Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier regenerator ?

2012-10-25 Thread paul swed
> 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

Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier regenerator ?

2012-10-24 Thread Tom Miller
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

Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier regenerator ?

2012-10-23 Thread Dale J. Robertson
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

Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier regenerator ?

2012-10-22 Thread paul swed
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

Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier regenerator ?

2012-10-22 Thread Tom Miller
- 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

Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier regenerator ?

2012-10-22 Thread paul swed
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

Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier regenerator ? (Dale J. Robertson)

2012-10-22 Thread David I. Emery
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

Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier regenerator ?

2012-10-22 Thread Dale J. Robertson
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

Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier regenerator ? (Dale J. Robertson)

2012-10-21 Thread johncroos
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

Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier regenerator ?

2012-10-21 Thread Dale J. Robertson
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

Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier regenerator ?

2012-10-21 Thread paul swed
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

Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier regenerator ?

2012-10-21 Thread Dale J. Robertson
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

Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier regenerator ?

2012-10-21 Thread Brooke Clarke
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

Re: [time-nuts] WWVB New Modulation five cent demodulator / carrier regenerator ?

2012-10-21 Thread paul swed
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

[time-nuts] WWVB New Modulation five cent demodulator / carrier regenerator ?

2012-10-21 Thread Dale J. Robertson
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