Tom I shifted to 60 Khz using a synth Gen. The 60 Khz for the encoder comes from another sig gen and they are all locked to an Rb. Yes thats a sucker price, at least for me. Regards Paul.
On Wed, Oct 24, 2012 at 11:05 PM, Tom Miller <[email protected]> wrote: > Hello Paul, > > I guess you tested it at 57 kHz? Were you able to get it to work with your > simulator at the normal frequency? > > Does anyone have details on the test mode? > > > I just picked up $3 worth. > > > Regards, > Tom > > > > ----- Original Message ----- From: "paul swed" <[email protected]> > To: "Discussion of precise time and frequency measurement" < > [email protected]> > 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 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 looking at the RDS decoders and the data seemed to be differential. > Set it aside at that point. I am curious as to why it did not work. Like > everyone here would be great if it worked.... > Regards > Paul > WB8TSL > > On Sun, Oct 21, 2012 at 10:55 PM, Dale J. Robertson <[email protected]> > wrote: > > 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, 2012, at 10:03 PM, paul swed <[email protected]> wrote: >> >> > 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 <[email protected]> >> wrote: >> > >> >> 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 8th >> order >> >> bandpass filter followed by a costas loop and provides a phase >> synchronous >> >> regenerated carrier. What's interesting is that the switched cap >> bandpass >> >> filter and the synchronous detector are both driven by clocks derived >> from >> >> a local crystal oscillator which is spec'd at 4.332 or 8.664 MHz (76 or >> 152 >> >> X carrier chosen by a mode select pin) I'm thinking it should be >> possible >> >> to use a 4.56 or 9.12 MHz crystal or external clock to use this chip >> as-is >> >> on 60 KHz. >> >> Have a look at the data sheet and tell me why I'm full of it. >> >> Jameco is closing out these chips in DIP-16 at a nickel apiece, >> >> $3.00/hundred. >> >> >> >> Dale NV8U >> >> >> >> >> >> ______________________________****_________________ >> >> time-nuts mailing list -- [email protected] >> >> To unsubscribe, go to >> >> https://www.febo.com/cgi-bin/****<https://www.febo.com/cgi-bin/**> >> >> mailman/listinfo/time-nuts< >> https://www.febo.com/cgi-bin/**mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >> > >> >> and follow the instructions there. >> > ______________________________**_________________ >> > time-nuts mailing list -- [email protected] >> > To unsubscribe, go to >> https://www.febo.com/cgi-bin/**mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >> > and follow the instructions there. >> >> ______________________________**_________________ >> time-nuts mailing list -- [email protected] >> To unsubscribe, go to >> https://www.febo.com/cgi-bin/**mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> >> and follow the instructions there. >> >> ______________________________**_________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> > and follow the instructions there. > > > ______________________________**_________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/** > mailman/listinfo/time-nuts<https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts> > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
