I have been doing phase combining of power amplifiers for almost 30 years,
professionally.
If I could get 1200W by combining two 300W amplifiers, I would now be retired
and very wealthy indeed.
Unfortunately, there is no free lunch and unless somehow the Gun oscillators
were delivering more
That would only work if the impedance of the source was much lower than the
impedance of the load. That is extremely unlikely in high power systems (at
least in well functioning high power systems), but I heard that modern LNAs do
not always provide the best noise figure when matched, so maybe
Responding to the list in case others have the same question.
DNS is being transfered so the old site no longer respond and the new one does
not yet.
The URL to use for the new manual and timing site (until the ko4bb.com domain
resolves) is:
Http://168.144.151.127/
Thank
Didier KO4BB
--
Sent
, at 6:42 PM, Paul Alfille paul.alfi...@gmail.commailto:
paul.alfi...@gmail.com wrote:
Looking at Cloudflare's website, they claim they will collect usage
statistics for you.
On Tue, Sep 30, 2014 at 8:55 PM, Didier Juges shali...@gmail.commailto:
shali...@gmail.com wrote:
I have looked
paul.alfi...@gmail.com
wrote:
Looking at Cloudflare's website, they claim they will collect usage
statistics for you.
On Tue, Sep 30, 2014 at 8:55 PM, Didier Juges shali...@gmail.com wrote:
I have looked at Cloudflare and as soon as my domain is transferred, I
will
get the free account
.
They have a free tier that works quite well, and even their paid tiers are
much cheaper than an ISP that would work for that kind of bandwidth (I had
no idea it was so high, but it is a great resource).
Thoughts?
-Ryan Stasel
On Sep 28, 2014, at 11:18 , Didier Juges shali...@gmail.com wrote
Shameless plug:
Alternately get my Thunderbolt monitor with a WiFly XBee module and save on
electricity.
Www.ko4bb.com
Didier KO4BB
On September 26, 2014 7:55:05 PM CDT, Chris Albertson
albertson.ch...@gmail.com wrote:
The simple, cheap and easy what to do this is to get a cheap PC of any
Hi Said,
Late reply... (been busy)
The purpose of the straight drive is to maximize the signal amplitude on
the cable. The test intends to demonstrate that it is perfectly adequate if
only the far end is matched, and yet you get twice the amplitude you would
get with a 50 ohm drive signal.
On
This is a public service announcement.
My Host provider (1and1) has in formed me that traffic on ko4bb.com has
consistently and grossly exceeded the unlimited bandwidth allocation
specified by contract(!!!) They have also turned off my service a few times
this month to emphasize the message. I
Messineo
francesco.messi...@gmail.com wrote:
On Sun, Sep 28, 2014 at 6:35 PM, Didier Juges shali...@gmail.com wrote:
Thank you for your patience and your support.
thank to you for your service!
I'm a *nix system administrator since 20 years (well, my job would
turn 20 next year actually). So
Quite a project and extremely well presented and executed.
Thanks for the link to a fascinating read!
Didier KO4BB
On September 17, 2014 5:34:38 PM CDT, Peter Putnam n...@sbcglobal.net wrote:
Greetings,
The link below describes a homemade GPS receiver.
It is presented in a detailed and
Effectiveness of coax cable (at eliminating the effects of current through the
shield) is often expressed as transfer impedance.
Google it for more info, it has been extensively covered in the literature.
Didier KO4BB
On July 20, 2014 11:18:58 PM CDT, Chuck Harris cfhar...@erols.com wrote:
TVs,
networking gear and other various electronics even though I have surge
protectors everywhere.
Didier KO4BB
On June 25, 2014 4:46:07 PM CDT, Chris Albertson albertson.ch...@gmail.com
wrote:
On Wed, Jun 25, 2014 at 1:24 PM, Didier Juges shali...@gmail.com
wrote:
One potential problem
If you want to see how to generate TSIP message, I can post the code to my
Thunderbolt simulator. Its in Visual Basic but it will show you an example.
It generates the primary and secondary packets.
You can download the software from my web site www.ko4bb.com
Didier KO4BB
On June 26, 2014
I am quite familiar with that chip which perfectly illustrates my point. A
universal serial/USB Master interface it is not.
Didier KO4BB
On June 27, 2014 7:14:34 AM CDT, Dan Kemppainen d...@irtelemetrics.com wrote:
http://www.ftdichip.com/Products/ICs/VNC1L.htm
On 6/26/2014 3:39 PM,
Stefan
On 24.06.2014 23:17, Didier Juges wrote:
Thank you Bruce.
Like others, I was saddened to hear of Ulrich's passing.
His contributions and the good spirit under which he contributed were
notable.
He will be missed.
Didier KO4BB
On June 23, 2014 4:58:24 PM CDT, br...@ko4bb.com br
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 Serial-USB adapter on your PC. There is no such thing as a
Serial-USB master interface and never will there be
I think it would be perfectly appropriate to design an LF amplifier with 12AU7s
considering the high signal levels when the storm does get close.
I have been thinking of building a system myself since I already have an
STMicro Discovery board and several GPS receivers I could use.
One
Thank you Bruce.
Like others, I was saddened to hear of Ulrich's passing.
His contributions and the good spirit under which he contributed were notable.
He will be missed.
Didier KO4BB
On June 23, 2014 4:58:24 PM CDT, br...@ko4bb.com br...@ko4bb.com wrote:
Sadly Ina was terminally ill and
After having tried just about every solution under the sun, my opinion is that
within the ambient temperature range (up to at least 100°C) and homebrew
budgets, nothing beats an NTC thermistor.
They are inexpensive, have a large output and interface most easily with a
microcontroller's ADC in
Tom,
I just started getting messages again today after almost a week of getting
nothing.
This account is on gmail
No idea what happened...
Didier KO4BB
On June 18, 2014 10:42:25 PM CDT, Tom Van Baak t...@leapsecond.com wrote:
Paul,
The E3610A posting was a good one. This explains why some
OK Dale,
Take your time and thanks in advance!
Didier KO4BB
On June 9, 2014 9:47:01 AM CDT, Dale H. Cook starc...@plymouthcolony.net
wrote:
At 05:37 AM 6/9/2014, Didier Juges wrote:
If you send me a copy, I will post it with my manuals
Didier -
That sounds like a very good suggestion. I
Hi Dave,
If you send me a copy, I will post it with my manuals
Didier KO4BB
On June 8, 2014 10:22:46 PM CDT, Dale H. Cook starc...@plymouthcolony.net
wrote:
The post about the Truetime DC-60 reminded me that I have a decent
photocopy of the Truetime 60-TF frequency comparator manual. Offhand
The best way is to place the temperature sensor near the part or parts that are
the most temperature sensitive. When dealing with something that is already in
an oven, that may not be so easy.
Didier KO4BB
On April 23, 2014 9:37:29 PM CDT, Chris Albertson albertson.ch...@gmail.com
wrote:
I
Keep in mind that anything you connect across your tank circuit will affect its
resonant frequency and Q (signal source and measuring device). You need to make
sure your equipment is very loosely coupled to the UUT through small value
capacitors for instance.
Didier KO4BB
On April 11, 2014
I have a few of these old PC-104 x86 boards:
http://www.diamondsystems.com/products/prometheusEAL
They have a 100MHz ZFx86 low power processor with built-in Ethernet MAC and
Phy, 32MB of RAM and 2MB of flash and they can run Linux.
I was wondering if anyone had run NTP on a system like this.
You can play with my Thunderbolt Simulator:
http://www.ko4bb.com/Timing/GPSMonitor/TBoltSim.php
(Windows only, sorry...)
It lets you create arbitrary packets (including setting fault conditions
and arbitrary GPS time or coordinates) and properly escapes the embedded
DLEs. The actual string that
Tom,
You are missing the 2002 version I have on my web site :)
I already had the 2003, I will add the others
Thanks for the links
Didier KO4BB
On Wed, Mar 26, 2014 at 2:31 PM, Tom Van Baak t...@leapsecond.com wrote:
For those of you who collect documentation, now here are 4 versions:
I would, but I don't have the time at the moment :)
Didier KO4BB
On March 19, 2014 12:18:23 AM CDT, Tom Van Baak t...@leapsecond.com wrote:
If you can design a system that can handle 6.5 billion requests per
day, this opportunity is for you...
The LMH6702 is a wicked fast op amp which will react accordingly it there are
parasitics in the feedback path. I have only used them with well laid out PWBs
and extremely short traces to surface mount resistors. Under those conditions,
they work beautifully as advertised. Not sure anyone other
Tom and Bob,
It is not obvious to me that it is easier to simply apply a correction in
nS increments with a range as wide as 100nS. How is this done? Using
switched delay lines or delay gates?
In the digital domain, 1nS resolution implies pretty fast clocks. On the
other hand, processing a message
What would be more interesting would be to adjust the temperature of the GPS
receiver's oscillator to eliminate the hanging bridges altogether, kind of like
Trimble does with the Thunderbolt, except that they do it directly instead of
indirectly. That may require to characterize the crystal
If you use a flash-based embedded ARM board, how much is it worth to you that
it works everyday? How much is it worth to you that you do not have to rebuild
it once a year or once a month?
I have several of them and I corrupted one a couple of years ago. It was not
something that was on 24/7
Here comes a brief but shameless plug :)
I just released a significant upgrade to my Thunderbolt monitor with
support for an optional WiFi module that can emulate John Miles' Lady
Heather Server functionality. It allows you to remotely monitor your
Thunderbolt via your home network, or over the
The BBB has 2GB of flash on board (non removable) and has a micro SD socket.
Would not be too hard to keep a backup copy of the OS and apps on the SD card
so that it would be easy to boot from SD and reload the built-in flash if the
BBB fails to boot from the built-in image.
That would not be
A number of people have reported issues with the Raspberry Pi Ethernet hardware
when used for NTP, as it is actually a USB-Ethernet bridge and the drivers may
not be all they could be. I have not had problems myself but I do not run NTP
on it.
The Beaglebone Black (BBB) is supposed to be better
Now that you mention it, I have another small embedded system with 64MB of RAM
that runs Linux 3.4 just fine off a flash drive, so running a RAM disk in 512MB
should be feasible.
Didier KO4BB
On February 27, 2014 9:12:45 AM CST, Jim Lux jim...@earthlink.net wrote:
On 2/27/14 6:40 AM, Didier
The only time there is any exposure is during a write operation
That is not true. By default, Linux updates the last access time for each file
it reads. The last access time is stored with the file, so each file read
actually causes the file to be written to as well, opening the door to all
An very impressive achievement. I particularly like the elegant use of the
PRU to overcome the non-real time nature of the Angstrom distribution.
Congratulations John!
Didier KO4BB
On Sun, Feb 23, 2014 at 9:56 PM, John Seamons j...@jks.com wrote:
Please excuse this commercial announcement
Many ham transceivers can tune that low, but they are indeed completely deaf
because the input filter (including coupling transformer) takes most of the
signal out and the phase noise of the synthesizers cover the rest in noise.
Didier KO4BB
On February 20, 2014 10:35:06 PM CST, Graeme Zimmer
I would support a leap minute. It will still be far enough in the future that I
will not have to deal with it :)
But then we would lose that wonderful subject of conversation and we would lose
the practice of doing it somewhat regularly. I can see that the lack of
practice could easily make it
Hi Dick,
They look very nice, but kind of big for my desktop !!
Not very clear about what message you were responding to...
Didier
On Wed, Jan 22, 2014 at 4:19 PM, Richard Solomon w1...@earthlink.netwrote:
They look very nice, but kind of big for my desktop !!
Thanks anyway,
73, Dick,
web site I have found a lot of good information here
Paul.
On 1/22/14 5:43 PM, Didier Juges wrote:
How about free software?
http://www.ko4bb.com/ham_radio/Clock/
If you want a piece of hardware, my Thunderbolt monitor could relatively
easily be convinced to display UTC and local time
I may have posted this link before. It is on topic, even though I was using
coax cable:
http://ko4bb.com/Test_Equipment/CoaxCableMatching.php
It would be easy to do the same experiment with cat-5 cable. I would expect the
pictures to look somewhat similar.
Didier KO4BB
Tom Van Baak
Since I had a couple of spare RS-232 driver gates, I built a simple PPS
extender/level shifter in my Thunderbolt Monitor kit. It is not as general
purpose (not configurable) as the Fat PPS kit from TAPR, but it works well for
the Thunderbolt. You could easily build the circuit on a piece of
The Thunderbolt uses single precision floating point and digital filtering for
temperature so yes, you are going to see values like this. This is not unusual
(precision clearly out of step with accuracy), like the HP network analyzers
returning gain in dB with 4 decimals at microwave
Must have been Allen Bradley :)
Same problem here with military equipment!
On Thu, Nov 21, 2013 at 4:17 PM, Robert Atkinson robert8...@yahoo.co.ukwrote:
May be a bit of drift and reading back to front. Some years ago we bought
a quantity of moulded carbon compostion resistors from a top US
One thing to keep in mind is that isolation through shielding usually
results in much greater capacitance to ground (actually to the shield) from
both input and output windings.
Therefore, the actual isolation in practice is totally driven by how good
the ground to the shield is.
At RF, any
Alternatively you can put mains through a 40-60 or 50-70 Hz
bandpass filter to suppress anything but the fundamental
The problem with any filtering is precisely that the phase shift through any
filter is highly dependent on the actual signal frequency, so if your purpose
is timing, the filter
Tom,
Don't confuse everybody with facts, we had a good thread going :)
The PicPet is holding its own very well in that application.
I am surprised at the effect of the laptop supply. I would have certainly
expected effect on phase noise (smaller taus), but not that close to the
carrier. Do
For a non Time-Nuts application, I needed a narrow bandpass filter that would
provide essentially zero phase shift (no more than 10 or 20uS was desired) over
a frequency range of 55 to 65 Hz while providing useful reduction of the
harmonics, particularly in the range of 400 to 1kHz. This was to
Turns out that professional gear for this does not do time-stamping in
this regard. Rather, they I-Q demodulate the signal with a reference
signal at the nominal rate, low-pass filter it and pay attention to
details of filtering like group-delay and compensation thereof.
It makes sense to me.
You want to drive the RTC with an external PPS to get time/date into an Arduino?
Why not feed the PPS to the Arduino and have it compute date and time?
It is really not that hard to count seconds. You don't really need an external
chip to do that.
Didier KO4BB
Russ Ramirez
Hi Russ,
I will venture that the vast majority of applications are served with 2 pins
and a $0.10 crystal rather than the external silicon implied by a 1Hz input.
The advantage of off-chip timekeeping is the low power consumption of dedicated
RTC chips that makes them able to run from a coin
It all depends on how accurate the frequency has to be. If you only need
2%, I would use a C8051F300 microcontroller's built-in oscillator (24.5MHz
+/-2%) and divide it down using the processor itself.
The chip comes in a 11 pin QFN that is 3x3 mm, a little bigger than you
need, but it does not
I have actually used these chips at 125C and the factory even gave me
extensive data supporting even higher temperature operation (for missile
applications,m can't tell you more). Don't know about 150C though. That is
pretty high.
On Sat, Nov 2, 2013 at 8:36 AM, Didier Juges shali...@gmail.com
The C8051F300 also has a built-in temperature sensor and ADC, so you could
probably implement temperature compensation without any additional
component if needed.
On Sat, Nov 2, 2013 at 8:37 AM, Didier Juges shali...@gmail.com wrote:
I have actually used these chips at 125C and the factory
Gerhard, please send me the data sheets and I will post them on my site
with the other manuals.
Thanks
Didier KO4BB
www.ko4bb.com
On Mon, Oct 28, 2013 at 7:30 AM, Gerhard Wittreich
wittr...@wittreich.orgwrote:
In my quest to add an MTI 240 OCXO to my TS-2100 I ended up buying one on
eBay
It would seem that you need two counters that share the same gate.
That seems to be the best solution, but I am not aware of any off-the-shelf
counter that does that.
If you only need to count to 200MHz, you could do that in an FPGA. Would
not be too expensive, just buy one of the many available
In order to test my upcoming Thunderbolt Monitor, I developed a small piece
of software to allow me to generate controlled Primary and Supplemental
timing packets per the Trimble spec.
I think the result may be useful to those who own Trimble Tunderbolt
monitoring tools, so I decided to make it
Max,
This is a very interesting project and well documented, thank you!
Didier KO4BB
David J Taylor david-tay...@blueyonder.co.uk wrote:
Among my time nut toys is a Consumer grade GPS clock and a similar WWVB
clock. The WWVB clock consistently runs about 0.2 seconds ahead of the
GPS
one. I
As always, be careful with the hard and fast rules. Most crystal oscillators
generate sine waves first, but if the oscillator is part of a GPSDO, it will
have to be converted to square to be processed by the logic within the GPSDO,
so even if the device has a sine output, there will be a square
With all that discussion about the old temperature sensor in the TBolt no
longer being available, it would be easy to program a small microcontroller
like the Silabs C8051F300 to emulate the old Dallas part. The chip costs $2.32
in unit quantity. It has an I2C transceiver, an analog/digital
Jim,
You should be able to piggyback a second serial port in parallel with the one
used by NTP (just the Rx line and ground) and use any NMEA decoder.
It does not even have to be the same computer.
I have a quick NMEA decoder for Windows I wrote some time ago somewhere.
Didier KO4BB
Jim Lux
In the first post, you state *While I can offer some proof of operation
for qualified TimeNutters,
Allen Variance Noise and sigma-tau phase noise are difficult parameters to
test without an acceptable reference,
so I offer a 14 day acceptance trial to vetted buyers*.
Which could be interpreted to
An even bigger problem is that once they decide they are not making enough
money with it, it won't even be available at any price.
Didier KO4BB
John Miles j...@miles.io wrote:
Don't you just love paying to access research that your taxes already
paid
for? Gives you a warm, fuzzy feeling all
Frank,
You are welcome to upload the article to my web site's manuals pages:
Http://WWW.KO4BB.com/manuals
Didier KO4BB
Frank Stellmach frank.stellm...@freenet.de wrote:
Hi,
Andrew Ludlow himself was so kind to send me the Sciencexpress article,
just a few minutes ago..
A pity that I
While I am at it, I will put a PPS stretcher and RS-232 driver on the same
board since a number of those lose TBolts are used for NTP. I should be able to
do that for the same price.
It seems that 25 ms positive going should be sufficient?
I have created a page to keep track of what I have
I can imagine creating a screen image as a jpeg and making it available via the
web server.
I have done that before for something else (a headless device.)
Didier KO4BB
Chris Albertson albertson.ch...@gmail.com wrote:
On Sun, Aug 18, 2013 at 10:11 PM, Eric Williams wd6...@gmail.com
wrote:
.
I think the monitor should be able to run on atiny uP, something that cost
$20 or so and use very little power, under 1W.
On Mon, Aug 19, 2013 at 4:30 AM, Didier Juges shali...@gmail.com wrote:
I can imagine creating a screen image as a jpeg and making it available
via the web server
Go up about 7 or 8 messages.
It is not a version of Lady Heather for the PocketPC, it is a monitor
software for the Thunderbolt that runs on certain PocketPC (those like the
iPaq that have a hardweare serial port). It is very far from the extended
functionality of Lady Heather, but useful as a
Looking at the high price (and closed software) of what is currently offered, I
have been thinking of making a kit of my GPSMonitor (see KO4BB.com)
I think I could sell an assembled and tested kit with a 2x16 char display for
$60 or so if I get 50 people interested.
Of course, the source code
or $6.So you could assemble something for
$20.
What's going on is that TI builds tens of thousands of these and sells
them
at cost. It is really hard to DIY a uP on a PCB for less than a
LaunchPad.
On Sat, Aug 17, 2013 at 8:42 AM, Didier Juges shali...@gmail.com
wrote:
Looking at the high
This is a repost with a new thread. Sorry for the bandwidth.
Looking at the high price (and closed software) of what is currently offered, I
have been thinking of making a kit of my GPSMonitor (see KO4BB.com)
I think I could sell an assembled and tested kit with a 2x16 char display for
$60 or
Some instruments (Tek 494 for instance) use a 100 MHz VCXO phase locked to 10
MHz for lower phase noise when multiplied into the microwave bands,
demonstrating that there is more than one way to skin a cat.
Didier KO4BB
Bob Camp li...@rtty.us wrote:
Hi
The math is pretty simple:
The Q of
There is a difference between managing the latency (as in ensuring that sound
and video are synchronized, but latency itself is acceptable) and minimizing
the latency as in a Morse code keyer where the operator has to manually control
the generation of elements that can be as narrow as 20mS
I believe the trend for the last 10 years has been to use a positive threshold.
I mess with serial ports all the time professionally and not and I do not
remember the last time I saw one that did not work with a positive threshold.
Didier KO4BB
Bob Camp li...@rtty.us wrote:
Hi
The gotcha with
...@earthlink.net wrote:
On 7/26/13 12:50 PM, Didier Juges wrote:
There is a difference between managing the latency (as in ensuring
that sound and video are synchronized, but latency itself is
acceptable) and minimizing the latency as in a Morse code keyer where
the operator has to manually control
matter quite a bit. I have no idea *why* you would run the key
through a computer in that case ….
Bob
On Jul 26, 2013, at 4:52 PM, Jim Lux jim...@earthlink.net wrote:
On 7/26/13 12:50 PM, Didier Juges wrote:
There is a difference between managing the latency (as in ensuring
that sound
I am familiar with the Epson Seiko SG8002 series and nowhere does it say they
are programmable. They are not user programmable for sure, only the distributor
has the tools to do it. The data sheet does not have any information that would
be a hint that they are PLL's.
You probably meant as an integer divider, you don't get a lot of spurs.
Didier
Bob Camp li...@rtty.us wrote:
Hi
If the DDS is acting pretty much as a divider you don't get a lot of
spurs. The rest of the time there are spurs *somewhere* in the output
spectrum. Put another way, there are
Some of the small surface mount canned oscillators are actually pll and not
very good at that. I have a page about it somewhere on my web site.
Didier
KO4BB.com
Graham planoph...@aei.ca wrote:
Good morning Joe (and all),
I have been playing around with a few of these DDS modules as well as a
is definitely a distributor programmable unit.
It is a digital synthesizer in a can with no effort towards clean
output.
PLL? They would not bother to put a cleanup PLL in the can for the
intended microprocessor application.
Tim N3QE
On 7/21/13, Didier Juges shali...@gmail.com wrote:
I am familiar
Remember that coordinates are absolute, but altitude is relative to the ground.
GPS knows your distance to the center of the earth, but it can only calculate
your altitude if it knows where the ground or sea is at your location. There
are several different earth models GPS receivers use to
Hui, you may want to check this page:
http://wiki.answers.com/Q/What_is_the_relationship_between_sievert_and_becquerel
Your English is much better than my Chinese, you are doing great, don't be
embarrassed!
Didier
On Wed, Jul 10, 2013 at 8:53 AM, Hui Zhang ba...@163.com wrote:
Hello Robert:
Jim said:
It's like a HP 8663B (not the modern Agilent E8663).. very low noise,
The Agilent E8663 has similar SSB phase noise spec as the older HP 8662A
(-144dBc/Hz @ 10 kHz with option UNY, versus -143 for the 8662). You seem
to imply they are different. Can you elaborate?
Of course, the
Marie Curie died at 66 of radiation related anemia. Not a bad age for the
times, particularly considering the amount of radiations her body must have
absorbed during her life.
Didier
lstosk...@cox.net wrote:
I just finished Bernard Jaffe's history of chemistry book. The Curies
spent years in
That works well for transponders with o LY one signal. On commercial
satellites, each transponder is shared among multiple signals, so that would
not work.
Didier
Jim Lux jim...@earthlink.net wrote:
On 7/3/13 2:21 PM, Dennis Ferguson wrote:
On 3 Jul, 2013, at 11:47 , Bob Camp li...@rtty.us
John,
The SD Card issue is serious but not unique go the BBB. I believe there are
ways to configure any Linux distro to make the SD card read only, at the cost
of losing logging and data every time you power off. Alternately, one could
partition the SD card with a second partition just for
A real treat would be to do the GPS receiver with tubes ;)
Didier
Joseph Gray jg...@zianet.com wrote:
Otherwise you might just as well lock it up instead.
Hmm, a 1970 vintage tube transmitter with a GPSDO frequency lock :-)
Thanks to everyone for the suggestions. I will spend more time with
audiophile outlets
You've got to be kidding but not even.
At least, nobody is forcing anybody to buy them...
Didier
Peter Gottlieb n...@verizon.net wrote:
The current distortion from simple transformer-rectifier-capacitor
power
supplies contains a lot of third harmonic content. In a 3 phase
Perrier,
I would be glad to.
About the HP clock manual, I am having a hard time with the foldouts which are
much bigger than the scanner I have access to at work, looking at getting
access to a bigger one.
Didier
Perry Sandeen sandee...@yahoo.com wrote:
All,
I have used photoshop to
I would think that considering the amount of time it takes to get the data out
of the scope (particularly on the cheap scopes) would be a major impediment to
that method regardless of the cleanliness of whatever data you eventually get,
since you will only be able to analyze a small fraction of
Of Didier Juges
Sent: 10 June 2013 18:56
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Datum 9390 issues spectracom 8195a woes
Rob,
I have 50 feet of RG-6 in excellent condition, which is the same cable
I
used to test the other antennas. I have thought it may be bad
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts] Datum 9390 issues spectracom 8195a woes
Didier,
Is it taking any current?
Rob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Didier Juges
Sent: 10 June 2013
and were usually very
sensitive
as long as you watch cable length/attenuation.
It sounds like you Bullet is faulty.
Rob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Didier Juges
Sent: 09 June 2013 19:42
To: Discussion of precise time
My own Trimble Bullet, and others as far as I can tell by reading this
list, is not very sensitive in general. I get much better results with a
Symmetricom than with the Bullet. For that matter, I also see more
satellites with a cheap mag-mount GPS active antenna than with the Bullet.
It is
I just got my Net4501 which I would like to turn into an NTP server. I saw
John's description, but at the moment, I would like to try without using the
high stability CPU oscillator option, just the PPS from one of my Thunderbolts.
Is that even worthwhile? Will the high resolution built-in
Well, its a matter of opinions I guess. The RPi has one UART which is also the
console port, so so much for that, and 17 IOs in total from the link in the
message below.
On the other hand, the BeagleBone Black has 96 IOs including several UARTs. I
have one of each at the moment, and it seems
Bah, 8 pins is way overkill for a fan controller, Microchip has a uC in a SOT-6
package that could probably do the job :)
Didier
Chris Albertson albertson.ch...@gmail.com wrote:
But for many applications, the inevitable overhead
(power, heat, external components, OS, etc) simply
eliminates
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