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
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
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
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
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
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
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
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...
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 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.
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
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
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
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
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
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
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
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
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,
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:
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
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
.
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
, 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
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
Most EEPROMs have I2C or SPI interfaces. Some Flash chips have JTAG.
Didier KO4BB
On October 10, 2014 4:47:19 PM CDT, Tom Wimmenhove tom.wimmenh...@gmail.com
wrote:
Thanks Joe!
I don't have the clip-ons but of course I could get them. I know the
chip
has a JTAG interface, but I've only used
Just to put that in perspective, we're measuring a few degrees of phase
shift in a 32 GHz signal on a path that is over a billion km long.
Now this is fully qualified nuttiness :)
Didier KO4BB
On October 10, 2014 8:17:13 AM CDT, Jim Lux jim...@earthlink.net wrote:
On 10/9/14, 10:16 PM, Andy
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
at 7:45 AM, Didier Juges shali...@gmail.com
wrote:
Most EEPROMs have I2C or SPI interfaces. Some Flash chips have JTAG.
Didier KO4BB
On October 10, 2014 4:47:19 PM CDT, Tom Wimmenhove
tom.wimmenh...@gmail.com wrote:
Thanks Joe!
I don't have the clip-ons but of course I could get them. I
Check lightningmaps.org, mentioned on this list before for lightning location
via TOA using STMicro Cortex -M4 devices.
Didier KO4BB
On October 20, 2014 8:39:16 PM CDT, Joseph Gray jg...@zianet.com wrote:
What does everyone think of this GPS module for ntp use? According to
the
specsheet, it
Even more effective would be to sample the entire 10MHz waveform instead of
just the zero crossing. By doing a best fit of the entire waveform, you should
be able to estimate the zero crossing with much greater precision because now
the noise is averaged over the entire waveform instead of a
Charles,
You can always upload time-related material to my Manuals page:
www.ko4bb.com/manuals
Didier KO4BB
On November 3, 2014 2:43:47 PM CST, Charles Steinmetz csteinm...@yandex.com
wrote:
Tom wrote:
As I understand it, his project is to use the high frequency output
of a ublox NEO-7M to
Brooke,
Following the links from your page (nice work, thank you) lead me to your
Thunderbolt page where you ponder the death of your iCruze monitor.
If you refer to the picture of the microprocessor board, you will notice that
the locations marked D1, D2 and D3 are populated by zero ohm
Graham,
There are a number of WiFi to serial modules like the one I use on my
Thunderbolt monitor: The Microchip WiFly RN-XV-171. Once configured (typically
using a PC), they will present a TCPIP port (TCP or UDP) from which you can get
and send data directly to the serial port.
Alternately,
Jim,
I have somewhere a piece of VB 6.0 code that decodes NMEA sentences and puts it
pretty on the screen (at least that's how I remember it :). I am not at home at
the moment but I'll be glad to send it to you if you are interested. May not do
what you want, but it will get you started.
Well, that obviously went to the wrong place.
That was a private message, sorry for the bandwidth.
Didier
On Mon, Dec 10, 2012 at 12:06 PM, dlewis6767 dlewis6...@austin.rr.comwrote:
Thanks, Didier, if you ever find a mainframe for it, please keep me in
mind.
Thanks, -Don
I do not understand how anyone can guaranty no missing codes when the lower
11 bits are essentially noise? (31 bits resolution versus 20 effective bits)
On Mon, Dec 10, 2012 at 2:19 PM, li...@lazygranch.com wrote:
It is 31 bits with no missing codes. Usually missing codes is of concern
in
How long does it take to prove it?
And what's the point?
On Mon, Dec 10, 2012 at 3:04 PM, Gerhard Hoffmann dk...@arcor.de wrote:
Am 10.12.2012 21:53, schrieb Didier Juges:
I do not understand how anyone can guaranty no missing codes when the
lower
11 bits are essentially noise? (31 bits
, and noise
will limit the usable resolution.
On Mon, 10 Dec 2012 15:08:38 -0600, Didier Juges shali...@gmail.com
wrote:
How long does it take to prove it?
And what's the point?
On Mon, Dec 10, 2012 at 3:04 PM, Gerhard Hoffmann dk...@arcor.de wrote:
Am 10.12.2012 21:53, schrieb Didier Juges
You may have noticed that the miles.io URL now redirects to the Symmetricom
page.
That would be a clue :)
Didier
On Wed, Dec 19, 2012 at 2:56 AM, Timeok tim...@timeok.it wrote:
see : http://www.symmetricom.com/lp/**gbu/email/phase-noise-test-**
Actually I have had better success with Zener diodes. The 1N47xx series in
particular I have used up to VHF with good results. Take a diode with a
zener voltage specification 20% above your operating voltage and it may
just work.
Didier KO4BB
On Tue, Dec 18, 2012 at 1:51 PM, Robert LaJeunesse
Tom,
This may not be the answer you are looking for, but the simplest way may be
to use a uC that has a PLL for clock generation.
Didier
On Wed, Jan 2, 2013 at 12:54 PM, Tom Van Baak t...@leapsecond.com wrote:
What's the simplest way to generate 16 MHz from 10 MHz? This will be for
clocking
These days there's a trick where you can borrow things like dev boards.
As long as you don't trash them, there's no charge. Often they seem to
forget you have them….
These tricks work best when you actually use that kind of product in your
day job and the sales rep has the hope of eventually
Before you know it, you are going to find that not having php (or Python, or
Perl, or whatever your favorite scripting language is) is crippling. I
recommend you bite the bullet and get a small ARM SBC big enough to run a full
Linux distro. I use a TS-7553 from embeddedarm.com with great
If you decide to go with one of the SBCs at embeddedarm.com, I have a Wiki page
on my web site documenting how I have set mine up.
Didier
Www.ko4bb.com
Sent from my Droid Razr 4G LTE wireless tracker.
-Original Message-
From: Jim Lux jim...@earthlink.net
To: Discussion of precise
Message-
From: Didier Juges shali...@gmail.com
Sender: time-nuts-boun...@febo.com
Date: Tue, 12 Feb 2013 13:47:41
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re
on occasion
caused
capacitive line filters on nearby equipment to overheat and catch fire.
Peter
On 2/23/2013 7:53 AM, Didier Juges wrote:
I am curious how this compares with the zero crossing method.
I suppose it should work much better because this method will not be so
sensitive to noise around
Of course, you are welcome to use any part or all of it. Software is free and
the hardware cost almost negligible. If you don't do C, that would be an
excellent way to get started with something simple and that works and that does
something you need.
Didier
Sent from my Droid Razr 4G LTE
These are handy little boxes for the money. Unfortunately the outputs are
not isolated from each other (galvanically and signal-wise) so be mindful
that if you connect/disconnect one port, the adjacent port will be
affected. Unless you need to, it is probably best to wire all 3 inputs in
parallel
I snatched one for $20 and they are now $59 or best offer.
On Sun, May 19, 2013 at 11:18 AM, Bob Camp li...@rtty.us wrote:
Hi
There are a number of things that a Net4501 could be used for….
Bob
On May 19, 2013, at 10:45 AM, Jason Rabel ja...@extremeoverclocking.com
wrote:
Just a
While I have often said that I have more time than money, I still consider that
my time is too scarce (or valuable) for assembly language.
My opinion is that the language for small embedded devices is C. Some may
disagree, but after over 40 years of writing software for a whole bunch of
The Pi has virtually no IOs, not good for any embedded system.
The BeagleBone Black on the other hand has plentt of IOs
Didier
Jim Lux jim...@earthlink.net wrote:
On 5/25/13 10:55 AM, Chris Albertson wrote:
3) the Pi is almost PC-like and very easy to use. Costs about $40
and requires a
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
For some of the TI and NXP boards I have seen, the debug chip is clearly bigger
than the target, probably due to the fact that the debut chip has USB and USB
is typically only supported in the bigger chips.
Didier
Bob Camp li...@rtty.us wrote:
Hi
It is interesting how the various outfits
My Blackberry gives me several options for time, including the option to sync
from the network on cue, but it will only display the current time with a
resolution of 1 minute. There may be 3rd party apps that do better, I have not
looked, but I am a little miffed that the phone does not have a
It was the Chinese new year. China closes for about 2 weeks and nothing gets
done.
Didier
Sent from my BlackBerry Wireless thingy while I do
other things...
-Original Message-
From: Brooke Clarke bro...@pacific.net
Date: Wed, 17 Feb 2010 11:33:36
To:
The original 723 (I remember the uA723 made by Fairchild, I still have a couple
of 30 year old parts here) had a buried Zener and was considered pretty quiet
at the time.
I am not sure how it would compare with today's low noise references, but the
last time I checked, it was pretty good,
Eugen,
My understanding is that in Germany, a suitable alternative to the Trimble
Thunderbolt is as follows:
http://www.ko4bb.com/Trimble_Thundebolt.png
:)
Didier KO4BB
(sorry, I could not resist...)
Eugen Leitl eu...@leitl.org wrote:
Hi -- a couple somewhat lunatic questions.
I believe Gray code was invented to support absolute mechanical position
encoders, where the speed of the electronics is high compared to the speed of
the hardware being monitored. It eliminates the potentially large error between
two positions since only one bit changes at a time. This is done
Considering that there are two main components in the display, it could be
either the microcontroller, the LCD display, or the cabling between the two.
I am not sure what you mean by swishing, but if shaking it fixes the problem,
even momentarily, it may be as simple as a cold solder joint.
It
Must be the Y2.01K bug...
Sorry about the problems being reported recently.
While I have no association with Bob of Fluke.l, he is using my design and he
was kind enough to send me one demo model, which I have yet to turn on.
In general, if the processor is not fried, there is very little that
Bill, I think you got it backwards. +/- 12V is typical for RS-232, 0/+5V is
for RS-422 and RS-485.
No RS-232 receiver should be damaged with +/- 12V or even +/- 15V because
that is their normal operating voltage.
Also, RS-422 and RS-485 have something like 25V common mode tolerance (not
sure
time and frequency measurementtime-nuts@febo.com
Subject: Re: [time-nuts] Z3805 utility, Was: AW: (no subject)
Didier Juges wrote:
Bill, I think you got it backwards. +/- 12V is typical for RS-232, 0/+5V is
for RS-422 and RS-485.
No RS-232 receiver should be damaged with +/- 12V or even
I found it, it was uploaded as 5078 and I blissfully saved it under that
name, I am fixing it :)
Didier KO4BB
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of paul swed
Sent: Saturday, May 22, 2010 9:15 PM
To: Discussion of
Steve Rooke sar10...@gmail.com wrote:
...
Lets explore frequency measurement in a way that we all can
understand. No oscillator can be measured in isolation, it has to be
measured against another standard oscillator.
The last part of your statement is not true. An oscillator's period
WarrenS warrensjmail-...@yahoo.com wrote:
Ulrich posted a bunch of logic stuff, some of which I did not understand.
but I do think he missed the main point
I personally think Warren missed the point entirely, but it's just my opinion.
This statement is a good summary of what has
My understanding is that you have the older red box. Manual for the red box
is there:
http://www.ko4bb.com/Manuals/05%29_GPS_Timing/Trimble/Trimble_-_Thunderbolt/
ThunderBolt_Datasheet_%28red_box%29.pdf
The power spec is 24V nominal, 18V min to 36V max
Mine has been running off a small open
The TB has an error flag if there is no antenna connected (open) or if it is
shorted. The tboltmon PC software reports these flags, and so does my GPSMon
firmware in the fluke.l monitor.
It is possible but unlikely that there would be something wrong with the bias
circuit that would not be
Tom,
I took the liberty of converting your post into an entry in my Time-Nuts
Wiki:
http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:phase_frequency_m
easurement_methods
Please note anyone can edit this Wiki or create new pages.
Didier
-Original Message-
From:
Didier
On 13 June 2010 21:51, Didier Juges did...@cox.net wrote:
Tom,
I took the liberty of converting your post into an entry in my
Time-Nuts
Wiki:
http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:phase_frequ
ency_m
easurement_methods
Just to let you know that your
This is a test...
http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:phase_frequency_m
easurement_methods
http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:phase_frequency_
measurement_methods
Didier
___
time-nuts mailing list --
: Re: [time-nuts] Advantages Disadvantages of the TPLL Method
On 13/06/2010, Didier Juges did...@cox.net wrote:
I saw that. There is nothing I can do about it other than
by using a
url shortener
You can hint to most email clients that you'd like lines
unbroken, using angle brackets
Testing, testing, testing...
I made a registry change which should prevent Outlook from breaking the line on
transmit...
Didier
-Original Message-
From: Didier Juges [mailto:did...@cox.net]
Sent: Sunday, June 13, 2010 10:08 AM
To: 'Discussion of precise time and frequency measurement
That now works here. For those using Outlook, here is the fix:
http://support.microsoft.com/default.aspx?scid=kb;en-us;823921Product=out2003
Didier
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On Behalf
Of Didier Juges
Sent: Sunday, June 13
I was using Thunderbird for a while, and the main advantages, from a practical
standpoint, were the full access to the message headers, better control on
formatting and better spam filtering, but since I have been using a
Blackberry, I have appreciated the excellent integration of Outlook and
I promised myself I would not get into this any more, but here we go again...
WarrenS warrensjmail-...@yahoo.com wrote:
Charles posted:
but the locked frequency will be different from both oscillators'
free-running frequency and
the EFC will not correctly indicate the test oscillator
Joe,
You probably already have a phase detector capable of receiving your 90 MHz
signal: a good old broadcast FM receiver. Send the audio to the scope or
spectrum analyzer and you should see your 137Hz signal.
Didier
Sent from my BlackBerry Wireless thingy while I do
Yuri,
It is not clear to me why the antenna should be isolated from the receiver, I
would prefer to keep the antenna and receiver on the same return, and isolate
that assembly from the rest of the world.
It is much easier to provide isolation on the supply, RS-232 and 10MHz (if you
use it)
I have version 8.5.3.6 (January 2007) on my web site (manual pages) that John
Vig sent me some time ago, not sure if there is a more recent one...
Didier
www.ko4bb.com
Sent from my BlackBerry Wireless thingy while I do
other things...
-Original Message-
If your concern is to clean up the harmonics, a crystal ladder filter is
probably not the best choice, a low pass filter would be easier to design,
would probably require no adjustment and be cheaper in parts with less effect
on the fundamental signal you are interested in.
If your concern is
Leigh,
A narrow filter around 10MHz is likely to show phase ripple in its passband,
and that will most certainly vary over temperature, not a good thing for ADEV,
that's why a LPF is preferred.
Also, most crystal filters may not be happy with the output level of a typical
OCXO, so you would
To: Didier Juges via Cox
Subject: RE: [time-nuts] FRS-C TTL / sine outboard filter question
Sent: Jun 23, 2010 8:41 PM
I do not understand why the passband ripple would be of any consequence in
the big (or small as we typically talk about) picture. During any
measurement interval
Steve,
You may want to check the Analog Devices MiniKit for ADuC702x-series.
http://www.google.com/search?q=Analog+Devices+MiniKit+for+ADuC702x-series
This kit includes a 24 bit ADC and integrated ARM processor in a small PWB with
all the tools and sample code to do what you want with very
, but the new kit is even
cheaper.
Didier
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of Didier Juges
Sent: Saturday, June 26, 2010 10:20 AM
To: 'Discussion of precise time and frequency measurement'
Subject: Re: [time-nuts
...@febo.com
Date: Sat, 26 Jun 2010 12:57:37
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Reply-To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Subject: Re: [time-nuts] EFC tracking
Didier Juges wrote:
Steve,
You may want
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