will let you know how it goes.
Matt
On Wed, Feb 3, 2010 at 10:59 AM, Matt Ettus boysc...@gmail.com wrote:
Does anyone have any experience using CPLDs for very low phase noise
dividers? You can get
Does anyone have any experience using CPLDs for very low phase noise
dividers? You can get an XC9536XL from Xilinx for around $1, and I
thought it would make a good divide by 2 through 10 device.
Matt
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, 2009 at 3:53 PM, Matt Ettus boysc...@gmail.com wrote:
We don't use the NI stuff at all. We have our own
SCPI-over-GPIB-over-VXI11-over-TCP/IP code all in python, based around
some code off of sourceforge. We use it exclusively with the E5810A
which is great. It also works with the Prologix
I'm not sure if the programming is the same, but we use a couple of
the E5810A and love it. We have full python code for using it if that
is of use.
Matt
On Tue, Sep 1, 2009 at 10:32 AM, Adrianrfn...@arcor.de wrote:
Ulrich,
thanks for your reply.
I have installed the I/O libraries suite
-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Matt Ettus
Sent: Tuesday, September 01, 2009 7:14 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] HP E2050A LAN/HPIB Gateway
have full python code
On Thu, Jul 30, 2009 at 10:17 PM, Tom Van Baakt...@leapsecond.com wrote:
Does anyone have a good solution for monitoring 4-8 different voltages
at the same time? I only need a sample rate around 1-2 Hz, but would
need GPIB, serial, or ethernet support with protocol documentation.
Any help
Does anyone have a good solution for monitoring 4-8 different voltages
at the same time? I only need a sample rate around 1-2 Hz, but would
need GPIB, serial, or ethernet support with protocol documentation.
Any help identifying a solution other than 8 voltmeters would be much
appreciated.
DC, 0 to 6V, 10mV or better resolution.
Thanks,
Matt
On Thu, Jul 30, 2009 at 9:08 PM, WB6BNQwb6...@cox.net wrote:
Hi Matt,
1. Is the voltage AC or DC ?
2. What is the voltage range ?
3. What kind of resolution ?
BillWB6BNQ
Matt Ettus wrote:
Does anyone have a good
[mailto:time-nuts-boun...@febo.com]on
Behalf Of Matt Ettus
Sent: Thursday, July 30, 2009 9:19 PM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Multiple Voltage monitoring
DC, 0 to 6V, 10mV or better resolution.
Thanks,
Matt
On Thu, Jul 30, 2009 at 9:08 PM
Has anyone used the National Instruments WLS-92xx or ENET-92xx
ethernet- and wireless-based data acquisition systems? Have you been
able to use them without using NI software? Is their protocol
documented anywhere?
It's an interesting product family, with 802.11 or ethernet
interfaces, you can
Does anyone know if it is possible to use the HP4352A/B VCO/PLL
analyzers with signal generators other than the 8665A? What is
involved?
I have a sig gen which is plenty good, so buying an 8665 just to go
with a 4352 (which you can now get for about $1K) seems like a waste.
Thanks,
Matt
:
Where can I get one for that price?
The Sig Gen phase noise is the driving spec since it needs to be better than
the phase noise of the VCO you are measuring.
Have Fun,
Brooke Clarke
http://www.prc68.com
Matt Ettus wrote:
Does anyone know if it is possible to use the HP4352A/B VCO/PLL
I am working with someone who needs to have time synchronized
reception of signals in various locations which are separated by less
than 100 km. This is a situation similar to VLBI, but since the
distances are shorter, the center frequencies are lower, and the
integration times are much shorter,
On Mon, Jan 5, 2009 at 12:13 PM, Lux, James P james.p@jpl.nasa.gov wrote:
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of Matt Ettus
Sent: Monday, January 05, 2009 11:31 AM
To: Discussion of precise time and frequency
On Mon, Jan 5, 2009 at 1:54 PM, Bruce Griffiths
bruce.griffi...@xtra.co.nz wrote:
If the application is somewhat analogous to VLBI, then the maximum
(uncorrectable ie random) allowable carrier frequency phase errors
between receivers depends on the integration time.
Maximum integration times
On Mon, Jan 5, 2009 at 2:56 PM, Lux, James P james.p@jpl.nasa.gov wrote:
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of Matt Ettus
Sent: Monday, January 05, 2009 2:28 PM
To: Discussion of precise time and frequency measurement
On Mon, Jan 5, 2009 at 3:02 PM, Bruce Griffiths
bruce.griffi...@xtra.co.nz wrote:
Matt
Matt Ettus wrote:
On Mon, Jan 5, 2009 at 1:54 PM, Bruce Griffiths
bruce.griffi...@xtra.co.nz wrote:
If the application is somewhat analogous to VLBI, then the maximum
(uncorrectable ie random) allowable
On Mon, Jan 5, 2009 at 9:27 PM, saidj...@aol.com wrote:
Hi Matt,
having 140ps matching of the 1PPS between units is the equivalent of knowing
your antenna position to within ~0.14 feet total error max.
Thats less than one inch error per antenna!
That makes it sound a lot more difficult
On Mon, Jan 5, 2009 at 10:59 PM, saidj...@aol.com wrote:
Hi Matt,
I must admit I don't fully understand your requirements. Are you looking for
correlation between errors, or absolute UTC accuracy, or short term
jitter/wander?
If you have two systems with self-surveyed antenna positions,
I just got a Mini Circuits power meter, the PWR-6G+, which is good to
6 GHz, -30 dBm to +20dBm. It hooks up by USB and is only $695. Very
cool device, and quite accurate from what I can tell. It's a nice
small package, just a sensor head with USB cable.
My only complaint is that I can't find
On my Oscilloquartz GPSDO, the 10 MHz output goes low at very close to
the same time as the 1 PPS output goes high.
On my Fury, the 10 MHz sine wave is just dropping off of its max high
voltage as the 1 PPS goes high. The 10 MHz CMOS output goes high just
shortly before the 1 PPS.
What do other
On Tue, Aug 5, 2008 at 10:38 AM, Prologix [EMAIL PROTECTED] wrote:
Hello,
Prologix is happy to announce its newest product - GPIB-LAN Controller.
Will there be VXI-11 support? The ICS 8065 and Agilent E5810A both
support it, along with most of the new test equipment that talks
ethernet.
In looking into extremely low phase noise synthesizers, I have come
across the new HMC700LP4 chip from hittite, which seems to have the
best figure of merit I have found, -227 dBm/Hz. That gives you
-107dBc/Hz at 20 kHz offset at 6 GHz according to the datasheets.
That sounds amazingly good, but
4, 2008 at 6:50 AM, Prologix [EMAIL PROTECTED] wrote:
Matt,
We are testing a fix. I'll be in touch soon.
Regards,
Abdul
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On
Behalf Of Matt Ettus
Sent: Wednesday, June 04, 2008 12:40 AM
To: Discussion of precise
A normal OCXO would drift significantly when being turned around in any
direction.
I've actually been wondering about what physical mechanism that causes
this. I could understand how it could cause a phase shift, but I
can't envision the cause of frequency shift. Does anyone know?
Matt
On Tue, Jun 3, 2008 at 5:31 PM, Prologix [EMAIL PROTECTED] wrote:
Short version:
Connect USB cable before connecting GPIB, and leave USB connected and
powered.
That isn't realistic for my setup.
Long version:
On startup, if one of the MCU I/O lines is pulled low, the controller will
enter
On Tue, Jun 3, 2008 at 5:03 PM, Prologix [EMAIL PROTECTED] wrote:
Hello Matt,
It appears your Prologix GPIB-USB controller is in firmware update mode.
Please follow these steps:
1. Disconnect USB cable and GPIB cable. If the controller is plugged onto an
instrument, unplug it.
2. Connect
On Mon, Apr 28, 2008 at 4:15 PM, Rick Karlquist [EMAIL PROTECTED] wrote:
I worked for Zeta Labs many years ago. This multiplier
undoubtedly has a step recovery diode that is being driven
at a level of a good watt or two. In most cases there was
a hefty transistor to make this power. You
Just bought a
Zeta Labs X76 Multiplier 7600 MHz Output Model 5856-01
on ebay. Anybody have any info on these? What kind of drive should I give it?
Thanks,
Matt
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fairly similar to the multiplier
in the well known brick frequency sources (California
Microwave, etc). Many people worked at both companies at
various times.
Rick Karlquist N6RK
Matt Ettus wrote:
Just bought a
Zeta Labs X76 Multiplier 7600 MHz Output Model 5856-01
On Mon, Mar 10, 2008 at 8:47 AM, Dan Rae [EMAIL PROTECTED] wrote:
David McGaw wrote:
Does anyone know of a source of push-button switches for the
Racal-Dana 1992? I have one that over half are bad. No luck from
Racal-Dana or their service house.
The original makers of that switch
Since a bunch of the switches on my 1992 are bad, I was going to buy
another to use for donor switches. However, I would also consider
getting a 1990, 1995, or 1996 if those had more features. Anybody
know the real differences from the 1992 to those other models?
Thanks,
Matt
On Tue, Mar 11, 2008 at 1:05 PM, Dan Rae [EMAIL PROTECTED] wrote:
[EMAIL PROTECTED] wrote:
Are these switches the same as the ones in the 1996? Mine works perfectly
now, but if the switches are a ticking time bomb, I'm going to move it to a
area with better temperature control, and start
I am trying to find a 100 MHz VCTCXO. The term VCTCXO doesn't seem to
be universal, so what I mean is a crystal oscillator which is voltage
tunable, but which without tuning is within about 10 or 20 ppm. Rakon
has parts on their website which fit the bill, but they don't seem to
actually make
Anybody ever used M1 Oscilloscope Tools from Amherst Systems?
http://www.amherst-systems.com/
It was pointed out to me today and it looks quite impressive. Is it worth it?
Thanks,
Matt
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Is there really anything in particular which is different about the
antenna requirements of timing receivers as compared to ordinary
high-quality receivers? The timing antennas seem to be in pointy
radomes, so that tells me they are probably quad-helixes rather than
patch antennas. How is that
On Feb 13, 2008 1:03 AM, Tom Van Baak [EMAIL PROTECTED] wrote:
To prevent, or at least detect, this effect I allow my 10 MHz
house reference to drift off-frequency by quite a bit (last
month it was 1.7e-12 off). That way there are no on-time
or on-frequency sources near the test setup.
Tom,
Are these any good?
http://www.oscilloquartz.com/index.php?pageid=37
Thanks,
Matt
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On Feb 11, 2008 2:19 PM, Bruce Griffiths [EMAIL PROTECTED] wrote:
Matt Ettus wrote:
Are these any good?
http://www.oscilloquartz.com/index.php?pageid=37
Thanks,
Matt
Matt
The OCXO frequency holdover performance at 1E-10/day is respectable.
The GPS receiver performance isnt
in 5345a.cpp to receive any data from
it.
-- john, KE5FX
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
Behalf Of Matt Ettus
Sent: Wednesday, January 30, 2008 5:25 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts
On Jan 21, 2008 11:44 AM, John Miles [EMAIL PROTECTED] wrote:
I am considering getting a new spectrum analyzer so I can make better
phase noise measurements than with my 8596E. I've looked at the 8566B
and the 8562 and 8563 since I need coverage to at least 6 GHz. The
8566 is huge and
I am seeing the following performance when measuring the built in 30
MHz reference:
100 Hz -81dBc
1 kHz-108 to -110
10 kHz -117
100 kHz -125
1 MHz-131
All of those are 3-8dB better than the spec, except for at 1 MHz where
the spec is -135. The measurements
Sure, send me the GPIB .PDF, either via Didier's site, ftp.ko4bb.com, user
manuals, password manuals) or via my GMail account at [EMAIL PROTECTED] It
looks like a great spectrum analyzer considering the prices they seem to
fetch on eBay. Should be a nice upgrade from the 8596E, all right.
On Jan 23, 2008 4:26 PM, John Miles [EMAIL PROTECTED] wrote:
Are you using a noise marker that yields dBc/Hz values? The FFT window
function has its own required noise-response correction value, so if you're
just looking at a marker and doing the log10(RBW) subtraction yourself, that
could
I am considering getting a new spectrum analyzer so I can make better
phase noise measurements than with my 8596E. I've looked at the 8566B
and the 8562 and 8563 since I need coverage to at least 6 GHz. The
8566 is huge and ancient, though, so I think I'm leaning away from
that one. Anybody
On Jan 21, 2008 11:44 AM, John Miles [EMAIL PROTECTED] wrote:
After working with a quadrature PLL/LNA, I feel very strongly that anyone
who's serious about PN measurement should go this route. I wasted a lot of
time myself, sitting around wishing I could afford a quieter spectrum
analyzer.
On Jan 21, 2008 12:09 PM, John Miles [EMAIL PROTECTED] wrote:
Still, you should keep what you already have, and add a quadrature PLL and
LNA to it.
As a more-concrete answer to your question, since you mentioned a need for
coverage into the 6-GHz region, an 11729B/C and 8662A would
On Jan 21, 2008 12:41 PM, John Miles [EMAIL PROTECTED] wrote:
John,
I'm a little confused as to what you are suggesting. An 8662A is
about $1500, and the 11729C is about $3k. What would I get for $25?
The parts needed to implement Wenzel's app note:
I am designing a system where I lock a 100 MHz VCXO to a 10 MHz
reference using an AD9510 clock PLL chip. I have two questions to
which I don't know the answer:
- First, given the specs of both oscillators, I know how to choose the
right loop bandwidth. The problem is that I have no idea what
He has ultra high performance rectifier bridges. Sounds like snake oil to me.
Matt
On Dec 13, 2007 5:57 PM, Bruce Griffiths [EMAIL PROTECTED] wrote:
Revised Super regulator link is:
http://www.sjostromaudio.com/_unsql/hifi/
However this may change as the website is in process of moving.
On Dec 13, 2007 6:15 PM, Bruce Griffiths [EMAIL PROTECTED] wrote:
Matt Ettus wrote:
He has ultra high performance rectifier bridges. Sounds like snake oil
to me.
Matt
Try looking at the circuit before commenting.
I did.
Different culture express themselves in slightly different
What I've seen is that field solvers, which don't rely on
closed-form solutions seem to be the state of the art.
Matt
On 3/14/07, Dr Bruce Griffiths [EMAIL PROTECTED] wrote:
Matt Ettus wrote:
I was just investigating this very issue. It seems that every program
you use to compute
I was just investigating this very issue. It seems that every program
you use to compute these impedances comes up with different answers,
sometimes wildly different. Anyone have a free program they trust
with this sort of thing?
Matt
On 3/14/07, Dr Bruce Griffiths [EMAIL PROTECTED] wrote:
On 2/20/07, Peter Vince [EMAIL PROTECTED] wrote:
I don't wish to offend, but that is totally wrong. Even if every
satellite were on the exact same frequency, with the exact same
doppler, and the exact same direction, you would still have no problem
separating the carriers of the multiple
On 2/19/07, Poul-Henning Kamp [EMAIL PROTECTED] wrote:
Does it
rely on the different Doppler-shifts making them distinguishable?
It would have to, if they were not on different frequencies, they
would sum to a single sinewave and you couldn't tell them apart
(unless you have a direction
On 1/13/07, Poul-Henning Kamp [EMAIL PROTECTED] wrote:
In message [EMAIL PROTECTED], [EMAIL PROTECTED] writes:
Actually the USRP v4 seems to have a VCXO already:
http://gnuradio.org/svn/usrp-hw/trunk/USRP_REV_4_2/clock.pdf
Actually, it isn't. Its a plain crystal oscillator.
I'm aware that they use mixers at higher frequencies, but what are one's
alternatives at low frequencies such as a 10MHz reference?
The real answer is not to divide down your reference. This takes
modern PLL chips capable of using a high reference frequency. If you
need fine tuning
In the previous thread, HP 58540A Phase Noise Improvements, Matt Ettus
noted the following:
The jitter that is added by a divider would most probably pose a greater
limit to the phase noise of the PLL than that of the specific OCXO used.
This sounds a little strange. Most of the jitter
Can somebody tell me the master clock frequency of the M12T and M12M
GPS receivers?
Thanks,
Matt
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Is there logic (that I'm missing) to what seems like such an odd frequency?
Matt
On 6/14/06, Randy Warner [EMAIL PROTECTED] wrote:
Tom,
You're close. The M12 series actually has a 16.367 MHz crystal (TCXO in
the M12M). What enables the M12 to get down to +/-12 ns is that it can
place the
Since we can now make DDS's with arbitrary frequency resolution, could
you make an Rb oscillator without the magnetic field adjustment?
Wouldn't that reduce a source of error in frequency? Then we'd be
left with the ideal resonance frequency, right?
Are there any other influences on the
Let me know if you would like to get more detailed info on how we
implemented the GPSDO and DDS, and the caveats we ran into etc.
I'd like to hear more about this.
Thanks,
Matt
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On 8/22/05, Tom Van Baak [EMAIL PROTECTED] wrote:
I measured the phase, frequency and Allan deviation of
the sound card on my cheap PC. You'll enjoy the results:
http://www.leapsecond.com/pages/sound-1pps/
If any of you with a high-end sound card want to repeat
the experiment let me know.
Does anyone have code which will take an amplitude vs. time input
stream and output phase noise and/or allan variance?
Thanks,
Matt
P.S. I was forwarded a message from the list about the USRP. The
USRP does have an input for an external clock source, so feel free to
feed it from your Hydrogen
On 6/27/05, Poul-Henning Kamp [EMAIL PROTECTED] wrote:
In message [EMAIL PROTECTED], Matt Ettus writes:
Does anyone have code which will take an amplitude vs. time input
stream and output phase noise and/or allan variance?
http://phk.freebsd.dk/misc/Allan.tgz
will do allan, modified
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