> To: "Discussion of precise time and frequency measurement" <
> time-nuts@febo.com>
> Sent: Sunday, October 21, 2012 11:08 PM
>
> Subject: Re: [time-nuts] WWVB New Modulation five cent demodulator /
> carrier regenerator ?
>
>
> Jameco had them on sale for 20 c
of precise time and frequency measurement"
Sent: Sunday, October 21, 2012 11:08 PM
Subject: Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier
regenerator ?
Jameco had them on sale for 20 cents each so I purchased some.
Moved the clock up frequency for 60 Khz and injecte
y 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 demodulat
t; 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
- Original Message -
From: "paul swed"
To: "Discussion of precise time and frequency measurement"
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 zer
ple one myself.
> I'll probably have mine just toggle the phase every 100 ms initially.
> Dale
>
> -Original Message- From: paul swed
> Sent: Sunday, October 21, 2012 11:08 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] W
On Mon, Oct 22, 2012 at 02:16:19AM -0400, johncr...@aol.com wrote:
> Dale -
>
> To your question re BPSK and DPSK. In both modes the phase shift is 180
> degrees.
> Straight PSK has the issue of determining the 1's from the 0's, at the
> receiver as there is
> no phase reference.
> To avoid this
cussion of precise time and frequency measurement
Subject: Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier
regenerator ?
Jameco had them on sale for 20 cents each so I purchased some.
Moved the clock up frequency for 60 Khz and injected the 60Khz BPSK. (I
built a simulator) It did
Dale -
To your question re BPSK and DPSK. In both modes the phase shift is 180
degrees.
Straight PSK has the issue of determining the 1's from the 0's, at the
receiver as there is
no phase reference.
To avoid this DPSK encodes the the serial data stream prior to the
bi-phase modulator.
As I r
Paul,
Did you move the frequency up by driving it with a function generator or by
using a 4.56 or 9.12 MHz crystal? I'm thinking that maybe the quadrature phase
lock is accomplished by an internal varacter or some other mechanism for
'pulling' the on-chip oscillator. That wouldn't work if you we
Jameco had them on sale for 20 cents each so I purchased some.
Moved the clock up frequency for 60 Khz and injected the 60Khz BPSK. (I
built a simulator) It did not track and in general produced noise. I
understand you can use 2 frequencies to drive it and I tried both from
synth gens.
I was lookin
Paul,
I'm trying to understand your reference to 'differential BPSK' all the RDS
references I've looked at indicate a 180 degree phase shift just like WWVB. I'm
thinking that differential and antipodal are just different words for the same
thing
Regards,
Dale
Sent from my iPhone
On Oct 21, 20
Hi Dale:
Is it as simple as changing the clock to operate at 60 kHz?
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
Dale J. Robertson wrote:
While looking for other stuff I came across the data sheet for the NXP Semi
SAA6579.
The chip is a pur
Because it use differential BPSK. I have a number of them and was trying
it. There is a test pin that might make it useful.
Regards
Paul
WB8TSL
On Sun, Oct 21, 2012 at 9:14 PM, Dale J. Robertson wrote:
> While looking for other stuff I came across the data sheet for the NXP
> Semi SAA6579.
> The
While looking for other stuff I came across the data sheet for the NXP
Semi SAA6579.
The chip is a purpose built demodulator for RDS (which utilises a 57 KHz
ABPSK subcarrier on FM broadcast that is) used for traffic, song info
etc. This chip has an anti-aliasing front end low pass filter and an
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