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

[paul swed]

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 <tmiller at skylinenet.net> 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" <paulswedb at gmail.com>
> To: "Discussion of precise time and frequency measurement" <
> time-nuts at 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 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 <dale at nap-us.com>
> 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 <paulswedb at gmail.com> 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 <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
>> >>
>> >>
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