On 2/19/13 10:58 PM, Hendrik Dietrich wrote:
Good morning Paul,
First: I almost spilled my coffe as you bear a similar last name as a
guy at a national research lab who does exactly such things :)
Even when it makes your ECG preamplifier free for other things, I advise
you to use another
On 2/19/13 4:58 PM, Paul Cianciolo wrote:
Hello Folks,
I am working on a project intended to convert an analog ECG signal to
a voltage proportional the heart rate, The actual electrodes
instrumentation amp is pretty much working fine so no worries
there.
The problem is, and here is where the
I need to generate a sequence of pulses at around 1 Hz with a 1/f
characteristic (human heartbeat, as it happens). I'd like to do this
using software and a timer, so I'm looking for a clever algorithm using
a random number generator to do it.
I could take the phase noise spectrum and turn
uniform pulse rate.
There's some faster cheap processors out there that I could drop in, as
well: teensy3 with the 48MHz Cortex is pretty powerful.
On Feb 15, 2013, at 7:43 AM, Jim Lux jim...@earthlink.net wrote:
I need to generate a sequence of pulses at around 1 Hz with a 1/f
On 2/15/13 5:37 AM, Bob Camp wrote:
Hi
Ok, how about a nice simple table? Something in the 500 to 4K entries
shouldn't repeat often enough to be noticeable. Each entry probably can be a
byte.
Bob
Yes.. that might work..
Or, for that matter, I believe you could do it by randomly
On 2/15/13 6:21 AM, Bob Camp wrote:
The timing does relate to multiple valves, so it's not quite as simple as a
single rate. The time delta's for the other stuff are all pretty short, so you
may or may not be planing to randomly drive them as well.
It all depends on how fanatic you get about
On 2/11/13 10:20 PM, Chris Albertson wrote:
On Mon, Feb 11, 2013 at 10:04 PM, David J Taylor
david-tay...@blueyonder.co.uk wrote:
Anything which works on the Raspberry Pi must be fairly lightweight! G I
don't think that basic Apache would be too much to manage, and many folk
have used it:
On 2/12/13 10:11 AM, Didier Juges wrote:
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
I'm intrigued by the possibility of using a lightweight web server to
provide a management/user interface to test equipment or appliances
(e.g. like the NTP server recently discussed, or a box with mixers and
counters).
I've built some web interfaces to very small things using Arduinos and
On 2/10/13 12:40 AM, David J Taylor wrote:
- although I've never used it, I do like Chris's suggestion of power over
Ethernet. I see dozens of choices in Amazon's lists - is there a standard
for the power adapter and level?
[]
==
To clarify, now I've done a little
On 2/10/13 8:22 AM, Chris Albertson wrote:
On Sun, Feb 10, 2013 at 12:40 AM, David J Taylor
david-tay...@blueyonder.co.uk wrote:
- although I've never used it, I do like Chris's suggestion of power over
Ethernet. I see dozens of choices in Amazon's lists - is there a standard
for the power
On 2/4/13 2:09 PM, Stanley wrote:
If a fiber-optic cable had temperature sensors either installed with or
embedded inside of this could make for better modeling changes in delay making
more accurate transfer of time and frequency possible. With fiber to tower
installs now under way to provide
On 2/4/13 2:39 PM, Bob Camp wrote:
Hi
Consider that cost to manufacture the cable goes up as you put stuff in it. You
not only need sensor packages, you also need to connect them so they can report
data. Unless the sensors are optically powered and linked, they would
compromise the inherent
On 2/2/13 5:07 AM, Grant Hodgson wrote:
GPS has already flown in space several times; one of the well-publicized
occurrences is when NASA sponsored an experiment to put a 6-channel
Trimble receiver on the ill-fated AO-40 amateur radio satellite which
launched in 2000.
This satellite had a
On 1/31/13 1:09 PM, Chris Albertson wrote:
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.
What are the limits of your hand held unit or what are the limits of
GPS in general.
On 1/31/13 8:37 PM, Rick Harold wrote:
To time experts/EE's.
I would like to triangulate a position of a device which moves using 3
fixed positions devices of known location.
The idea is to have these operate on 915mhz or 434mhz or 2.4ghz or
appropriate frequency.
These two type of devices
On 1/30/13 8:28 PM, Chris Albertson wrote:
For once the best is also cheap: Batteries.
But not all batteries are the same. You want one with low internal
resistance, so a lead acid flooded battery will be the best.
Most NiCd have very low internal resistance.. much lower than lead acid.
I spent a couple frustrating hours debugging a test setup with
programmable power supplies and counters (to make automated measurements
of freq/Vtune on some VCOs, as well as Vsupply pushing)
I'm using something hacked from the sample Python code and the Prologix
Ethernet device (which has
On 1/26/13 11:23 PM, Chris Albertson wrote:
On Sat, Jan 26, 2013 at 2:12 PM, J. Forster j...@quikus.com wrote:
Unless you are doing fundamental physics research, are you sure you need a
cryo temperature standard?
You are right. What I asked I should have said that 1% accuracy would
be good
of gear.
Actually. I've been thinking about going to a prologix per instrument model.
Then it's just an ip address per instrument
On Jan 27, 2013, at 8:33, Prologix supp...@prologix.biz wrote:
Hi Jim,
We recommend starting with the procedure described in the FAQ to verify
connectivity
On 1/27/13 9:30 AM, Peter Gottlieb wrote:
At work we simply use multi port serial cards (*no* USB intermediary) or
Ethernet to serial adapters. Any use of USB for critical test equipment
was pretty much banned here years ago.
Why the proscription against USB?
Because of difficulty with USB
or 100s of millisecond timing and shoving data back and forth..
On Sun, Jan 27, 2013 at 1:48 PM, Jim Lux jim...@earthlink.net wrote:
On 1/27/13 9:30 AM, Peter Gottlieb wrote:
At work we simply use multi port serial cards (*no* USB intermediary) or
Ethernet to serial adapters. Any use of USB
On 1/27/13 11:28 AM, Peter Gottlieb wrote:
It came down to startup issues. If every fifth time the system was
turned on it wouldn't initialize properly and not see an airflow or
whatever sensor, it required the calling of a tech from the test group
to come over and get it going. We run Labview
On 1/24/13 7:24 AM, Mike S wrote:
On 1/23/2013 3:34 AM, Magnus Danielson wrote:
On 01/23/2013 02:32 AM, Mike S wrote:
Can you have a Cs under zero acceleration and at zero temperature, the
only conditions for which the second is defined? Since most metric units
are derived from the definition
On 1/24/13 8:13 AM, John Nelson wrote:
I hesitate to ask this question on here since it's perhaps more one for
position-nuts rather than time-nuts. My excuse is that it involves a
Thunderbolt ;-)
I've been a happy user of a Thunderbolt for a while as an accurate time and
frequency source but
On 1/23/13 12:41 AM, Hal Murray wrote:
mspencer12...@yahoo.ca said:
This URL goes into some of the issues involved in using 75 ohm coax in a gps
system. I do acknowledge that several GPS manufacturers have promoted the
use of 75 ohm coax so some of the conclusions might be arguable..
If the
On 1/23/13 6:48 AM, David Kirkby wrote:
There's a fairly interesting (to me at least), discussion on an
Agilent forum devoted to the calibration of vector network analyzers.
http://www.home.agilent.com/owc_discussions/thread.jspa?threadID=34809tstart=0
The title of the thread is Coefficients
On 1/23/13 7:26 AM, li...@lazygranch.com wrote:
For a single frequency use like GPS, the impedance should be close to the
target. It is true for scanners and such, 50 ohms is quite nominal. (This
notion of DC to daylight and maintaining 50 ohms is fantasy. ) But for a GPS,
you know exactly
On 1/23/13 8:50 PM, Jim Lux wrote:
On 1/23/13 7:26 AM, li...@lazygranch.com wrote:
For a single frequency use like GPS, the impedance should be close to
the target. It is true for scanners and such, 50 ohms is quite
nominal. (This notion of DC to daylight and maintaining 50 ohms is
fantasy
On 1/23/13 9:45 PM, li...@lazygranch.com wrote:
I doubt the impedance would be designed so nobody gets a right match. Anyway,
the geometric mean, which is how you would do such a compromise is 61.24 ohms.
I suspect that it's more like.. the mfr builds a prototype that has the
right
On 1/21/13 10:59 PM, Chuck Forsberg WA7KGX N2469R wrote:
RG-6 used for satellite TV has much lower loss than RG-58,
and is much cheaper and easier to work with than Heliax or LMR400.
And has a foil shield (if not multiples) with 100% coverage.
___
On 1/22/13 9:08 AM, Joe Leikhim wrote:
John;
You might look into building your own, _scaling up_ from a G3RUH design
(2.4 GHz)
note that they were illuminating a 60 cm dish in those experiments,
that's not a very big reflector for 12.5 cm wavelength at 2.4 GHz. not
even 5 lambda. I'm not
On 1/21/13 9:14 AM, jmfranke wrote:
Would anyone happen to have a LHCP patch antenna, with or without
preamp, they would be willing to sell? I want to use it as the feed for
a 4 foot diameter F: 0.375 dish antenna for a dedicated WAAS receiving
set up.
why a patch? Patches are nice when
On 1/17/13 6:22 AM, Bob Camp wrote:
Hi
Most cheap GPS's these days have user friendly firmware update capability.
That's been true for quite a while. I'd be amazed if the higher end stuff
didn't make updates an easy thing. Bugs in GPS code are not exactly
uncommon.
The real issue is the need
On 1/11/13 7:00 AM, Nathaniel Bezanson wrote:
J. L. Trantham wrote:
Is there a way to connect a parallel port to a computer via USB?
Not a device that shows up as 'USB Print Support' but, instead,
shows up in Device Manager as an LPT port? I have been able to do
it via PCMCIA to Parallel Port
programmed
in a reasonable time period would probably need more power.
Jim
http://www.ebay.com/itm/261149380462
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On 1/6/13 8:56 PM, gary wrote:
There is an open source equivalent of Matlab called Octave.
Yes..we use it too, and for anyone who uses Matlab, Octave is nice to
have as well. For instance, we have a centralized license server for
Matlab, and if you're incommunicado, you're stuck, but with
On 1/6/13 9:26 PM, Hal Murray wrote:
jim...@earthlink.net said:
Precisely.. but I'd just as soon not be in the PC integration business,
finding boards to plug into a mobo, etc. I was wondering what folks have
used (or seen used) in this sort of usage model.
Google for embedded PC and/or mini
On 1/7/13 4:30 AM, Bob Camp wrote: HI
Well if you are getting it done in seconds on Matlab, then you likely
don't need Matlab very badly. Around here a typical Matlab setup is
indeed CPU bound for a *lot* longer than that during a normal work day.
Two or three hours a day is not at all
On 1/6/13 5:43 PM, Chris Albertson wrote:
There is not hottest ticket. It depends on what you need. The TI
launch pad is less then $5 shipped which makes it really popular.
Somehow I suspect the MSP430 launchpad won't run windows/Linux and
Matlab, eh?
If
you need loots of compute power
On 1/6/13 5:52 PM, gary wrote:
This might be a good place to start looking.
http://beagleboard.org/project/BeagleTick/
I got a beagleboard mx, but it is for a different project. I'm not up to
speed on it enough to comment if this is the best solution. I can tell
you the hardware design and
On 1/6/2013 5:59 PM, Jim Lux wrote:
On 1/6/13 5:52 PM, gary wrote:
This might be a good place to start looking.
http://beagleboard.org/project/BeagleTick/
I got a beagleboard mx, but it is for a different project. I'm not up to
speed on it enough to comment if this is the best solution. I
On 1/6/13 6:09 PM, Bob Camp wrote:
Hi
Ummm, er you want to run Matlab and you are likely paying $100 an
hour to whom ever is waiting on the machine. My *guess* is that a
micro board of what ever flavor will do an arbitrary Matlab run in
maybe 30 days.
Yes.
But any of a zillion PC clones
On 1/4/13 10:25 AM, Rick Karlquist wrote:
Chris Albertson wrote:
My question is about the phase noise of the final 16MHz signal. Do
crystal filters clean up the signal. It seems that after several
16MHz crystals in series the output should look a lot like an XO.
For offsets out to 100 Hz
On 1/4/13 11:34 AM, Ed Palmer wrote:
They are neat toys, aren't they? :-) I discovered them a couple of
years ago. Since then I've collected a few from ebay to play with.
They're oddball units with no documentation, but they weren't too hard
to decipher. I even cobbled together a phase-lock
On 1/3/13 12:53 AM, Poul-Henning Kamp wrote:
In general, you should reuse as much code as you can, life is too short
to write another UDP checksum subroutine.
You captured it exactly..
The thrill of implementing sin() is long past.
Heck, I'd be happy with something that ran
On 1/2/13 11:37 AM, Poul-Henning Kamp wrote:
Actually, the OS is not important, floating point support is.
floating point support in the sense that the compiler supports it and
generates appropriate code to use software FP or hardware FP as available?
Or you need HW floating point for
On 1/2/13 4:46 PM, Bob Camp wrote:
Hi
That's the point I've been trying to make for about a month now. At some point,
for a hobby project, the cost of the CPU becomes irrelevant. In my book, once
the CPU goes below the price of lunch at McDonalds, it really doesn't matter
much.
yes..
On 1/2/13 5:34 PM, Tom Harris wrote:
+1 for Forth!
+1 for your opinions on PICs AVRs. We can buy low end NXP ARM Cortex M0
chips (e.g. LPC1113) for less than the PIC18 we were using before, and it
has a real compiler and (unlike the real world) evidence of intelligent
design!
Do you really
On 1/1/13 12:16 PM, Poul-Henning Kamp wrote:
In message aa21d17c-0ff4-4b22-b3a3-43ac2b9da...@rtty.us, Bob Camp writes:
I'm not bashing the Arm parts, [...] They worry about every uA of
current drain
True story:
Many years ago when the very first ARM silicon arrived and they started
On 12/30/12 8:28 PM, Bob Camp wrote:
Hi
Indeed, there will always be some EMF into the EFC from some field. You can
never really get rid of a loop with some cross section in the EFC circuit. Most
of us don't get to worry about 1x10^-16 at 1,000 seconds on our OCXO's….
Yes. I think it's not
On 12/31/12 12:55 AM, Hal Murray wrote:
jim...@earthlink.net said:
When designing the system to do coherent two way ranging to the Juno
spacecraft orbiting Jupiter, we found that the rotating magnetic field
(because the spacecraft spins at 2RPM in Jupiter's magnetic field) was
enough
On 12/31/12 7:56 AM, Bob Camp wrote:
Hi
I suspect that your ion standard will have some issues from magnetic field.
Quartz it's self has no magnetic sensitivity. Most atomic gizmos have
sensitivity as part of their basic physics.
yes.. shielding of the physics package is part of the
On 12/31/12 8:13 AM, Magnus Danielson wrote:
On 31/12/12 16:56, Bob Camp wrote:
Hi
I suspect that your ion standard will have some issues from magnetic
field. Quartz it's self has no magnetic sensitivity. Most atomic
gizmos have sensitivity as part of their basic physics.
All atomic clocks
On 12/30/12 11:35 AM, Attila Kinali wrote:
On Fri, 21 Dec 2012 09:53:51 -0800
Said Jackson saidj...@aol.com wrote:
Volker, I wonder if you also see fan-induced spurs in the phase
noise from 1Hz to 100Hz. I would not be surprised if the fan
vibration adds significant spurs to the 10811A
On 12/30/12 8:03 PM, Bob Camp wrote:
Hi
They are using some pretty major fields in that paper. As they point out, high
level tests likely do not extrapolate well to low level performance. Their data
shows the impact diminishing quickly as the field drops.
If you accept their 1x10^-11 per
On 12/28/12 9:14 PM, Michael Perrett wrote:
Bob,
That is simply not accurate - if the solution rate is 1/second, then all
parameters are solved in that time frame. There are 4 indpendent variables
and minimal processing power is required to solve all four equations.
Although I am not very
On 12/29/12 6:34 PM, Bob Camp wrote:
Hi
The gotcha is that often the navigation and timing receivers are identical
in terms of hardware. There is no upgraded hardware in the timing device.
When you put a receiver into position hold, you are telling it I don't care about
the location
On 12/27/12 11:48 AM, Attila Kinali wrote:
On Thu, 27 Dec 2012 11:30:37 -0800
Jim Lux jim...@earthlink.net wrote:
So, what about the USB-Ethernet dongles? (I use them a lot at work to
add a second interface for a laptop in test equipment setups, talking to
a Prologix, for instance)
A lot
On 12/28/12 7:56 AM, Bob Camp wrote:
Hi
Everything I've seen on the Adruino are single chip wonders. They encapsulate
the entire TCP/IP stack on the external chip. That will make getting at anything pretty
tough.
Well, they also do UDP..(at least the Wiznet 5100 does)..
I was wondering if
On 12/28/12 9:34 AM, Chris Albertson wrote:
On Thu, Dec 27, 2012 at 1:36 AM, Hal Murray hmur...@megapathdsl.net wrote:
One idea that I like is to first get a large FPGA. Then you load in a
soft CPU and then you run an OS and NTP on the soft CPU. Inside
the softCPU the counter is
On 12/27/12 11:17 AM, Chris Albertson wrote:
On Thu, Dec 27, 2012 at 10:55 AM, Dennis Ferguson
dennis.c.fergu...@gmail.com wrote:
The reason you can't distribute ns level time over a network to normal
NTP clients is because of the random queing that happens inside the
client's ethernet
On 12/20/12 11:16 PM, Hal Murray wrote:
Can you create an executable for windows?
I know next to nothing about Windows. (and don't have access to any Windows
machines)
Others have reported that Python works on Windows.
I use python all the time on Windows (and unchanged from Python
On 12/20/12 11:57 AM, David McGaw wrote:
The Mayan calendar, if that is what you are talking about, rolls over
at the solstice - Dec. 21, 2012 11:12 UTC.
Hunt back in the archives a couple days...
The long count rollover isn't solstice linked.. it's just a sequential
day count (think
On 12/19/12 4:12 PM, Sanjeev Gupta wrote:
On Thu, Dec 20, 2012 at 1:28 AM, Tom Knox act...@hotmail.com wrote:
Does anyone have ideas on how I can trigger my camera to capture the end
of the world roll over on my clocks.
I need to know something even more basic: Did the Mayans correct for
On 12/18/12 12:23 AM, Gerhard Hoffmann wrote:
Am 18.12.2012 03:01, schrieb David:
That is the stuff but Tektronix had some with an even smaller
diameter. It would be nice to have a new source as I would hate to
cannibalize oscilloscopes for it.
Could be Sage Wireline. Also used for couplers
On 12/17/12 11:21 PM, Hal Murray wrote:
Cond. Material Magnet Wire Helix
(What is magnet wire, and what does helix mean and how does it effect
coax?)
Magnet wire is enamelled wire (usually copper).
I'm familiar with that usage, but I don't know why it's interesting in the
context
You knew it would be coming..
A discussion over lunch brought up the question of precisely WHEN this
Maya calendar rollover/civilization ending event would occur. It's not
enough to just say dec 21st.. Does the event occur at the beginning of
the day, end of the day, in which local time
On 12/17/12 12:03 PM, Don Latham wrote:
And it's on my birthday, too. So should I open my presents at breakfast
instead of dinnertime/ Will I get cake???
:-)
merry Christmas to all of you...
As the sun rises over the heel stone at Stonehenge, I should think..
After all:
In ancient times...
On 12/17/12 12:33 PM, kevin.bi...@qc.cuny.edu wrote:
In the ethnographic record, the solstice is not a point in time, but the
day of the sun's shortest path. I'm not sure of what the start of the day
was. The Mayan word for day, kin, seems to refer to the entire movement
of the sun from
On 12/17/12 4:02 PM, Mark Sims wrote:
BTW, Lady Heather has support for several versions of the Mayan and Aztec
calendars. Also Druid, Herbrew, Islamic, Indian, and many others.
so we can have a GPS disciplined rollover of the long count?
On 12/17/12 5:39 PM, David wrote:
I wish there was an source for helically wound shielded differential
transmission line like the type used in later analog oscilloscopes.
The only place I know where to find it is oscilloscope part mules.
You mean RG65
On 12/17/12 9:40 PM, Hal Murray wrote:
jim...@earthlink.net said:
You mean RG65 http://www.awcwire.com/ProductSpec.aspx?id=M17/
34-RG65-Coaxial-Cable or RG186 http://www.awcwire.com/ProductSpec.aspx?id=RG1
86-Coaxial-Cable
Interesting stuff. Thanks.
RG-65 says no longer available. It also
On 12/15/12 2:16 PM, Scott McGrath wrote:
In a prior life we had a CDMA timing receiver for NTP which used VZ for its
source
On Dec 15, 2012, at 12:18 PM, Graham / KE9H time...@austin.rr.com wrote:
You should switch to Verizon.
They are inherently accurate to milliseconds.
Sub micro-seconds
On 12/14/12 8:47 PM, Hal Murray wrote:
saidj...@aol.com said:
Time-Nuts, anyone willing to write this for the benefit of all?
Does python run on Windows? If so, give me samples of input data and what
you want as output.
Sure.. there's several flavors.. I use Active Python
On 12/9/12 10:14 PM, DaveH wrote:
http://www.scmagazine.com.au/News/325731,researchers-find-crippling-flaws-in
-global-gps.aspx
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On 12/9/12 10:14 PM, DaveH wrote:
http://www.scmagazine.com.au/News/325731,researchers-find-crippling-flaws-in
-global-gps.aspx
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On 12/9/12 5:38 PM, Bob Camp wrote:
HI
Princeton was part of EGG for quite a while. EGG bought out Perkin Elmer in the 90's. The
EGG name was not as warm and fuzzy as Perkin Elmer. The switched over the name of
the combined company to Perkin Elmer a bit after they got together.
P-E is also
On 12/8/12 9:30 AM, johncr...@aol.com wrote:
Instead the discussion has centered on what microprocessor (of a hundred
that would work)
and how to eliminate glue logic and and a few analog parts to save
money. This is silly - silicon is
CHEAP.
Silicon is cheap, but for one-off fabrication by
On 12/6/12 1:56 PM, Bob Camp wrote:
Hi
The single best thing about a TBolt is Lady Heather.
Consider how many years it's taken to get it to where it is today. Consider
how many people have worked extensively on it. It's a wonderful thing to
have available.
Could you make a homebrew gizmo look
On 12/6/12 11:12 PM, Hal Murray wrote:
Suppose you just implement a simple bang-bang control.
Suppose the EFC is 1 volt and the frequency is correct but the GPSDO
phase is a bit early relative to the GPS PPS. So the FF says early
and the software says go-faster. That keeps happening for
On 12/6/12 5:01 PM, Bob Camp wrote:
Hi
The solution to the problem is well known in several forms. Cost is below $5
for pretty much all of them. No need to re-invent the wheel. The gotcha is that
you can't do it 100% with internal CPU peripherals. You will need *some* glue.
I think that's
On 12/6/12 11:20 PM, Don Latham wrote:
Good thought, Bob. AD9548 $27, eval board a whopping $250, get a
thunderbolt :-). The eval board has a lot of SMA's on it...
This is a general problem with eval boards these days.. They provide a
lot of functionality on the board to make it easy to
On 12/6/12 1:06 AM, Chris Albertson wrote:
Yes. The idea was the simplest GPSDO that can be build with no PCB around
an Arduino. We already know how to build compllelx and expensive GPSDO.
That is too easy.
I think you can use the PWM DAC on the Aruino to drive the OCXO. The
bandwidth of
On 12/6/12 4:42 AM, Bob Smither wrote:
On 12/05/2012 02:32 PM, M. Simon wrote:
Do you have a link for the nifty site?
This one is not just for the west coast, but has good reporting of grid
conditions:
http://fnetpublic.utk.edu/index.html
They have several real time graphic and table
On 12/6/12 9:45 AM, Dale J. Robertson wrote:
Arduino is Dirt Cheap!
And available over the counter retail at hundreds of Radio Shacks..
You get an idea during the day, and you can run out and buy one right
then.. (yes, you can mail order, but the fastest turnaround is a few
days, unless you
On 12/5/12 12:06 AM, Bruce Griffiths wrote:
Hal Murray wrote:
albertson.ch...@gmail.com said:
What is the simplest phase detecter that could work? I think only
that, and
then a duouble oven crystal from eBay, a GPS and and Arduido.
You also need a good D2A to drive the EFC on the osc.
A
On 12/5/12 2:45 PM, Marek Peca wrote:
This last idea is interesting... could be simulated by Matlab or similar.
It is known to work in ordinary non-linear transistor-based mixers. It
will produce more messy spectrum than double-balanced mixer, however,
for this purpose and completely within
oscillators, all
with their own stiffness coupled by a complex network of transmission
lines with propagation delays and mismatch.
On 12/3/2012 8:12 PM, Jim Lux wrote:
On 12/3/12 6:34 PM, Hal Murray wrote:
li...@lazygranch.com said:
I have one of those key fobs. Does the code somehow inform
On 12/4/12 4:28 PM, Bill Hawkins wrote:
Sorry about this, Tom, but there's some misinformation here.
I wasn't reading this until I saw your posting.
-Original Message-
From: Jim Lux
Sent: Tuesday, December 04, 2012 7:58 AM
On 12/3/12 9:59 PM, gary wrote:
I was meditating a bit
On 12/3/12 9:32 AM, dlewis6767 wrote:
I agree, Bob.
Like the billboard on the side of the highway says: - Does Advertising
Work? JUST DID -
The bad guys can read this list same as the good guys.
Security through obscurity never works in the long run. Much better to
discuss
On 12/3/12 6:34 PM, Hal Murray wrote:
li...@lazygranch.com said:
I have one of those key fobs. Does the code somehow inform the power the be
about the drift in the built in clock? Or is the time element of the code so
sloppy that the drift is acceptable?
The magic number changes every second
OK, I'll bite. Why?
Jim
I've never done it using to the RTC crystal, but I do it quite
frequently in my Day Job to Ethernet controllers on those same pc mother
boards.
-Eric
On Fri, Nov 30, 2012 at 4:10 PM, Sarah White kuze...@gmail.com wrote:
On 11/30/2012 6:30 PM, Eric Garner wrote
On 11/30/12 4:58 PM, John Ackermann N8UR wrote:
On Nov 30, 2012, at 7:42 PM, John Ackermann N8UR j...@febo.com wrote:
In this case, you're not looking for the RTC but rather the clock that drives
the COU
Read CPU. Stupid iPad keyboard.
I was wondering.. Clock Oscillator Unit? Cryptic
On 11/26/12 10:11 AM, Demian Martin wrote:
I asked Wenzel about mixers for phase noise measurement and they directed me
to Marki Microwave as what they use:
http://www.markimicrowave.com/2770/Mixers.aspx I have not obtained or
tested any myself but it's a pretty solid recommendation I think.
On 11/25/12 4:30 PM, Hal Murray wrote:
Suppose I have an A/D running at 1 MHz. The standard simple minded approach
is that it will work for any input signal with a bandwidth up to 1/2 MHz. We
usually think of that in the baseband, but it also works for, say 1.25 to
1.5 MHz. The input signal
On 11/25/12 5:19 PM, Said Jackson wrote:
Hal,
Check out the Analog Devices website. Good info on DDS Dacs there.
You want to stay a bit away from the 1/2fs Nyquist limit in your DA. The reason
is the image coming down from your 1MHz clock.
If you output say 0.45MHz, you have an image at 0.55
On 11/24/12 8:28 AM, Alan Melia wrote:
Joe the reason why its not so uncommon may not be obvious in the US :-))
12.8MHz is used as a reference for commercial and amateur PLLs in Europe
where the common channel spacing is 12.5kHz (/1024) or 6.25kHz (/2048).
This may mean that 12.8MHz oscillators
On 11/22/12 12:12 PM, Larry McDavid wrote:
I realize this modulation scheme change is perceived as a sensitive
subject. But, really, since the full scheme is fully disclosed no
company has a monopoly on its use.
Actually, I think the developing company does have patents on some of
the
I am interested in one.
Jim Cotton
On 11/19/12 3:28 PM, Daniel Mendes wrote:
At this interest rate you´ll sell more units than Apple will sell
Iphone 5´s... ;)
Daniel
Em 19/11/2012 18:15, cdel...@juno.com escreveu:
As Bert mentioned once the amount if interest is established purchase
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