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
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
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
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
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
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
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
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
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
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
Doug,
If the manual is unencumbered, I would appreciate it if you could upload it
to my site http://www.ko4bb.com/manuals/
Thanks in advance,
Diier KO4BB
On Sat, Sep 22, 2012 at 6:45 PM, k4...@aol.com k4...@aol.com wrote:
Chuck,
Did someone send you a manual? I have a 6062A, probably very
you can probably cite from the time-nuts archive
jim s j...@jwsss.com wrote:
On 9/11/2012 10:01 AM, Richard (Rick) Karlquist wrote:
The SC cut crystal is generally credited to Jack Kusters
(of HP) and Errol Ernisse. The story was something like
Errol proposed the concept and Jack actually
KO4BB is busy cutting plywood and boarding windows, will be back to fun stuff
after Isaac...
Didier KO4BB
Robert Watzlavick roc...@watzlavick.com wrote:
I finally got a flash programmer so I uploaded all three ROM images
(TCXO, OCXO, Rub) for the Datum ET-6000 / 9390-6000 to the KO4BB
Another option is a low end laptop.
I use a Dell D400 laptop, with a 1.8GHz Pentium M and it draws about 20W from
A/C with the display blanked, which is the way an NTP server will be most of
the time.
The power brick rating assumes running the laptop AND charging the battery at
the same time.
I have bought similar items on ebay as bin for $5 with shipping.
Didier
paul swed paulsw...@gmail.com wrote:
impressive
Shame there is not a buy now. 1cent plus $4 shipping and you have to
wait 2
days to see if you won the bid. Or am I missing something?
Regards
Paul
On Mon, Aug 13, 2012 at
Chuck,
I have one of the original red box TB. It came with the Trimble Bullet antenna
that is specified in the TB datasheet.
The antenna works but gives extremely poor results. The TB works much better
with the Symmetricom antenna that is sometimes available on eBay.
The Bullet antenna
The coax is actually 50 feet of good quality 75 ohm cable that I bought for
this (rated for satellite TV). I have not measured the loss accurately but I
did check it at 2GHz when I bought it and it was good.
Didier
Tom Knox act...@hotmail.com wrote:
Hi;
Is your coax 50 or 75 ohm? Is it
that
bullet
antenna is the right thing to use. Somehow, I would think they should
know.
It is possible that they are prone to failure, I guess...
It is surprising to me that the only antenna I can get to work is a
Motorola
puck that is supposed to be too low gain (and is).
-Chuck Harris
Didier Juges
Looks like my bullet might be bad.. .
Didier
Charles P. Steinmetz charles_steinm...@lavabit.com wrote:
Chuck wrote:
I don't quite know what to say about that. Trimble seems to think
that bullet
antenna is the right thing to use. Somehow, I would think they should
know.
I normally use a
it and the Trimble Bullet antenna?
Steve K8JQ
On 7/30/2012 2:46 PM, Didier Juges wrote:
Chuck,
I have one of the original red box TB. It came with the Trimble
Bullet antenna that is specified in the TB datasheet.
The antenna works but gives extremely poor results. The TB works
much better
Link was messed up, should work now.
Didier
ramsayt...@windstream.net wrote:
I was unable to find this link. Going to his site directly I was not
able to find this mod. Do you have a suggestion how I can find it?
Regards,
Dennis A. Czelusniak
--
Sent from my Motorola Droid Razr phone with
Silver solder has a higher melting temperature so make sure you adjust your
soldering iron to the right temperature otherwise you will just make another
cold joint.
Also wick all the old solder before making a new joint with different solder.
Didier KO4BB
Ron Ward n6idl...@comcast.net
It is absolutely trivial to put a BNC on the A and well worth it.
HTTP://www.KO4BB.com/Test_Equipment/HP_3586_Modified.jpg
One less connector interface to worry about, and less risk of getting the cable
tangled up and breaking the adapter.
And it looks good.
The 3586 Option 003 has the same
It was very easy to replace the input connector on my 3586A, not sure about
the other versions.
Didier KO4BB
Bill Riches bill.ric...@verizon.net wrote:
I did install a bnc connector for input - pain - it took a few hours.
Save
yourself a lot of grief and purchase a Canare bcj-vwp bnc
Www. KO4BB.com/Test_Equipment/Thunderbolt/PulseStretching/
It does not have to be complicated
Didier KO4BB
Mike Feher mfe...@eozinc.com wrote:
Wow, that is indeed narrow. Only 1us out of a 1 second rep rate. That
is one
millionth of the rep rate. No wonder analog scopes will not catch it.
Narrow filters have high tempco on their group delay, so that's no good either.
Didier KO4BB
Bill Fuqua wlfuq...@uky.edu wrote:
Wow, I have not checked this list for some time. But there is a lot
said
about zero crossing detectors.
Lots and lots of replies, so many that I have not looked at
The Thunderbolt has no problem driving a 100 feet 50 ohm coax cable, aside
from the obvious impedance matching problem (the TB has maybe 5 ohms output
impedance), so I am not sure in what context that remark would apply.
Didier KO4BB
Hal Murray hmur...@megapathdsl.net wrote:
(From a
I don't think the problem is with the tbolt, see
http://ko4bb.com/Test_Equipment/CoaxCableMatching.php
There is a picture of the tbolt driving 50 feet of average quality 75 ohm
cable.
With the right termination, and if the cable is good enough, there should be no
problem.
If the cable is
What does that do to the focussing properties of the dish?
Didier KO4BB
Michael Baker mp...@clanbaker.org wrote:
Timenutters--
Along the lines of splitting time into small increments, there
is an interesting article in the May 2012 issue of the
IEEE Spectrum Journal.
It describes experiments
I believe ELF is more like 100 Hz, which can be received much deeper, so the
sub can stay at the bottom. 24kHz is VLF.
Didier KO4BB
Magnus Danielson mag...@rubidium.dyndns.org wrote:
On 07/16/2012 03:28 AM, Tom Miller wrote:
I believe they called that system a bell ringer. It let the
The picture is not of a Predator, it's a Global Hawk, a much larger
aircraft.
Didier KO4BB
On Jun 28, 2012 11:47 AM, Brooke Clarke bro...@pacific.net wrote:
Hi Dave:
The article shows a photo of a Predator, yet what the UoT guys did was
hack a toy helicopter that used only the L1 civilian
Correction: the UTC offset is part of the *primary* data packet that is
sent every second from the Thunderbolt, but as Tom pointed out, it has to
receive the information from the satellite(s) first, which can take 12.5
minutes (Thunderbolt Users Guide, version 5, 2003, page A-56, paragraph
Report
You are welcome to use my wiki of course. Like any other wiki, it is user
managed, so unless a bad problem happens, I do not need to get involved.
http://www.ko4bb.com/dokuwiki/doku.php
Didier KO4BB
On Sun, Apr 8, 2012 at 3:01 AM, David C. Partridge
david.partri...@perdrix.co.uk wrote:
Then
I have a Symetricom 58532A which I bought on eBay for $50 with shipping.
That is probably the best antenna you can get, and it won't break the bank.
I also have a Trimble Bullet, the antenna that was designed to go with the
Tunderbolt. It is a very good antenna also, but harder to find, and it has
http://science.slashdot.org/story/11/09/22/1841217/cern-experiment-indicates-faster-than-light-neutrinos?sdsrc=rel
Looks like they found the problem!
Didier KO4BB
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time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to
Mark,
If you feel adventurous, my GPSMonitor (written in C for the 8051) source
code is available. Development tools including C compiler are free.
Didier KO4BB
On Mon, Jan 30, 2012 at 11:47 AM, Mark Sims hol...@hotmail.com wrote:
The Tbolt does not have any sawtooth error or corrections.
You have to spend good money to get a GPS receiver capable of calculating
it's time and/or position more than once per second. I am not aware of that
being done for timing applications, but it is available for navigation GPS
receivers, such as those used to track race cars (for a race car, one
There is no pin-compatible replacement processor, at least not in a
compatible package.
I could use a C8051F300 which is available in a 14 pin SO package, but I
have not had time to switch the software over to that chip. It would not be
too hard to wire the SO-14 package to an existing board
http://www.bloomberg.com/news/2011-07-05/falcone-s-lightsquared-raises-additional-265-million-for-network-buildout.html
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and
Bob,
I do not see it :(
You can send it to me as email attachment if you prefer.
Thanks
Didier KO4BB
On Wed, May 18, 2011 at 11:36 PM, k6...@comcast.net wrote:
I've uploaded the Efratom FRS manual to the Recent_Uploads section of
ko4bb's site.
bob k6rtm
Sorry for the OT, but I know a lot of time-nuts subscribers use my site, so
I wanted to make sure you know what happened.
My site was infected by malware on March 1st. Google reported my site as
infected and sent me an email around 11:00 AM CST.
Several people notified me in the afternoon and
James,
The data stream is not that difficult to decode. You can look at the source
code for my GPSMonitor project:
http://www.ko4bb.com/dokuwiki/doku.php?id=precision_timing:gps_monitor
Didier KO4BB
On Tue, Mar 1, 2011 at 7:37 PM, James Fournier ja...@jfits.ca wrote:
Hello All, Has any one
It looks like my site has been infected by malware.
While I am cleaning it, I am setting up my backup site www.eds-fl.com with
the manuals.
There is about 40GB of manuals to upload, so that will take a while. I hope
to be done in a day or two.
I will post here when that is done.
I do not
On Thu, Dec 9, 2010 at 2:47 AM, francesco messineo
francesco.messi...@gmail.com wrote:
Hello,
if you are not afraid of a little microcontroller programming, why not
use a software DDS approach like this:
http://www.myplace.nu/avr/minidds/index.htm
or this:
How widely spread is your network?
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: Ralph Smith ra...@ralphsmith.org
Sender: time-nuts-boun...@febo.com
Date: Thu, 9 Sep 2010 11:37:46
To: time-nuts@febo.com
Reply-To:
We should start seeing used Loran transmitters on ebay pretty soon (!), and it
should not be too hard to build a timing receiver using this signal. If you
just want timing, one transmitter may be enough to cover the area of interest.
The low frequency Loran signals do go relatively well over
That earthquake was A LOT worse than reported...
Didier
--Original Message--
From: Poul-Henning Kamp
Sender: time-nuts-boun...@febo.com
To: bro...@pacific.net
To: Time-Nuts
ReplyTo: Time-Nuts
Subject: Re: [time-nuts] New Zealand, Iceland, Haiti
Sent: Sep 7, 2010 10:13 AM
In message
Yep :)
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: Mark J. Blair n...@nf6x.net
Sender: time-nuts-boun...@febo.com
Date: Tue, 7 Sep 2010 09:24:53
To: Discussion of precise time and frequency
My uW oven does that very well, but not consistently. It occasionally kicks my
laptop off line, but not every time. The oven frequency is not very stable and
it needs the right combination of temperature and phase of the moon to be
exactly at the bad spot long enough to disconnect. You also
Not unlike Cox. They generally provide great service, but when problems do crop
up (rare, but it has happened), the only thing that they guaranty is that you
will get their bill in the mail on time. Any more than that is just gravy...
Didier
Sent from my BlackBerry
Google time-nuts thunderbolt temperature sensor
Didier
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Peter Krengel
Sent: Sunday, August 29, 2010 6:22 AM
To: time-nuts@febo.com
Subject: [time-nuts] High resolution temperatur sensor ?
I'll dig them up and see if anyone could host them on a website. (Files
are quite large!)
It would be great if you could upload these to the Manuals page at
www.ko4bb.com.
That would be great. If the files are really big (over 100MB) and if your
internet access is not truly broadband, you
Maybe that explains something...
Didier
--Original Message--
From: Bill Hawkins
Sender: time-nuts-boun...@febo.com
To: Time-Nuts
ReplyTo: Time-Nuts
Subject: Re: [time-nuts] Better GPS
Sent: Aug 27, 2010 2:59 PM
You'd think that something at the edge of a continent that moved
up and down
It would be a benefit to society if someone were to take all the posts
on various schemes and circuits and edit them into a document/wiki/FAQ..
I have done it on occasion (selecting threads which I found were interesting
and put them in my Wiki (http://www.ko4bb.com/dokuwiki/). I have not been
Please note that Bruce Griffiths has documented many of the circuits that have
been referenced in time-nuts over the last few years in his pages on my web
site: www.ko4bb.com/~bruce/ and he occasionally keeps adding to it. The
time-nuts (and all others) are of course welcome (and encouraged) to
- but of course if all the other data is being received correctly,
there doesn't seem to be any logical reason why the DAC data would
be any different.
Thanks for the reply, but I'm still puzzled!
David, G4IRQ
On 18/08/2010 12:33, Didier Juges wrote:
When you say
I haven't fabricated a good excuse to want my own rubidium standard yet, but
I'll keep working on that. :)
Well, you need another reference that does not use the same principles to check
your first reference against.
That one worked for me.
Now I am working on the next one, because a man with
When you say will not display the DAC V value, do you mean the display is
blank, or it displays garbage?
Interestingly, the code that displays temperature and DAC voltage is
essentially the same, the only difference being which part of the data
string received from the Thunderbolt is processed,
reason why the DAC data would be any
different.
Thanks for the reply, but I'm still puzzled!
David, G4IRQ
On 18/08/2010 12:33, Didier Juges wrote:
When you say will not display the DAC V value, do you mean the display is
blank, or it displays garbage?
Interestingly, the code that displays
Alan,
You may want to compare to those:
http://www.ko4bb.com/Timing/GPS_Pics/
If they do not match and you eventually find out what they are, please let me
know and I will add them to my collection.
That goes for anybody who has identified, clear pictures of GPS receiver
boards, both sides
You may want to chec the manual, it's on my web site.
Didier KO4BB
www.ko4bb.com
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: k6...@comcast.net
Sender: time-nuts-boun...@febo.com
Date: Wed, 18 Aug 2010 19:22:32
You can upload it to my web site through the manuals upload page
http://www.ko4bb.com/cgi-bin/manuals.pl
Didier
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: Steve Rooke sar10...@gmail.com
Sender:
Actually this is a good argument FOR modeling well applied because you can
simulate parts that you cannot buy today but that your vendor will ship under
the same part number a few years down the road. Try doing that in the lab...
I have experienced it so many times it's not even funny. And that
Mil specs cover a number of things that are not always in the commercial specs,
but not always, and mil spec parts are going the way of the dodo. Nobody wants
to make them, except the local garage shop which does not mind selling you
$0.02 parts for $60 (quite common) and the worst is that
Once I had a batch of JANTX 2NA (with all the paperwork) that were PNPs.
They actually were marked JANTX 2NA. This was for a mil job in the 80's. We
did not fool around with the mil specs back then.
I was a young engineer then and not all that involved in the process, so I was
kept
This limits the compensations one can put into a pendulum clock unless you
actually build compensation for those effects too :)
I would think the timing of gravitational effects of the moon and the sun can
be easily predicted. I am not sure the amplitude of these effects can be
precisely
You do not need a switch, the T-Bolt Monitor only reads what's coming from the
T-Bolt, you just need to wire two connectors in parallel, and as long as Lady
Heather uses the same T-SIP protocol, which I believe is the case, you should
be OK.
Didier KO4BB
--Original Message--
From: Dr.
I have not seen an answer to that question (for people in the US) ?
I am waiting for the PWB, which I believe I paid for, and I am planning to
buy or make (have not looked into that yet) a PIC programmer, since it looks
like I may get some mileage out of that anyhow.
No rush, but there is no
Attenuating the control voltage near the point of use is always a good idea
when you are concerned about common mode or ground noise and particularly when
you have excess dynamic range, but you have to consider the noise added by the
divider. Some filtering may be required, and use as low a set
The only way to have that kind of meaningful accuracy with an on-air signal
outside of ground wave range (a.k.a FMT) is to average over a long time (days)
to average out the shift due to variations in propagation. The altitude of the
layer reflecting the signals changes over time, so the
I like the 3586 a lot, it's amazing what you can do with it. However, if you
send the audio (beat note) to a computer or other instrument, keep in mind that
the BFOs are not phase locked to the reference, they are just free standing
crystal oscillators, and they may be off by a few Hz. If you
Check
http://www.ko4bb.com/Test_Equipment/GPIB.php
Didier KO4BB
Sent from my BlackBerry Wireless thingy while I do other things...
-Original Message-
From: Mark Spencer mspencer12...@yahoo.ca
Sender: time-nuts-boun...@febo.com
Date: Sat, 24 Jul 2010 18:15:20
Congratulations Joe!!!
Didier
-Original Message-
From: time-nuts-boun...@febo.com
[mailto:time-nuts-boun...@febo.com] On Behalf Of J. L. Trantham
Sent: Tuesday, July 06, 2010 11:44 PM
To: 'Discussion of precise time and frequency measurement'
Subject: [time-nuts] 5061A Problem
That could be done easily with my GPSMon project, just add code :)
The project decodes the TSIP binary format, so it would not be so hard to
decode the packets you need. At the moment, the project does not talk to the
TBolt, and I forgot if the Tx routines are in the code. If they are not and
they work, or
actually confirm they took effect. Either way it should fit in a pretty small
chip.
Thanks!
Bob
On Jul 7, 2010, at 9:55 PM, Didier Juges wrote:
That could be done easily with my GPSMon project, just add code :)
The project decodes the TSIP binary format, so it would not be so hard
Daniel,
This has been covered previously on time-nuts, a look through the archives
would probably answer your question to a large extent. I do not remember the
time frame though, probably a year or more ago.
Sometimes, googling around that kind of search term does return time-nuts
postings :)
@febo.com
Subject: Re: [time-nuts] Motion effects on accuracy of GPS pps
Thanks for the response Björn. Also thanks to Didier Juges for pointing
out that this has been covered on a previous thread. I'll go and find it
in the history.
Unfortunately the device will be used in urban areas so some
-archive.com/time-nuts@febo.com/msg08038.html
You can scroll back and forth from there, the thread drifted quite a bit but
was fascinating, at least to me :)
Didier
--Original Message--
From: Daniel Davson
To: Didier Juges via Cox
Subject: Re: Re: [time-nuts] Motion effects on accuracy of GPS
Bob,
Do you have a part number to suggest a quick glance a the TI web site did not
show up any parts in that category...
I found a Cirrus Logic ADC with chopper front end and good low noise specs,
CS5530.
It's a 24 bit ADC but the ENB (noise free) drops to 15 at 1ksample/sec. Even at
the
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
I am not sure how to translate the IMD specs into integral or differential
non-linearity, but from what I have seen, IMD specs are not significantly
better for 24 bit sound cards than for the older high-end 16 bit models, when
high-end 16 bit models were available. Noise specs are better, and
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
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-
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 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
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
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