Jim Lux wrote:
That's not precisely true. You can get a frequency estimate that is
substantially more precise than 1/T if the snr is high. Consider
super-resolution in an interferometer which is mathematically similar. What
you give up is ambiguity. Probably one of the oldest techniques is
Hi
I suspect you will find that the winding technique does indeed matter in terms
of how a good an antenna you get. There's more to it than coil Q.
Bob
On Oct 13, 2010, at 3:38 PM, Brooke Clarke wrote:
> Hi:
>
> I've wound a ferrite loop antenna tuned for WWVB based on the Russian ferrite
>
Hi
Here's pretty much how it works:
Integrating capacitor:
You rarely if ever see one in an oven controller that's actually acting as an
integrator in the control sense. What you do see are caps to roll off the AC
gain of the loop to drop noise. In other words the time constant is way to
shor
Hi:
I've wound a ferrite loop antenna tuned for WWVB based on the Russian
ferrite rods and it's much longer than the stock antenna that comes with
the C-Max WWVB receiver. I could just replace the old antenna with the
new one, but would rather come up with some way to characterize the
relati
Group,
The primary controller issue is too little reset because the
integrating capacitor is too small or bad. After that comes
too much gain.
Power lead resistance would reduce the gain. Conversely, high
voltage would increase gain.
Don't think extra insulation is a stability issue, unless it's
Thanks for that Jim,
... I see that Prony's method bears some relationship to AR
deconvolution. Interesting...
http://www.dsprelated.com/dspbooks/filters/Prony_s_Method.html
Dr. David McClain
Chief Technical Officer
Refined Audiometrics Laboratory
4391 N. Camino Ferreo
Tucson, AZ 85750
ema
David McClain wrote:
Hi Jim,
Can you give any more precise hints, e.g., links to articles? You
mentioned Prony, Music, and Espirit. You caught my attention with your
analogy to interferometry...
Yes.. many of the spectral estimation techniques share a common
mathematical basis with directi
David McClain wrote:
Hi Jim,
Can you give any more precise hints, e.g., links to articles? You
mentioned Prony, Music, and Espirit. You caught my attention with your
analogy to interferometry...
Prony has been around for centuries (first used to predict tides in the
18th century, as I reca
Hi Jim,
Can you give any more precise hints, e.g., links to articles? You
mentioned Prony, Music, and Espirit. You caught my attention with
your analogy to interferometry...
Cheers,
Dr. David McClain
Chief Technical Officer
Refined Audiometrics Laboratory
4391 N. Camino Ferreo
Tucson, AZ
On Oct 13, 2010, at 12:32 AM, David McClain
wrote:
> Hello John,
>
>> Well, not entirely -- it's common enough to see FFT applications that
>> compute frequency readings at sub-bin precision by tracking atan(Q,I) across
>> multiple time records. That is a well-defined thing to do, since the
That's not precisely true. You can get a frequency estimate that is
substantially more precise than 1/T if the snr is high. Consider
super-resolution in an interferometer which is mathematically similar. What
you give up is ambiguity. Probably one of the oldest techniques is that of
Prony,
Greetings,
I may be missing something here but when you receive a signal in the AM mode
the audio is derived from the transmitted carrier. Even if your local osc
moves around the audio is generated from the difference between the
transmitted carrier and the audio sidebands.
I have found it qui
Hi
Should have been two out of three things ...
Bob
On Oct 13, 2010, at 6:58 AM, Bob Camp wrote:
> Hi
>
> Controller cycling is often a result of one of two things:
>
> 1) Resistance in the power lead
> 2) Extra insulation / dead air
> 3) Internal controller issues
>
> There are a few othe
Hi
Controller cycling is often a result of one of two things:
1) Resistance in the power lead
2) Extra insulation / dead air
3) Internal controller issues
There are a few other possibilities, but they are remote enough that you are
unlikely to ever come across them. There's no advantage to bui
On 10/13/2010 05:32 AM, Jim Lux wrote:
On Oct 12, 2010, at 6:09 PM, Magnus Danielson
wrote:
Hi Bob and Dave,
On 10/13/2010 02:57 AM, Bob Camp wrote:
Hi
Yes it is a reasonable expectation as long as you don't have a lot of drafts. A
good TCXO can get down to sub 0.1 ppb over that period.
OTOH, I do see the virtue in the phase examination approach... A
longer FFT would average over any short-term variations in a
cyclostationary process. If you take shorter FFT's you can catch the
signal in the act of drifting, and perhaps use the phase examination
to augment your frequency e
Hello John,
Well, not entirely -- it's common enough to see FFT applications that
compute frequency readings at sub-bin precision by tracking atan
(Q,I) across
multiple time records. That is a well-defined thing to do, since the
Yes, indeed, I am familiar with that technique from my SIGINT
Sorry, we must be talking past one another... I'm measuring the 100
Hz sideband from 10 MHz WWV in AM demodulation. I should see about 5
mHz cyclic drift, and I wasn't seeing it. I now know that is because
the FFT bin size was about 11 mHz wide and the "interpolated" peak
frequency assumes
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