On Sat, 8 Apr 2017 16:30:38 -0400, you wrote:
>David wrote:
>
>> I mentioned this in connection with some manufacturers using gold
>> doping in transistors which would not normally be expected to have
>> gold doping. So you end up with a bunch of lessor named 2N3904s
On Sat, 8 Apr 2017 21:43:31 +0200, you wrote:
>Am 08.04.2017 um 17:52 schrieb David:
>>
>> If they are not being tested, then where is the maximum specified
>> leakage number coming from? For a small signal bipolar transistor it
>> will typically be 25nA, 50nA,
They are relevant when a high input impedance buffer is used making it
easier to add series/shunt overload protection. Protecting against
400 volts and higher is feasible this way.
Adding overload protection to a 50 ohm input is an interesting
challenge but it can be done. Precede the 50 ohm
I have seen some proposals to require VAR capability in photoelectric
installations but how feasible is that? I cannot imagine utility
customers being pleased with having to pay extra for such a nebulous
to them capability.
I could see the utility companies pushing it as a requirement in lieu
of
On Wed, 5 Apr 2017 02:40:13 -0400, you wrote:
>David wrote:
>
>> So collector-base junctions make good low leakage high voltage diodes
>> although they are slow
>
>I guess it depends on what one means by "slow" and "fast."
I was referring to within
Some incandescent lamps can emit RF.
http://www.rexophone.com/?p=1081
http://www.radiomuseum.org/forum/rustika_lightbulb_fm_measurements.html
On Tue, 11 Apr 2017 18:09:52 +, you wrote:
>Apparently fluorescent tubes continuously emit a lot of other microwave
>signals. I once built a
If the modulation is phased locked to the carrier which is common,
then that suggests two other ways to extract the timing from the
carrier without interference from the modulation.
1. Integrate the phase comparison over a whole number of modulation
cycles; the modulation will then cancel out.
On Thu, 6 Apr 2017 22:23:43 -0400, you wrote:
>David wrote:
>
>> I know one thing to watch out for if you are looking for low
>> leakage is gold doping
>
>Anything that increases carrier mobility increases leakage current (all
>else equal -- i.e., for each
On Fri, 7 Apr 2017 01:06:17 -0400, you wrote:
>Another thing to watch out for if you need very low leakage, is if the
>package is transparent. All junctions are photodiodes.
>
>Maybe it's less of a problem now with SMTs, than it was with glass body
>diodes or translucent transistor packages.
>
On Fri, 7 Apr 2017 04:09:38 -0400, you wrote:
>David wrote:
>
>>> what doping is used for PNP RF transistors and saturated switches
>>> if it is not gold? Does it also increase leakage?
>
>I replied:
>
>> Gold doping doesn't affect the speed of BJTs i
On Wed, 12 Apr 2017 20:18:38 -0700, you wrote:
>On 4/12/17 7:14 PM, Richard (Rick) Karlquist wrote:
>> 10.9 MHz is likely the B-mode of the SC cut.
>> (It's a different mode, not a different overtone).
>> This mode has a tempco of 20 ppm and is used
>> to do thermometry.
>>
>> IMHO, there is NO
High end frequency counters usually go to some effort to prevent
synchronization between the input signal and the gate. Some DSOs do
as well. Synchronization can exasperate certain errors and
asynchronous operation provides better results when many measurements
are averaged.
On Tue, 25 Apr 2017
I have never been able to find a reference to them on the internet but
there was a similar product intended for TO-99 packages that could be
used with operational amplifiers.
On Mon, 5 Jun 2017 08:35:35 + (UTC), you wrote:
> The Crystal heater clip wasa Murata "Posistor" soldered onto a
My Racal-Dana 1992 is the same way; its time interval mode is limited
to the 1 nanosecond interpolated resolution of the counter.
Some counters support time interval averaging which will produce much
much higher resolution but often they have a minimum time interval.
If the transmission line to
Possibly not of immediate concern to time-nuts but an article had some
trigger words for them in the initial fixes to the much publicised
problems with Intel/AMD/ARM etc :
"After these changes, the time stamp returned by |performance.now| will
be less precise due to lower resolution. Some
to experimenting
with it.
The only down side was that the Mail made me collect it from my local
office, charged me an additional $50 at today's conversion rate to import
the board.
Regards
David GM8XBZ
-Original Message-
From: time-nuts [mailto:time-nuts-boun...@febo.com] On Behalf Of S. Jackson
via
. Disabling the low power CPU state
fixed it until a BIOS update was released.
It has been a while but as I recall, the NTP client kept the OS from
drifting further behind but the time was still noticeably off.
On Fri, 5 Oct 2012 00:42:42 -0400, Bob Bownes bow...@gmail.com
wrote:
David
What aspects of USB would HP have used? Just the complexity of a USB
OHCI/UHCI would have been economically prohibitive compared to an
asynchronous serial UART. An OHCI/UHCI is more like an ethernet
controller and those took up the space of entire expansion boards
initially.
What they did
Ah well, I missed it but only because I have seen other people make
the same suggestion seriously in the recent past.
Where is my box of 2102 DRAMs? I left it around here somewhere.
On Wed, 10 Oct 2012 11:15:32 -0400, paul swed paulsw...@gmail.com
wrote:
David it was humor
Regards
On Wed, Oct
finishes a build). It's supported on just about
every chip set in the universe. I suspect it will outlive the cockroaches.
Bob
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of David
Sent: Wednesday, October 10, 2012 10:54 AM
On Fri, 26 Oct 2012 12:53:02 -0500, Dennis Ferguson
dennis.c.fergu...@gmail.com wrote:
Also, some antennas are better at rejecting low angle signals than others.
While the software can reject some undesired signals, it can only do so if
the software can identify them as separate. If the
I have used NiMH D cells as directly replacements for NiCd D cells in
devices that have slow, 0.1C rate or 14 hour, chargers without
problems. It takes longer to fully charge since the NiMH cells have
about twice the capacity but then they last about twice as long.
The price for the MiMH cells
On Tue, 06 Nov 2012 02:14:04 +0100, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
Hi Bob,
On 11/05/2012 01:30 PM, Bob Camp wrote:
Hi
As a practical example - a SR620 will look much better reading it's own
reference than it will looking at almost anything else. That said, it's
still a
is specified to be within 1uS
and has a pulse to pulse jitter in the 10s of nanoseconds.
On Wed, 7 Nov 2012 21:41:36 +, David Kirkby
david.kir...@onetel.net wrote:
Someone at my radio club uses some mode of operation where accurate
time is required. He said the standard Windoze clock does
.
At least modern PC clocks do not drift that badly in a few minutes. So it
is pretty odd.
Without further detail I am at a loss for why you need to do that.
Maybe he is tinkering with spreadspectrum?
Regards
Paul
On Wed, Nov 7, 2012 at 5:04 PM, David davidwh...@gmail.com wrote:
Some Windows NTP
understand why mS timing would be necessary?
I must be missing something.
Didier KO4BB
Didier
Sent from my Droid Razr 4G LTE wireless tracker.
-Original Message-
From: David Kirkby david.kir...@onetel.net
To: Discussion of precise time and frequency measurement time-nuts@febo.com
Sent: Wed
On Thu, 15 Nov 2012 05:02:54 -0800, Jim Lux jim...@earthlink.net
wrote:
On 11/15/12 4:30 AM, David J Taylor wrote:
i just used this to with a raspberry pi with good success.
https://www.adafruit.com/products/746
james
===
It looks idea, James
On Thu, 15 Nov 2012 06:07:28 -0800, Jim Lux jim...@earthlink.net
wrote:
On 11/15/12 5:33 AM, David wrote:
On Thu, 15 Nov 2012 05:02:54 -0800, Jim Lux jim...@earthlink.net
wrote:
On 11/15/12 4:30 AM, David J Taylor wrote:
i just used this to with a raspberry pi with good success.
https
On Thu, 15 Nov 2012 15:06:10 -, David J Taylor
david-tay...@blueyonder.co.uk wrote:
-Original Message-
From: David
[]
So the 16x manual says. As far as I know, all of the Garmin LVC, HVC,
and 5Hz versions of their receivers have a timing pulse output.
The GPS18 series that I have
TTL transition times are not all that fast, about 6ns for LS TTL, and
with a 26uS pulse width, you would only need a fast oscilloscope to
characterize the pulse edges. Delay, phase, and pulse height
measurements in this case could be made even with a 20 MHz,
0.35/20Mhz=17.5ns rise and fall time,
I can think of some possibilities with the caveat that I am not
familiar with the Z3805A units:
1. The PPS output could be damaged.
2. The PPS output could be an open collector/drain output which
requires a pull-up resistor since it can only sink current.
3. The PPS output might have trouble
Something else occurred to me after I posted.
A 0.15 volt glitch could come from capacitive coupling if there was an
open in the PPS output of if it was an adjacent pin.
On Sat, 24 Nov 2012 16:52:50 -0800 (PST), Mark Spencer
mspencer12...@yahoo.ca wrote:
Thanks all for the responses.
I am
I do not know about the Thunderbolt in particular but some GPS
receivers are more sensitive than others and will work acceptably like
you describe. My house has similar construction and all of my GPS
receivers except maybe for my GPS18-5Hz hockey puck will operate in
the attic under the asphalt
You can measure the cycle to cycle jitter of the GPS PPS output using
the Racal Dana 1992 down to the nanosecond pretty easily with the
caveat that it will only measure alternate cycles.
Period mode or Time Interval A to B mode will work for this
measurement of a 1 Hz source. If you have a
I am pretty sure you are right on the mark there.
I made a habit of listening to the tone modulated seismic transmitters
in southern California and with experience, they definitely sounded
like you would expect if a source was reflecting off of various
impedance discontinuities in the crust which
Originally the IBM PC design used an 8253 or 8254 PIT, programmable
interval timer, located at ports 40h to 43h with Timer 0 clocked at
1.193182 MHz (1/3rd of 3.579545 MHz or 1/12th of 14.318 MHz) and set
to divide by 65536 which generated about an 18.2 Hz interrupt rate on
IRQ 0. Timer 1
On Sun, 02 Dec 2012 01:53:07 +0100, Magnus Danielson
mag...@rubidium.dyndns.org wrote:
On 12/02/2012 01:29 AM, David wrote:
Originally the IBM PC design used an 8253 or 8254 PIT, programmable
interval timer, located at ports 40h to 43h with Timer 0 clocked at
1.193182 MHz (1/3rd of 3.579545
On Sat, 01 Dec 2012 19:10:54 -0800, Hal Murray
hmur...@megapathdsl.net wrote:
davidwh...@gmail.com said:
One of my favorite tricks back when the ISA bus was still available was to
use a custom expansion board I built and an oscilloscope to measure the
interrupt latency.
You can do the same
On Sun, 2 Dec 2012 08:43:39 -0500, Bob Camp li...@rtty.us wrote:
Hi
Maybe I'm just shopping in the right places. I have yet to build up a desktop
machine that does *not* have at least one COM port on the motherboard. That's
been true all the way from simple little Atom based ITX boards right
In past designs I just included an EEPROM so in the event of a cold
start, the last settings would be known.
On Thu, 6 Dec 2012 10:45:48 -0800 (PST), M. Simon
msimon6...@yahoo.com wrote:
I would use a digital pot for coarse setting. Or a manual trimpot. That way
your control signal holds even
You can use the ATmega328 16 bit timer/counter in input capture mode
to count the number of 10 MHz OCXO cycles per pulse per second period
to a resolution of 100ns but there are some problems:
The ATmega328 16 bit timer/counter external clock is limited to 1/4 of
the CPU frequency with an
/4 clock is not going to get you very near a
Shera. It's even further from the more modern enhanced Shera designs.
Bob
On Dec 6, 2012, at 6:59 PM, David davidwh...@gmail.com wrote:
You can use the ATmega328 16 bit timer/counter in input capture mode
to count the number of 10 MHz OCXO cycles
There are lots of sampling ADCs which will support that type of
operation directly or you can easily design and build a sampling phase
detector but that all involves significant extra circuitry outside of
the microcontroller.
Take a look at the Racal Dana 1992 reference frequency multiplier
weirdos who likes ECL whether integrated or
discrete.
On Thu, 6 Dec 2012 20:22:58 -0500 (EST), saidj...@aol.com wrote:
David,
The NXP LPC932 processor series are very cheap and small, and we got very
excited to see timers running at up to 32MHz internally if I remember
correctly
Sorry. The Shera counter is 16 bits and not 12 bits but that does not
change what I posted.
On Thu, 06 Dec 2012 19:17:48 -0600, David davidwh...@gmail.com
wrote:
It is not a 16 bit capture and it does not run at 1/4 the clock rate.
The Shera uses a 12 bit counter to capture the phase
The other timer on the ATmega328 lacks an input capture pin and
register. I did not check all of the different AVR microcontrollers
used in Arduinos.
On Fri, 7 Dec 2012 02:03:39 +, Mark Sims hol...@hotmail.com
wrote:
I think only TIMER2 on the AVR has the clk/4 limitation. The other
On Fri, 07 Dec 2012 17:50:55 -0500, Charles P. Steinmetz
charles_steinm...@lavabit.com wrote:
John wrote:
What's *really* interesting, though, is the idea that collectively
we might develop some standard measurement protocols that would be
reproducible in a number of (amateur) labs.
I agree,
On Sun, 09 Dec 2012 15:49:04 -0800, Hal Murray
hmur...@megapathdsl.net wrote:
li...@rtty.us said:
1) Convert them both to logic levels and use a gate.
2) Use a relay.
Both would need some sort of timer to drive them. Both would disrupt the
instrument when the switch took place. I know of no
Integrating converters including delta-sigma converters can be no
missing codes by design without being able to take advantage of the
full resolution that implies. Integral nonlinearity, drift, and noise
will limit the usable resolution.
On Mon, 10 Dec 2012 15:08:38 -0600, Didier Juges
The gain drift is specified at 2ppm per degree C. There are
provisions for a calibration cycle but that requires external
multiplexing.
On Mon, 10 Dec 2012 07:26:55 -0800 (PST), Robert LaJeunesse
rlajeune...@sbcglobal.net wrote:
. . .
typical for better monolithic sigma-delta converters.
On Mon, 10 Dec 2012 23:01:49 +, Poul-Henning Kamp
p...@phk.freebsd.dk wrote:
In message tilcc892a6ntfk64t2nljm92idr92df...@4ax.com, David writes:
The gain drift is specified at 2ppm per degree C. There are
provisions for a calibration cycle but that requires external
multiplexing.
That's
between resolution and effective bits
makes me wonder what's the point of advertising the former other than
bragging rights?
On Mon, Dec 10, 2012 at 3:38 PM, David davidwh...@gmail.com wrote:
Integrating converters including delta-sigma converters can be no
missing codes by design without being
If the trailing edge of one of the pulses is reliable, you could
measure from the starting edge of one pulse to the trailing edge of
the other pulse.
It is not impossible to make an adjustable but accurate pulse delay
using a comparator or maybe a gate. How accurate does your
measurement need to
On Fri, 14 Dec 2012 00:06:15 +0100, timen...@triplespark.net wrote:
On Dec 13, 2012, at 4:57 AM, Hal Murray hmur...@megapathdsl.net wrote:
Suppose I want to compare the PPS outputs of 2 GPS units. The problem is
that I don't know which one will happen first.
If I feed them into the
I thought the networks did that deliberately to frustrate automated
time shifting.
On Sat, 15 Dec 2012 19:04:05 -0500, Joe Leikhim jleik...@leikhim.com
wrote:
I have to wonder how seriously these network designers are with respect
to timing.
For example we have Brighthouse cable. The time on
On Mon, 17 Dec 2012 10:19:43 -0800, Hal Murray
hmur...@megapathdsl.net wrote:
A fifth solution is to use a pulse delay generator like a DG535. I use this
to create high-resolution early/late 1PPS sync pulses. They show up on eBay,
but aren't cheap. For bargains, watch for older model
a lot .
Bob
On Dec 17, 2012, at 1:56 PM, David davidwh...@gmail.com wrote:
On Mon, 17 Dec 2012 10:19:43 -0800, Hal Murray
hmur...@megapathdsl.net wrote:
A fifth solution is to use a pulse delay generator like a DG535. I use this
to create high-resolution early/late 1PPS sync pulses
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.
Essentially it was transmission line with a ridiculously low velocity
factor. It is great
-for-475-Oscilloscope-New-/290824098279?pt=LH_DefaultDomain_0hash=item43b67791e7
Em 17/12/2012 23:39, David escreveu:
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
/ get it off the board thing
becomes the main issue. Then it's easier to just make the delay line part of
the PC layout.
Bob
On Dec 17, 2012, at 8:39 PM, David davidwh...@gmail.com wrote:
I wish there was an source for helically wound shielded differential
transmission line like the type
On Tue, 18 Dec 2012 16:51:02 -0500, paul swed paulsw...@gmail.com
wrote:
John 2 with the same type of issue that is bad luck or simply age. Oh my do
I for see this in my future?
I would be willing to bet it exactly looks like your description. I like
the fact that for $1.23 you can get something
On Sat, 29 Dec 2012 12:18:56 -0800, Said Jackson saidj...@aol.com
wrote:
Fabio,
Happens in all the GPS receivers we have tested here. The difference between
receivers is how fast they can recognize this error and how fast they can
re-aquire once they shut off the 1PPS output due to tcxo
They do not exist as I found out (again) not long ago. The last 7490
made was LS (low power schottky) and I use quite a few of them.
Actually, I have seen a datasheet for a 74HC90 and 74HCT90 but they
apparently either never went into production or very few were
produced.
The closest non-TTL
2013 21:02:32 -0500, Tom Miller
tmil...@skylinenet.net wrote:
Isn't there a fast divide by N counter that you could set to 10? Maybe even
in ECL?
- Original Message -
From: David davidwh...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent
Electronic Design recently ran an article discussing the various free
SPICE and other circuit simulators available for download. LTspice
which I have seen several list members use is prominently mentioned.
For those who missed it, here is a link to the online article:
My solution was similar. I have a few old systems that work fine and
have serial and parallel ports. For my more recent workstations, I
add a PCI or PCIe serial/parallel port adapter if needed.
On Fri, 11 Jan 2013 12:03:48 -0500 (EST), gandal...@aol.com wrote:
Hi Joe
As per other replies I
On Sun, 13 Jan 2013 19:00:46 -0500, Charles P. Steinmetz
charles_steinm...@lavabit.com wrote:
Ed wrote:
On opening it up I found that the circuitry includes a 74LS73 dual
JK FF, and a 74LS140 - very obscure - apparently a dual 4-input gate
of some sort.
AFAIK, the '140 was only supplied in
The Racal Dana 1991/1992 OCXO has a big pair of pan head screws
exposed on the back. One is coarse adjust and one is fine adjust. I
have the TCXO version which also exposes the adjustment on the back so
you do not have to open anything to get to it.
You can see them here:
On Mon, 14 Jan 2013 21:14:23 +0100, Fabio Eboli fabi...@quipo.it
wrote:
Hello,
recently I tried to trim the Racal Dana
1992 04E internal reference, using the
GPS pps as a reference. I'd like to ask
a pair of questions...
- First is about the method.
I'm using the counter TI to measure it's
own
I know they were discussed here in the past but I do not remember any
performance reports. I may buy a couple myself but I do not have the
equipment yet to evaluate one.
On Tue, 15 Jan 2013 21:10:03 -0700, Joseph Gray jg...@zianet.com
wrote:
I just ordered a few of these. They looked like a
If the GPS receiver hardware itself is integrated then it would
require a separate firmware update which may not be possible. I know
one of my more recent Garmin receivers has separate firmware for the
integrated GPS receiver and the unit as a whole.
On Thu, 17 Jan 2013 09:22:55 -0500, Bob Camp
On Thu, 17 Jan 2013 07:08:20 -0800, Jim Lux jim...@earthlink.net
wrote:
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
I have seen it used in a couple of Tektronix TM500 instruments but the
purpose may have been to generate a lower voltage power supply rail
instead of noise reduction. Tektronix often added LC sections on
their switching power supply outputs and distributed smaller LC
sections to prevent coupling
The poster is asking about ethernet over power line and not power over
ethernet. As you point out, the later should have zero effect on
ethernet latency.
There are several ethernet over power standards. Latency will include
a bridge in each adapter, the effects of a noisy uncontrolled AC power
On Sun, 10 Feb 2013 12:44:57 -0600, Bill Hawkins b...@iaxs.net
wrote:
Rob,
One of the common characteristics of power lines is noise.
Seems to me that bursts of noise could interrupt the Ethernet signal,
causing retries of the transmission.
Now, I'm only familiar with SNTP, which uses UDP
The most straightforward method these days would be a small
microcontroller implementing a pulse width modulation digital to
analog converter.
The analog route is pretty easy though. A traditional charge or
current pump can operate down to 30 Hz but will have an output ripple
versus settling
On Fri, 22 Feb 2013 15:16:37 -0800, Tom Van Baak
t...@leapsecond.com wrote:
There is a lot of noise on the line. I'm not sure if frequency makes sense
on a cycle to cycle basis.
Hal, it might make sense since the OP is designing a PLL and wants to get a
feel for (short-term) frequency
That was on my mind when I suggested a sampling phase comparator with
the sampling time adjusted for noise rejection. Of course since I
have been doing a lot of research recently on sampler design, every
problem looks like a nail. :)
Thyristor commutation into a reactive load can be nasty but I
As far as I can tell by looking at the release notes and the settings
in Timelab itself, none of the Racal-Dana counters are directly
supported which is unfortunate because my best counter is a 1992 that
I rebuilt.
Timelab and the Racal-Dana 1991/1992 both support talk only mode
though so maybe
After a couple of bad experiences with foamed polyethylene that got
contaminated and solid polyethylene where heat had allowed the center
conductor to shift, I have stuck with RG-142 and RG-400 style coax for
short patch cables.
For little stuff that gets soldered into place, I use add RG-316 and
On Wed, 13 Mar 2013 10:17:30 -0700, Chris Albertson
albertson.ch...@gmail.com wrote:
On Wed, Mar 13, 2013 at 6:03 AM, hutt...@seznam.cz wrote:
I have GPS without position hold, I wonder how precise 1PPS, which I want
to use for disciplined OCXO.
THere is more difference between brands and
On Wed, 13 Mar 2013 23:07:01 -0400, Michael Tharp
g...@partiallystapled.com wrote:
On 03/13/2013 09:05 PM, David wrote:
This brings up something that I have wondered about for a while.
The Garmin GPS18x (and many other receivers) specify the PPS output as
within 1uS but does that mean
On Mon, 25 Mar 2013 14:56:25 -0700, Hal Murray
hmur...@megapathdsl.net wrote:
n1...@alum.dartmouth.org said:
S/LS logic was introduced in the mid 70's, F/AS/ALS around 1980, HC was
early 80's. By the third 7400 generation (F/AS/ALS) the problem was well
known with parameters available and
On Tue, 26 Mar 2013 05:05:26 +0100, Anthony G. Atkielski
anth...@atkielski.com wrote:
Dan (I think) writes:
Because, up until today, windows time did what I needed it to do. It may
still, if the fault turns out to be network related.
In reality, it's more software to learn to administer, and
If I did not go the microcontroller PWM route I would use a Johnson
counter (twisted ring counter) to directly generate three 120 degree
phases. There is a good example here:
http://www.allaboutcircuits.com/vol_4/chpt_12/6.html
On Wed, 27 Mar 2013 21:55:32 -0400, Bob Camp li...@rtty.us wrote:
On Sat, 13 Apr 2013 14:07:05 -0700, Hal Murray
hmur...@megapathdsl.net wrote:
Can someone in the know clarify this?
I'm not in the know.
Several years ago, I found a short chunk of coax that the cable TV guys had
left on the ground. It included a piece of heavy wall shrink tubing. There
On Wed, 17 Apr 2013 07:26:46 -0400, Bob Camp li...@rtty.us wrote:
On Apr 16, 2013, at 9:51 PM, Richard (Rick) Karlquist rich...@karlquist.com
wrote:
On 4/14/2013 7:48 AM, Brian Davis wrote:
Not sure if it's already been mentioned, but Linear has introduced a new
part that looks interesting :
On Wed, 17 Apr 2013 17:40:29 +0200, Volker Esper ail...@t-online.de
wrote:
Am 17.04.2013 15:23, schrieb David:
...
I have been looking into low jitter triggers for sampling systems
recently and will probably end up using a discrete differential
amplifier driving ECL logic.
Why discrete
On Sat, 20 Apr 2013 20:14:06 +, Poul-Henning Kamp
p...@phk.freebsd.dk wrote:
I looked at the DAC1220 first, but in an EFC application it worries
me to no end that it is a Sigma-Delta DAC.
Even if I feed it a clock divided down from the OCXO you're EFC'ing,
to avoid beatfrequency effects, I
On Sun, 21 Apr 2013 06:41:06 +, Poul-Henning Kamp
p...@phk.freebsd.dk wrote:
In message f356n894epicao60crhh56g7itkofer...@4ax.com, David writes:
The DAC1220 span and offset drift versus temperature on the other hand
are 20 to 50 times worse than that of the AD5791 unless you want to
spend
On Sun, 21 Apr 2013 09:20:28 +, Poul-Henning Kamp
p...@phk.freebsd.dk wrote:
In message lf47n81l7t8su75pimf6it1pfm74n3p...@4ax.com, David writes:
On Sun, 21 Apr 2013 06:41:06 +, Poul-Henning Kamp
Uhm, you lost me there, autocalibration feature ?
Sorry, I meant the DAC1220 manual self
On Mon, 22 Apr 2013 16:13:17 +, Poul-Henning Kamp
p...@phk.freebsd.dk wrote:
In message trinity-7a7ee757-89f7-4b92-8884-9435668fef15-1366646349138@3capp-gm
x-bs21, Jochen Frieling writes:
your finding is quite interesting. I would like to replicate your
measurements on some other voltage
On Tue, 23 Apr 2013 19:05:53 +0200, Attila Kinali att...@kinali.ch
wrote:
On Tue, 23 Apr 2013 09:49:19 +0400
Daniel Ginsburg dginsb...@gmail.com wrote:
Not perfect, but should be reasonably good. It's an external magnetic
antenna on my windowsill.
Anyway, +-400ns I'm seeing translates to
to
your GPS / Rubidium / Caesium / Maser standards and calibrate the watch
drift (including temp effects) etc. It might be a bit of a trick to get Lady
Heather to run on it.
Links:
www.ti.com/ez430
www.ti.com/chronoswiki
David
___
time-nuts mailing
Might be worth a glance:
http://www.eevblog.com/2010/07/25/eevblog-101-hacking-your-own-peltier-lab-thermal-chamber/
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and
.
Using standard E12 values:
220R in parallel with 2k2 is exactly 200R.
330R in parallel with 3k3 is exactly 300R.
Just stack the two parts on the single footprint, sadly I knew the answers
without calculating, need to get out more
David
___
time
the reference clock rather than a
large and expensive OCXO.
Starting afresh I may have gone for the CW25 but I've got the CW12 so not
thought much more about it.
Regards
David Mackenzie (GM4HJQ)
___
time-nuts mailing list -- time-nuts@febo.com
.
At the moment the OCXO is happily locking down and vastly cleaner than the
CW25 output, given time I want to modify my 60kHz (MSF) time signal receiver
before I review the PLL in the GPS.
Regards
David
___
time-nuts mailing list -- time-nuts@febo.com
with care alongside some other histories to maintain
balance.
Regards
David
-Original Message-
Hej Magnus
A capacitive sensing AC bridge can be very sensitive, one only has to
look at the work of RV Jones at the university of Glasgow in
the 50's,
60's and 70's. He and his
not see any symptoms
other than the self test error message. A nice counter but I'm getting ever
more nervous about the ability of current test equipment to survive 5 to 10
years.
David
___
time-nuts mailing list -- time-nuts@febo.com
To unsubscribe, go
101 - 200 of 2843 matches
Mail list logo
