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

paul swed paulswedb at gmail.com
Mon Oct 22 02:03:09 UTC 2012


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 <dale at 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 at 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.
>



More information about the Time-nuts_lists.febo.com mailing list