Fellow Time-Nuts,
When I first uploaded the Simple PICTIC interpolating time interval
counter to the K04BB site in 12/08 and presented it to the group as
a Christmas present my goal was to get amateurs building their own
interpolating time interval counters for GPS monitoring and making
Ah! Sounds like you were subjected to the Bruce factor. It's a case
of publish a design and then expect to be insulted about it. I'm glad
you weathered the storm and wish to thank you for your present.
Steve
On 26 June 2010 19:11, Richard H McCorkle mccor...@ptialaska.net wrote:
Fellow
I would like to track the EFC voltage in hardware using something
cheap and ready to hand. I was thinking of using a sound card as it
has good resolution but it's obviously only AC coupled so it would not
measure the DC of the EFC. I thought about modifying a sound card to
make it DC coupled but
Warren, advice from a friend, stop doing this please.
Everyone else, please stop feeding the troll.
Steve
On 26 June 2010 08:32, WarrenS warrensjmail-...@yahoo.com wrote:
Charles Posted a bunch of stuff (below),
Most think I should just ignore him, but I can not help myself,
he has after
On 6/26/2010 7:12 AM, Steve Rooke wrote:
Deletia
I next thought about turning the DC into AC by chopping it, IE.
inverting 50% of the voltage via an oscillator. This way I could pass
the square wave directly into an unmodified sound card, take
measurements and then do an RMS calculation on
I wonder if anyone has done something like this before and could share
their experiences.
The general principle should work. However, as you're interested in
slow changes, there are some error sources that might be
unacceptable, including the drift of (differential) channel
resistances for
Gerard,
On 26 June 2010 09:46, Gerard PG5G p...@b737.co.uk wrote:
Warren,
I couldn't care less whether your or any method works or not. I have no
vested interest or opinion whatsoever.
Well, if your not interested in this, why are you bothering us by your
opinions. Perhaps *you* should leave
Steve,
I think using a voltage-to-frequency converter would solve that problem. They
are not too expensive and there are several flavors from Amalog devices and some
others.
Just set it for a 1KHz start point or maybe 10KHz.
BillWB6BNQ
Steve Rooke wrote:
I would like to track the EFC
I imagine that there are people on this list like myself with limited
engineering experience
but a healthy appetite for knowledge and an interest in time/frequency
measurement.
I have little interest in complex math - an inherent brain block methinks, but
enjoy
building hardware and
Hi
Now, that's one I can heartily agree with.
Bob
On Jun 26, 2010, at 9:08 AM, Steve Rooke wrote:
Warren, advice from a friend, stop doing this please.
Everyone else, please stop feeding the troll.
Steve
On 26 June 2010 08:32, WarrenS warrensjmail-...@yahoo.com wrote:
Charles
Oz,
On 27 June 2010 01:09, Oz-in-DFW li...@ozindfw.net wrote:
On 6/26/2010 7:12 AM, Steve Rooke wrote:
Deletia
I next thought about turning the DC into AC by chopping it, IE.
inverting 50% of the voltage via an oscillator. This way I could pass
the square wave directly into an unmodified
J.D. Bakker wrote:
I wonder if anyone has done something like this before and could share
their experiences.
The general principle should work. However, as you're interested in slow
changes, there are some error sources that might be unacceptable,
including the drift of (differential)
JDB,
On 27 June 2010 01:19, J.D. Bakker j...@lartmaker.nl wrote:
I wonder if anyone has done something like this before and could share
their experiences.
The general principle should work. However, as you're interested in slow
changes, there are some error sources that might be
Bill,
On 27 June 2010 01:21, WB6BNQ wb6...@cox.net wrote:
Steve,
I think using a voltage-to-frequency converter would solve that problem. They
are not too expensive and there are several flavors from Amalog devices and
some
others.
I just had one of those duh! moments :) It does make the
On 6/26/2010 8:36 AM, Steve Rooke wrote:
Oz,
On 27 June 2010 01:09, Oz-in-DFW li...@ozindfw.net wrote:
On 6/26/2010 7:12 AM, Steve Rooke wrote:
Deletia
I've done similar stuff in work projects, but never written code. I've
thought about this some as well. I'd consider a
On 27 June 2010 01:40, jimlux jim...@earthlink.net wrote:
J.D. Bakker wrote:
I wonder if anyone has done something like this before and could share
their experiences.
The general principle should work. However, as you're interested in slow
changes, there are some error sources that might be
Oz,
On 27 June 2010 01:49, Oz-in-DFW li...@ozindfw.net wrote:
Soundcards have inputs and outputs. You can feed the output with a
series of samples that represent your control waveform. The PC becomes
the oscillator and you know it's frequency and relative phase track.
Brilliant!
Chopping
Steve,
It's for people like you that makes this whole thing worthwhile. Keep
hanging on the line and I'm certain something will transpire.
Best regards,
Steve
On 27 June 2010 01:24, Steve Roberts st...@borisone.demon.co.uk wrote:
I imagine that there are people on this list like myself with
Oz-in-DFW wrote:
Chopping is used to cancel DC offsets in imperfect amplifiers, it adds
no gain. If there is a DC component and you filter with a cutoff
frequency below the chop rate, the offsets of the amplifier can be
effectively canceled.
Chopping isn't quite that magical. You chop the
Steve Rooke wrote:
The eval board for the part may have a computer interface built into it.
So I need to locate this if possible, any pointer please?
Go to Analog Devices website (http://www.analog.com/) and find your
ADC.. typically there's an eval board with a USB interface available.
Steve,
Large amplitude signals on the input ports tend to leak into the inputs on
sound cards. Isolation testing required!
Soundcards have inputs and outputs. You can feed the output with a
series of samples that represent your control waveform. The PC becomes
the oscillator and you know
Steve,
Do a simulation and see how your card behaves. I've had some unexpected
results in similar attempts years ago.
Nothing like an add on card suitable for the job. These cards are not cheap.
I would like to track the EFC voltage in hardware using something
cheap and ready to hand. I was
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
I am commenting on my own comment :)
I have been using a similar kit from TI for the MSC1210Y5 processor (originally
Burr-Brown, acquired by TI since). It was $50 and worked great. I have since
made several projects at work using the chip.
Unfortunately, the MSC1210 kit is no longer available,
[voltage-to-frequency converter]
I just had one of those duh! moments :) It does make the sampling a little
more complicated as I'd have to take a number of samples and do something
like a FFT to get the frequency, I think. My idea seemed just a simple way
to just make a single, or limited
At 06:40 -0700 26-06-2010, jimlux wrote:
J.D. Bakker wrote:
Charge injection is a bit on the high side on a
4066; a more expensive (A)DG4xx-series chip may improve on that.
Or the traditional chopper approach of a mercury wetted reed relay?
Good luck with that in this day
Moin Richard,
On Fri, 25 Jun 2010 23:11:39 -0800 (AKDT)
Richard H McCorkle mccor...@ptialaska.net wrote:
Over the last 18 months I have developed a new diode switched
interpolator based on the comments made on line and have thoroughly
tested it. Some suggestions made improvements in the
Moin,
I recently had a look at the data sheet of the LEA6-T GPS module
from ublox, which now features a second time pulse output that
is capable of delivering a 10MHz signal, synchronized to GPS.
After thinking quite some time quite some time about building
my own GPSDO and struggling with the
At 01:43 +1200 27-06-2010, Steve Rooke wrote:
I don't know if it qualifies as simple/cheap, but Analog Devices and others
have single chip low-rate sigma/delta converters with good to excellent
properties; these were meant for strain gauges but should be able to track
slow-moving
Hello Attila,
Another GPS board with a 10 MHz output is the Navsync CW-12 module
(price ~US$85-90). I measured the 1 PPS output and found a Standard
Deviation of 5 ns with a range of 30 ns. The 10 MHz output is kept
on frequency by occasionally adjusting the period of the 10 MHz output
Moin,
On Sat, 26 Jun 2010 12:38:29 -0600
Ed Palmer ed_pal...@sasktel.net wrote:
Another GPS board with a 10 MHz output is the Navsync CW-12 module
(price ~US$85-90).
Hmm.. i didn't know about this one. Both seem to be comparable
from the specs, the LEA6-T being slightly better (well, the
Didier Juges wrote:
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
In message 4c265bb1.8090...@earthlink.net, jimlux writes:
sound card ADCs, the high end 24 bit ones, are pretty darn linear [...]
That is actually a very debatable proposition, a lot of them are
tracking types that conveniently cover up any lack of linearity
on the analog side of the fence.
The
Here we go again
C
-Original Message-
From: time-nuts-boun...@febo.com [mailto:time-nuts-boun...@febo.com] On
Behalf Of Poul-Henning Kamp
Sent: 26 June 2010 21:06
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] EFC tracking
In message
I can only guess at what a sound card with linearity specs approaching those of
the AD kit would cost, and it's still AC coupled, and as Poul pointed out, has
no long term stability spec.
To me, it sounds like a no brainer, pun intended :)
Alternately, my last HP3456A cost me about $50, and
sound card ADCs, the high end 24 bit ones, are pretty darn linear [...]
That is actually a very debatable proposition, a lot of them are
tracking types that conveniently cover up any lack of linearity
on the analog side of the fence.
Can you elaborate on that? Linearity is linearity -
I have a FEI Communications FE-405B DOCXO looking for info.
Sales flyer and pictures of the unit here: www.n4iqt.com/fei-fe405b
The Sales flyer listed the 405A and I have the 405B don't know the difference.
A manual that shows the digital error correction via the i/o port would be
great, even
Hi Steve,
Let me build on the VFC idea for a minute. If I am understanding your interest
properly, you are wanting to monitor and track the EFC changes then process that
information as a form of studying the stability to some degree. Is that
correct ?
Well, it occurred to me, admittedly after
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
Attilia
What you want is basically a Shera Board. That design has been around for
quite some time and has served me very well. I have a total of six running
including two controlling Rubidium. There are in my opinion a couple of
problems: not every 4066 works on the design the 18 bit D/A is
Didier Juges wrote:
I can only guess at what a sound card with linearity specs
approaching those of the AD kit would cost, and it's still AC
coupled, and as Poul pointed out, has no long term stability spec.
This *is* an issue.. the audio ADCs have great performance in the sub 1
second sort
Didier Juges wrote:
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
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