OK,
According to the Phillips original data sheets quick reference chart the
chip wants to see around 1mV of input signal.
The output will not be a digital data stream with ones and zeros
corresponding to the phase of the input.
Instead, from what I can glean from the datasheet, it will be a pulse of
period 60KHz/48 every time the phase flips. Additionally there are outputs
of the costas loop recovered carrier, recovered carrier divided by 48 and a
quality indicator which I believe indicates that the loop is 'locked up'
I believe that to recover the data stream (assuming there's a good signal
etc.) you just need to feed the output into a toggle flip flop. The polarity
of the data at this point would be ambiguous and some other aspect of the
encoding (framing sync, checksum etc.) would have to be used to establish
proper data polarity.
It seems there are several possible uses of this chip. It might make a good
start on the 'brains' of an automatic phase flipper to be inserted into boat
anchor WWVB based frequency standards. The 60KHz output could form the basis
for an 'on the cheap' scratch built frequency standard.
I hope to get my chips pretty soon so I can see if any of this is really
real.
Dale NV8U
-----Original Message-----
From: paul swed
Sent: Monday, October 22, 2012 10:29 PM
To: Tom Miller ; Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier
regenerator ?
I was giving it 1000uv. Thats why I say it needs a lot.
On Mon, Oct 22, 2012 at 9:00 PM, Tom Miller <[email protected]> wrote:
----- Original Message ----- From: "paul swed" <[email protected]>
To: "Discussion of precise time and frequency measurement" <
[email protected]>
Sent: Monday, October 22, 2012 8:35 PM
Subject: Re: [time-nuts] WWVB New Modulation five cent demodulator /
carrier regenerator ?
To switch correctly at the zero point I sample the plus of the secondary
with a LM339 comparator (only using 1 section) and feed that to a SXB
micro
running at 40 Mhz. Detect the zero and switch if I want. The micro
programs
in basic and screams along. So I can flip at any rate or create patterns
as
easily as I can think them up. Its seriously dumb, simple, and stupid. But
it lets me run tests without waiting for wwvb. I do attenuate the output
signal to about 60 uv. Generally what I see on the east coast during the
day.
==============================**==
Hi Paul,
Reading the spec, I think the chip wants to see about 500 UV RMS. Is that
correct?
At three cents each, it sure would be nice to find another use for it.
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