I would be quite interested in the results of this test from something
like a Ublox 6T or 8 unit.
Please keep us posted.
Dan
On 6/5/2018 2:35 PM, time-nuts-requ...@febo.com wrote:
The next thing I want to try is a receiver self-survey vs the post
processed results... I may be able to
Mark,
Ditto this. On 6T's and M8T's both.
The 6T's do have an odd issue once in a while, right at the roll over
limit from +10.whatever nS to -10.whatever nS, sometimes the sawtooth
value comes in with the wrong sign.
We were playing with the 6T's in a GPSDO, against a good crystal it
Hi,
Anecdotal response.
A few years back we played with using handheld garmin units (GPSMAP
62st) for locating property lines and corners. We averaged for 6 to 12
hours at known standards (section corners). This data was used to
subdivide the section for property corner locations, and these
Hi Bob,
The performance counter does not use the system time calls, NTP, etc.
It's an independent counter clocked from raw CPU clock. So you have a
~300pS Timestamping counter in the processor. Why not use that hardware
to do the measurement? Does the signal have to exit the PC to measure it?
Hi,
Yes, but isn't generating pulses OUT of a PC with low latency/jitter one
of the difficult issues?
If we (somebody smarter than me...) flip this around and modify a copy
NTP to grab the QueryPerformanceCounter value when it gets a PPS pulse
and log that count, don't we now have a way to
Hi,
Don't know how good they are, but there are two functions in the
kernel32 lib in windows that are related to a cpu performance counter,
QueryPerformanceCounter and QueryPerformanceFrequency. (Maybe Linux has
similar?)
Anyway, on most systems the frequency reported is the raw cpu clock.
Hi John,
Thermocouples are very robust, and have a very wide operating range.
However they require extremely accurate voltage measurements to get to
sub degree temperature accuracy. On top of that they require a local
temperature sensor to measure the 'reference' temperature (Or an actual
Patrick,
It's possible that's one of the integrated RF amps, and not just an RF
transistor.
You should be able to tell by tracing out the circuit. The inputs and
outputs will typically be capacitor coupled, with DC fed to the output
through a chip inductor or similar choke and resistor.
Hi all,
So, anyone notice what time their UltrAtomic clock did the dst change?
Mine didn't change last night. Time has been right since it first set itself,
so, I'm suspecting it's getting signal. ( We're in northern Michigan, eastern
time zone.)
Anyone else have a clock that missed dst
Hi,
Not to flood the list with traffic, but as this is probably an issue
that many list members run into I'll speak up. FTDI has been very good.
We've run everything from their very first chips through USB 3 hardware,
and never had any problems.
The TTL-232R series of cables are also very
Hi Bob,
So, what sorts of things are done for high precision survey work? I
would guess a sturdy mount, good sky view, no reflections, good antenna,
no nearby radiators, etc. Those all seem like common sense stuff.
But for applications that really matter, what sorts of things might be
Hi All,
Fair Warning: Nuts Mode Engaged. :)
Recently we've moved to a new house and am in the process of getting the
antennas back up for various things. One of these is the GPSDO(s), and
an obvious location is somewhere on a Roan 25 tower set up just south of
the house. At about half way
This is all cool stuff, and neat to read about.
What's the best (Most stable, most accurate, best adev, etc.) tuning
fork oscillator made?
What the lowest frequency tuning fork oscillator ever built? Was 1Hz
ever achieved commercially?
Fun stuff for Friday!
Dan
On 3/17/2017 12:00 PM,
Hi Bob,
If one prototypes any crystal oscillator, and runs it on a bench. Then
builds an 'oven' of sorts and runs it on the same bench. Would you
expect to see any improvement?
In other words for a given oscillator (crystal and electronics, etc),
will there be any improvements in an oven
Hi,
OK, maybe off topic for this list. It'll be my first and last post on this.
Spent some time on the phone with autodesk. Something interesting came
out of the conversation. The autodesk rep said that he hasn't heard
anything but positive feedback about the subscription licensing. (Yeah,
Hi All,
Just ordered a few of these BME280 sensor boards. Also ordered a FTDI
C232HM cable to try to SPI or to bit-bang data from the board directly
to the PC. If a PIC or similar is required, does anyone on the list have
16Bit PIC code (pic24/dsPIC) C code for reading these BME280 sensors
Depending on the application, another possible application is to
sync up the DC/DC converter to the "main" clock source. This makes
the switching noise then coherent to the system, which either makes
it average out completely, or possible to filter it out in the digital
domain using a deep
On 12/5/2016 12:00 PM, time-nuts-requ...@febo.com wrote:
This is exactly the PWM to PFM mode switch I described earlier.
The 850mA are probably high enough that the DC/DC converter works
in PWM mode, thus switching with a constant frequency, even if the
load changes. On the other hand 200mA
Hi,
=
If you want to go Tom's picDIV route, and are lazy like me, this is one
of several boards available.
https://oshpark.com/shared_projects/kXG6K5Xu
You'll get several copies of the bard board for under $10. Few minutes
stuffing it, and you'll have a working device...
Dan
Hi Lee,
This may help.
http://www.auberins.com/index.php?main_page=index=1
Look at: SYL-1512A (Or any of the others, really...)
If you want to lock a temp down and use a light bulb or similar, this is
a pretty cheap way to go. I've used them for large soldering irons,
reptile incubators, and temp
On 7/27/2016 10:04 AM, time-nuts-requ...@febo.com wrote:
Exciting the Earth with a new frequency (and an adeguate amount of
energy) sets a new rotational speed: you cannot retune a (for example)
quartz crystal in the same way...
Sure you can. Spin it at 100 RPM, or 1000, RPM or even 25000
Hi,
Quick question to the group, maybe slightly of topic.
I'm looking for a quick and dirty algorithm or method to generate a
pulse train at arbitrary frequencies based on a fixed clock source.
This will be run as code in a timer ISR in a microcontroller, so some
calculations can be done.
I’ve been doing SMT assembly for 40 years. I have never ever seen anybody with
a process
that “just worked”. They all involve some amount of fine tuning and design
optimization.
Hi,
Yep, The amount of tweaking required to get a good board build can be
extensive. Part density, ground
The 2378-20 is a pretty nice ADC. I expect the 2368-24 to be good also.
It should be easy to see at least -130dBfs noise floor with an FFT. Keep
in mind supply rail noise, and REF voltage noise etc. That's a lot of
resolution and bandwidth in one unit!
The DC890B board appears to run an FTDI
Hi,
I've looked at the higher end TDC from ACAM. They claim a 40Mhz data
rate, with burst of 200Mhz max. However it wasn't clear what the maximum
sustained rate would really be. Answers became a little obscure when
pressed for maximum sustained data rates. Overall the chips weren't
horribly
On 4/22/2016 12:00 PM, time-nuts-requ...@febo.com wrote:
On 4/21/16 6:03 PM, Tom Van Baak wrote:
>Paul,
>
>If possible can you make an audio recording of a woodpecker attack? You know
it's a form of 1pPS.
>I'd like to add that data set to my list of ADEV plots.
>
I am sure, like almost all
Hi,
Sorry, I have to speak up here. This fake stuff isn't "clone" FTDI
hardware. It is counterfeit hardware. And it uses FTDI's VID illegally.
FTDI should block counterfeit hardware from using their drivers. Making
the assumption that the counterfeit junk will work, and putting blame on
Hi all,
Thanks for all the responses.
The GPS units were swapped on the splitter ports, and the phase
difference did in fact change. It changed from 21nS to around 5nS. Not
exactly what was expected, although it would tend to indicate the RF
path is not the same through the splitter.
Last
Hi Bob,
I have a similar oscillator tied to a GPSDO that another list member is
developing. I have not seen the EFC turn around! That's seems very unusual.
If you are interested, I may be able to give you a plot of my EFC over
the last ~3000 hours. Pretty boring decay curve, with the
Hi,
If you search the internet, you should come across a design by Warren S.
It's basically the same type of oven controller that is used in the
internal oven for that oscillator.
I did a surface mount version of his design a while back. I've been
running it for quite a while now. IMO it is
Hi Dan,
74LVC1G80. See: http://www.ti.com/lit/ds/symlink/sn74lvc1g80.pdf
Might be worth looking at.
Dan
On 6/9/2015 4:24 AM, time-nuts-requ...@febo.com wrote:
Let's say I have a 20MHz TCXO. I want to square up the output signal and
divide by two. Easy, just a buffer or inverter and a flip
Hi,
In all reality, achieving these results without decades of experience is
probably unlikely. That said, are the specific plans available or
published anywhere? Is is possible that someone willing to build and
tinker could make a 'functional' copy of this unit?
I would guess that not all
Hi,
Correct me if I'm wrong but being that AC series gates are MOS devices,
isn't there inherent current limiting in the MOS junction itself? I
would think that for the few nanoseconds of skew across gates the tens
of ohms of junction resistance would make 'shoot through' negligible in
terms
Martyn,
In working with a 6T receiver we have noticed that sometimes the
reported offset correction is not correct. These instances appear to be
infrequent, and have only been noted as a single instance at a time. For
example you will occasionally get a -10.2nS correction when you should
get
Hi All,
I'll respond to all here, since I'm a little slow at times...
John, This unit has been up and running for at least a month. I've
restarted the GPSDO a few times, but the GPS has remained on. So, if
your unit is up for extended periods of time and you see something
similar, please
Not sure if this is quite the right platform, but for someone wanting to
experiment it may be worth a look...
https://www.kickstarter.com/projects/swiftnav/piksi-the-rtk-gps-receiver
http://www.swiftnav.com/piksi.html
Dan
Date: Tue, 16 Dec 2014 16:01:28 -0800
From: Jim
Hi All,
Thanks for the responses. I had a feeling the answer wouldn't be good,
but was hoping someone would have a suggestion. There are currently a
bunch of regulators in the 'system'. If there were some really good
regulator out there, the shotgun approach would apply...
Of course it is
Hi,
In playing with some oscillators and a GPSDO here, I think I'm seeing a
voltage sensitivity issue.
So, I started looking at the output voltage of various regulators vs.
temp. Using standard LM/UA type linear regulators and some LDO's, they
all appear to be pretty sensitive to
Hi All,
I've been playing with some double oven HP10811's. I've been monitoring
the internal oven feedback vs. temperature and noticed something
interesting last night. There was a sudden step change in internal oven
feedback voltage. This is the voltage coming from the amplifier
monitoring
Yokogawa has been around for quite some time. They make some very nice
self contained data recorders and data acquisition systems. Think of
high resolution oscilloscopes with 8 or 10 channels and large hard
drives for data storage. They have interchangeable amplifiers, for
thermocouples or voltage
Hi All,
Considering this old stuff was that good, what's the best that's
currently available now? How does that compare to the best that's ever been?
Dan
On 10/3/2014 7:19 AM, time-nuts-requ...@febo.com wrote:
Tom,
Nice performance. Wish we could get that today! My fairly modern BVA is
Hi Bob,
Being relatively new to this 'high end' time stuff, there's lots to
learn... So, how much bandwidth might a typical OCXO have on the EFC
pin? My assumption is that it is very low, but I have nothing to back
that up.
If I had 10Mhz or some other high frequency on the EFC line, would a
Tom,
Awesome! Thanks!
Section 2-14. Since noise on the EFC line affects the oscillator's
stability (noise appears as FM on the output) care must be taken to
ensure that a relatively noise free EFC...
I was thinking the Varactor had be tied to the crystal, which only makes
sense. So, the bottom
Hi all,
I have an PTI OCXO. The trimming voltage is two pins, with a maximum of
6.8VDC across the pins. They specify using a 20K pot as the adjustment
mechanism. However, I hope to use this thing in a closed loop, and will
be driving it with an active device.
What got me thinking is if the
Björn and Tom,
Thanks for the links. It helps visualize things a lot! Our snow was
unusually weird last year. It stuck on everything, any stick larger than
a pencil had at least basket ball sized hunks of snow on it. That's
probably a worst case scenario, tho.
Joe,
OK on the study of snow. It's
Björn,
Can you provide links to some examples? A picture or two would be great!
Attila,
Almost all the snow we get accumulates. However it does settle, even
then by mid February it's not unusual to see 4 or 5 feet on the ground...
However, that raises a good questions, in terms of cones and
Hi All,
Just purchased a LEA-6T based board to play with (It's a Synergy Systems
SSR-6Tru). The Ublox web site has some documentation regarding the setup
of these units. In the documentation are some screenshots of what
appears to be a utility for configuration. I haven't seen it on the
Ublox web
FYI. It is still available. Don't have it in hand yet, but one was
ordered just a few days ago...
Dan
On 8/21/2014 6:34 AM, time-nuts-requ...@febo.com wrote:
One example
is Synergy Systems' SSR-6Tr if it's still available. It was announced,
and discussed on this list, in 2012 but it still
For what it's worth:
One possible source is through GE Thermometrics. They used to be Just
Thermometrics bug GE bought them. The offer calibrated thermistors (At
leas they used to offer calibration), with AB and C vales stated.
Not sure what the costs are, but they make some pretty nice
This is a 10Mhz osc, so good for a few things. As far as I can tell, it
has an input for adjustment, so I was hanging onto it for an oscillator
for a GPSDO project some day. It's about a 1.5 by 1.5 metal can, and
since bigger is better I was hoping it was good! :) I don't really have
any way to
Hi All,
Was looking through my basement the other evening, and ran across an
OCXO I have laying on the bench. I was wondering if any of you may have
information regarding this unit, or have used it in the past.
It's an Pti XO5009. It cam from a Harris TV transmitter exciter. I
believe it was the
http://www.ftdichip.com/Products/ICs/VNC1L.htm
On 6/26/2014 3:39 PM, time-nuts-requ...@febo.com wrote:
USB may be a common interface to a computer but practically useless to
another microcontroller.
Everything can do serial but not everything can do USB master. In the worst
case, use a
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
circuit will couple through a N:1
I looked into one of the high end units for a project. From what I
recall, the resolution was high. The problem for me was the continuous
throughput was not there. I was looking at making around 30 to 40
million measurements per second. As I recall, it it could burst at that,
but not sustain it.
At which resolution do you wish to get 40Msps? Tell me the single-shot
jitter figure. So far we had only several ksps of throughput in our TDC
circuit, but the bottleneck lies within a computer interface.
Anyway, it is not an easy task to get some 200MB/s into the computer in a
sustained
Some people say:
HP = High Price
Sorry, couldn't resist! :)
On 3/26/2014 6:10 PM, time-nuts-requ...@febo.com wrote:
Message: 3
Date: Wed, 26 Mar 2014 17:47:36 -0400
From: Bob Camp li...@rtty.us
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re:
Bob,
Just been reading along, enjoying the conversation...
I've written a lot of hand coded assembly. Some of it very similar to
what you are doing here now. (Although, a different processor family)
I really didn't want to switch to C for anything, since code generated
is 'bloated'.
That being
Not know much about the clock in question... ...how about replacing
the weight and cable with an endless cable and motor to constantly
'pull' on the thing... You might have to remove a few parts, but may
be able to make the changes so you can always restore the clock to
original condition
The SX was/is a great chip. (I still use them on a near daily basis)
Troubled history, though. This is part of why Parallax developed the
Propeller.
The premise behind the propeller, is that it is based on the Virtual
Peripherals of the SX. You simulate peripherals by having interrupt code
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
The microchip pics on the bench here actually have the oscillators in
them for the 32Khz xtal. That is, the gain and feedback to make the
crystal run are in them. All that is needed is some capacitance to
ground. This is why the SOSC (Secondary Oscillator) uses two pins. You
can also use a single
FYI, if you are measuring the voltage with a fluke or similar meters,
I've seen them throw a lot of noise onto a signal line. In many cases
we've had to put an RC filter coming from the fluke to block the noise
from the meter getting into the circuit!
Also, you aren't running a KW Ham transmitter
Hi all,
I've got a project upcoming that will require a frequency of 32.768 Khz
in a harsh environment (Imagine a thousand G's at 100Hz with 150 Deg C
temperatures). Also, this thing needs to be small, 2mmx1.5x1.5mm or so.
It also has to be low power. Frequency stability is probably less of a
On 10/2/2013 10:34 PM, time-nuts-requ...@febo.com wrote:
Hi guys,
I am going to pull it apart this weekend and do some more exploring. Hope to
get some pictures for reference.
I think I will make up some extender cables so I can operate the CBT
assembly away from the main chassis.
I don't think the state of the art is exceeding the need. Because by
nature that is part of what ham radio is. Experimentation is part of the
game.
Nothing wrong with appliance operators, if one chooses to be that. There
are plenty of appliance radios out there. SDR just may not be there yet.
Of
ARRL did a review of a brand new Rigol spectrum analyzer. (Don't
remember the model # off hand). But for about $1500,you get an analyzer
about the size of the small modern scopes, with warranty. The review
wasn't bad, but the unit had a few minor quirks. Depending on your
application it may work
On 7/10/2013 11:35 AM, time-nuts-requ...@febo.com wrote:
Public perceptions of risk change with time.
In WWII, Radium dial watches, aircraft instruments, dial and switch
markings, were ubiquitous. But so were explosives, bombs, bayonettes, and
a bunch of other things. So people didn't have
On 7/2/2013 5:07 PM, time-nuts-requ...@febo.com wrote:
On the other hand, i know a guy who does sub-cm positioning with unmodified
LEA6-T, by logging their satelite phase data and heavy post processing over
hours of data and comparing it to a neaby basline of two stations with
known
Note to self, Not getting on any Russian made rockets any time soon.
At least the rockets were unmanned, and hopefully no one on the ground
was hurt!
Sounds like this isn't the first time this happened, and it isn't the
first time they lost three Glonass birds. Wonder how much money was lost
in
I can recommend the Pic24/dspic33 series chips. I spent a bunch of time
looking at different options, and ended up with the pic family. There
are a lot of really nice micros out there now. Not like years ago.
The Pic's aren't the fastest chips out there, they aren't the newest
chips out there,
This may be way off topic, but the inrush current problem is probably
with devices not meeting the USB specification. As it turns out, a lot
of low end devices do not meet this spec.
I spent some time redesigning the power supply system of one such device
I was using. This time was covered by
Try Stabilant.
http://www.amazon.com/Stabilant-5ml-Kit-Makes-30ml/dp/B001E50GQS
I have no affiliation with this product. I've used it to fix
intermittent connections that drove me crazy. It's not a contact
cleaner, and you'll have to read the details to understand what it does.
It's also
Good explanation. I guessed, since the list is time nuts I assumed
real time in reference to an OS would be understood. :) My bad.
Because windows is not a real time operating system (RTOS), I lack
seeing the purpose in getting the windows clock synchronized to within
microseconds or
On 3/27/2013 2:54 PM, time-nuts-requ...@febo.com wrote:
Then all bets are off if you have a CPU that runs at variable speed if you
want the result to be actual time.
I think that got fixed on newer CPU chips. I don't know when.
Another interesting problem in that area is that the temperature
On 3/26/2013 2:43 AM, time-nuts-requ...@febo.com wrote:
albertson.ch...@gmail.com said:
I think you can get Windows to run at the few milliseconds of error range
with the standard NTP distribution.
I don't think I've seen anything that bad, but it's easy to be off by 100s of
ms if I download
Let's get everyone on the same page:
http://www.microsoft.com/en-us/windows/endofsupport.aspx
Also, do we all have the latest updates?
That being said even with all the updates, my daughter missed the bus
this AM, because my WinXP machine said it was 7:01 am EST, when in fact
my phone told me
Because, up until today, windows time did what I needed it to do. It may
still, if the fault turns out to be network related.
In reality, it's more software to learn to administer, and setup and run
on bunch of PC's. As a time nut, I know exactly how much time I need for
all of my other
On 2/28/2013 11:37 AM, time-nuts-requ...@febo.com wrote:
About the difficulty of measuring every cycle with a conventional
counter... thanks for that info, seems that i?ll have to make my own
measurement hardware. I liked the idea of a time stamping counter
it?s very doable in a FPGA:)
At
On 2/11/2013 10:35 AM, time-nuts-requ...@febo.com wrote:
It is unlikely to add much noise. The PoE device only puts a DC bias
on the twisted pair. The data signal is differential. It is
transformer couple to is pretty much is immune to common mode noise.
So even iif the DC bias was noisy I
We do 0603 and 0402 with IC's at .5mm lead spacing all day long. Under
stereo zoom, it's not an issue. We have 50+ year old techs who build
this stuff all day...
We have one of these on every bench. At around $700 new for the 3x to
90x Zoom it's not bad. But may be prohibitive for home use. I
Juts an FYI. I thought fiber was lightning proof also. As it turns out
the fiber used by phone companies has copper tracers in it for
location purposes (Without metal it's hard to find where it's buried).
This in turn causes lightning strikes to cut fiber fairly often. I
wouldn't have though
I was just surprised it locked at that speed. I figured a handheld unit would
not be able to lock at that speed. Looking back on it now, it makes sense it
shouldn't have too much trouble. (Once I learned it worked I started to ask
about the GPS more. If you ask politely, a lot of times they
I know for sure my handheld Garmin works at 27000 feet, at
530mph... ...I was actually surprised it worked up there.
It made me wonder what the actual limits are.
On 1/30/2013 12:00 PM, time-nuts-requ...@febo.com wrote:
How to check if a GPS works at 60,000 feet: send up a balloon:
On 1/22/2013 8:25 PM, time-nuts-requ...@febo.com wrote:
Interestingly, this experiment may also become the first time we
ever needed to know PI better than 355/113 outside abstract
mathematics.
Good thing this is easy now. It took a long TIME, but I ran PI out to
80 billion points using a
On 1/1/2013 4:58 PM, time-nuts-requ...@febo.com wrote:
True story:
Many years ago when the very first ARM silicon arrived and they started
testing it, it was generally execeeding expectations but a little bit
flakey at high clock rates.
After the bubbly had been drunk and hangovers subdued,
Hi all,
I've been following this list with some interest, and have a question
about two individual timing GPS units PPS outputs. Let's assume that
the timing GPS units are identical units, say two SSR-6t's for example.
If I take these two units and fire them up next to each other off of
the
On 10/10/2012 8:00 AM, time-nuts-requ...@febo.com wrote:
albertson.ch...@gmail.com said:
The satellites are in 12 hour orbits. Everything repeats every 12 hours.
But the sun is on a 24 hr. period and if you did two 12 hour tests you don't
want to do one at night and one in day. So start
On 9/17/2012 6:03 PM, time-nuts-requ...@febo.com wrote:
OK, you can test a VP Oncore GPS receiver alone if you have a mean to
translate the TTL serial port to a regular RS232 for the PC. This can be
done with a MAX232 chip (or equivalent). Then the pinout (refer to the
FYI, I've had really
On 9/18/2012 1:48 PM, time-nuts-requ...@febo.com wrote:
In the old CRT type TV sets, the phosphor has some persistence.
Movies are modulated with a square waves, the frame blinks off and
goes dark then blinks on. But the LED's brightness is fast enough to
track the sine wave and would be
On 9/14/2012 8:00 AM, time-nuts-requ...@febo.com wrote:
For those of you interested in timing mechanical clocks or watches, a wonderful
site to visit is:
http://www.bmumford.com/microset.html
/tvb
So, does this unit include an input for a external reference? I would
be interested in
On 9/11/2012 9:43 PM, time-nuts-requ...@febo.com wrote:
Given a choice, I always go USPS to my PO Box. It is fast and cheap. The
PO Box takes a day or two off the delivery and one less carrier to ruin
the shipment.
I used to do this a lot. Then the USPS delivered one of my packages to
the
On 8/27/2012 6:15 PM, time-nuts-requ...@febo.com wrote:
I got an old Meinberg GPS, with an analogue integrating single-channel
receiver, and put at a friends appartment. Still works great, after me
convincing it about a new location. It has two time-tagging inputs, so
you can get UTC
However, since we are all nuts here, adding a GPSDO coulnt' hurt.
(Usually you shoot outside, so access to the sky should be easy!) Then
you'd also know position, which could be useful in accounting for
numerous other thing like coriolis acceleration, gravity due to
elevation, and gravity
More importantly, how many things don't really need a clock to begin
with! :)
Every piece of equipment in our house shows a different time. I
wouldn't complain if they all automatically adjusted. My current
solution is to just stop looking at the clocks, and it's amazing how
much easier life
I've had really good luck with anything based on the FTDI chip set.
Other chip sets have
given me problems...
Dan
On 5/22/2012 6:37 PM, time-nuts-requ...@febo.com wrote:
I have yet to be happy with any USB to serial conversion in legacy
applications. They always end up less than transparent
One interesting note however. Years ago we had a standard old 4040
ripple counter in our shop that displayed a low occurrence of jitter
of several times it's input frequency period at it's lowest frequency
output (Sort of what you are describing below). I wish I had the
numbers handy, but the
Don't forget the human mind can compensate for a lot of things. Think
of how we can triangulate a sound source in realtime even with the
included echos in a small room. The only thing that I can think of
that messes with that system is a single tone setting up standing
waves. It's impressive
I have a friend who builds and sells power supply units that I
designed. He may be interested in building some of these.
If I had to guess, he'd be willing to build units and sell them on his
web site.
Who owns the IP for this project? Maybe we could get some input or
direction...
Contact
Wouldn't get broken if you hand carried it. I've carried on similar
equipment when flying across the US. I'm guessing you may not have to
check it for an internationl flight...
Dan
On 4/18/2012 8:03 AM, time-nuts-requ...@febo.com wrote:
Almost worth flying to NYC for the weekend from
I'd have a hard time doing a lot of what I do with an analog scope. I
have a lot of logic running at high frequency, and find myself
triggering on single pulse events that happen infrequently. The
advanced triggering options of digital scopes make seeing these events
possible. Just the pulse
1 - 100 of 104 matches
Mail list logo
