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 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 -- time-nuts@febo.com > 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 -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.