Hi
Backing up a bit …..
The WWVB modulation is *very* predictable. Once you have lock,
you can guess just about every phase reversal you will see. If you
have an “approximate lock” ( = a time pre-load that is within a few
seconds) you can guess a lot of them. (There were a few aux data bits
Ray Yes you have it correct. The flipper is bidirectional. It either adds
flips or removes them.
It does read the nema second per minute in the 59th second. Then depends on
the 1 pps for an accurate phase flip. The flip is 100 ms into the second
and by propagation delay to the east 5-7ms. Though
Bob kb8tq writes:
> It also *very* much depends on the stability of your local reference and the
> stability of the ionosphere. Unless both are 'pretty darn good' a hundred
> second
> integration is utter nonsense
This is why Loran-C was so superior to any and all CW based
On 7/31/20 11:25 AM, Scud West wrote:
Back in December 2018 there was a WWVB thread.
From Poul-Henning's post on 2018-12-05 quoting John N8UR:
"While everyone's been talking :-) , I recorded some WWVB IQ data for
folks to play with. You can download it from
http://febo.com/pages/wwvb/
The
The coloring is from matplotlib. Sometimes I forget what's what. I'm
really not using pandas for much here. Most of the code in plotting a
minute of data is in making it look fancy.
import numpy as np
import matplotlib.pyplot as plt
import matplotlib.ticker as tkr
import matplotlib.mlab as
Bob kb8tq writes:
>The WWVB modulation is *very* predictable. Once you have lock,
>you can guess just about every phase reversal you will see.
>[...]
>The point of this being that you *could* pre-flip the data before it
>went into a buffer. That way the buffer integration time constant
The A15 board in one of my 5065s is in bad shape, and I have started
to look at designing a plug-compatible replacement board.
The main reason I dont just repair/replace the A15 is that
I want to find out how much instability the PSU contributes.
The outline idea currently is:
LM399
Hi
It also *very* much depends on the stability of your local reference and the
stability of the ionosphere. Unless both are “pretty darn good” a hundred second
integration is utter nonsense
Bob
> On Jul 31, 2020, at 5:00 PM, Poul-Henning Kamp wrote:
>
>
> Bob kb8tq writes:
>
>>
On Thu, 30 Jul 2020 21:56:42 +1000
glen english LIST wrote:
> - a double-double-double could work, but my experience is for x2 x2 x2 I
> really need to filter well at each stage to avoid sum and difference
> products.. which might be OK for this application , especially if I
> filter really
