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 cents each so I purchased some.
Moved the clock up frequency for 60 Khz and injected the 60Khz
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 cents each so I purchased some.
Moved the clock up frequency for 60 Khz
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
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
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 not track
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 DPSK
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] WWVB New Modulation five cent demodulator
- Original Message -
From: paul swed paulsw...@gmail.com
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Monday, October 22, 2012 8:35 PM
Subject: Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier
regenerator ?
To switch
, 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
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
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 d...@nap-us.com wrote:
While looking for other stuff I came across the data sheet for the NXP
Semi
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
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,
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
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
15 matches
Mail list logo
