Many thanks to all the respondents to my question.
Nice to know I can still think some things through in a good way! ;-)
Re the below..
Yes, I should have said "dual trace" not "dual beam". "My bad" as some say.
I should know better, having spent some 3 1/2 years of my life as
in-house servic
> Dave B. (G0WBX)
>
> PS: I do like the idea of setting up a camera to take a photo of the
> 'scope every hour or so! Not practical for many I guess, but it
> illustrates the point well. But the aliasing opportunity I think would
> be perhaps too great, in essence being a sampled data system by th
Tom - I love the idea of taking (a series of) accurately timed
photograph(s), but have no idea how to go about it - can you please explain
how you did it for your mains-driven clock?
Peter (London)
On Mon, 1 Oct 2018 at 09:39, Tom Van Baak wrote:
...
> For hourly photos consider using a webc
> Tom - I love the idea of taking (a series of) accurately timed photograph(s),
> but have no idea
> how to go about it - can you please explain how you did it for your
> mains-driven clock?
Hi Peter,
During that year I collected lots of mains timing data. There are many ways to
do that; in my
Hi, does anyone have any idea why a "Black Star" 2.4GHz counter would stop
working on all ranges?
Display updating fine and buttons work but signal has no effect on any of the 3
input BNCs.
The oscillator looks OK but to be honest this was calibrated sometime in 1997
so it may just be too old :
I cheered when I saw Dave B's "silly question", for
then I realized that I'm not the only one who likes
to measure things with an o'scope.
I had purchased a GPSDO a few weeks before and
had been observing its behavior relative to a free-
running Rb by watching 10 MHz sinewaves drift with
respect
Moot point with free running clock oscillators in the digitising sound
cards often used. Some of the all in one cards with fast A/D's and
FPGA's etc can take an external frequency reference.
Some "adjustment" of the data can be done in software, to calibrate the
frequency domain. Smoke and mirro
I made a mistake in the previous post we use the ICS 570 with very good results
in many applications. So it was easy to test. This has to be the easiest and
lowest cost circuit. Start with an AC14 ST, followed by a divide by 5. I used
part of a HC390 but a LS 90 will do. Take the 2 MHz output fe
The CY2077FZXI might work, if you have a programmer for it...
Dan
Digikey:
https://www.digikey.com/product-detail/en/cypress-semiconductor-corp/CY2077FZXI/CY2077FZXI-ND/2116380
On 10/1/2018 12:00 PM, time-nuts-requ...@lists.febo.com wrote:
That should work, also for the 12 MHz case with 6
Hi All. Over the years, I have experimented with WWVB and GPS and Rubidium
timing to establish a 10MHz Standard for LO sync in communications receivers.
My career has kept me away from the hobby for some time and, frankly, I am not
very well versed in some of the timing techniques that I read he
On 10/1/18 9:43 AM, Bob Betts wrote:
Hi All. Over the years, I have experimented with WWVB and GPS and Rubidium timing to
establish a 10MHz Standard for LO sync in communications receivers. My career has kept me
away from the hobby for some time and, frankly, I am not very well versed in some o
Isn't it the case that computer clocks these days are subject to two
influences that make them worthless for timing?
1. Deliberate random FM to spectrally spread RFI leakage.
and
2, Wild variations of clock speed according to usage needs of the moment,
in order to reduce average power consum
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This sounds interesting enough and I would appreciate any notes or insight on
doing this. I have a PRS10 and several GPSDOs that I would like to evaluate for
performance on my scope.
Many thanks.
Dana Whitlow wrote:
> I cheered when I saw Dave B's "silly question", for
> then I realized
On 10/1/2018 9:01 AM, ew via time-nuts wrote:
I made a mistake in the previous post we use the ICS 570 with very good results
in many applications. So it was easy to test. This has to be the easiest and
lowest cost circuit. Start with an AC14 ST, followed by a divide by 5. I used
part of a
Interested as well
-=Bryan=-
From: time-nuts on behalf of Chris Burford
Sent: October 1, 2018 6:20 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Oscilloscope-based measurements of frequency stability
This sounds interesti
Peter Vince writes:
> Tom - I love the idea of taking (a series of) accurately timed
> photograph(s), but have no idea how to go about it - can you please explain
> how you did it for your mains-driven clock?
For video you'd need to start with a camera that has a genlock interface
and then frame-s
Hi
If the device is attaching to a micro controller (as in the original request),
feeding it a few
bits to get it set up may not add any parts at all. No, that’s not a certainty,
but it usually
is a pretty good guess. Most micro’s these days will start up on an internal
clock source so
even t
On 10/1/18 10:44 AM, Dana Whitlow wrote:
Isn't it the case that computer clocks these days are subject to two
influences that make them worthless for timing?
1. Deliberate random FM to spectrally spread RFI leakage.
and
2, Wild variations of clock speed according to usage needs of the moment,
No one mentioned using Lissajous patterns for comparing
frequencies if the scope has an XY mode. Google Lissajous
if interested.
Rick N6RK
On 10/1/2018 11:40 AM, Bryan _ wrote:
Interested as well
-=Bryan=-
From: time-nuts on behalf of Chris Burford
Sent: O
Hi
At least on the parts I’ve used, spread spectrum is a software controlled
feature.
You use it or not depending on what you are trying to do. There are a lot of
systems
out there that have fairly tight timing needs (though not time nut level
stuff).
Yes, this all *assumes* you are writing c
This is just what I was trying to do with my paper on "sine-wave
fitting", which can be found at arXiv:1711.07911 . Look at the relative
phase of two frequency sources using a scope and then plot it versus time.
With a digital scope (Digilent Analog Discovery) , there's no reason to
take a s
I've done the Lissajous thing, but it takes an extra bit of effort to
work out the phase angle. I've always gone back to the sliding
waveforms display for simplicity.
But I'll admit the Lissajous pattern is a lot prettier, and looks great
in Sci Fi movies.
Dana
On Mon, Oct 1, 2018 at 4:06 PM
The correct cite is arXiv:1711.07917.
On 10/1/2018 4:05 PM, Ralph Devoe wrote:
This is just what I was trying to do with my paper on "sine-wave
fitting", which can be found at arXiv:1711.07911 . Look at the relative
phase of two frequency sources using a scope and then plot it versus tim
I like the sliding waveforms and a variation used by General Radio with their
circular sweep 1109A comparison oscilloscope. I built a slightly different
model:
Franke, John M.: “A Circular Sweep Frequency Calibrator,” The AMSAT Journal,
Volume 31, No. 4, July/August 2008, pp. 4-7.
Reprinted
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