[time-nuts] KD2BD WWVB receiver/decoder in QEX
Rob Sherwood.
rob at nc0b.com
Sat Nov 21 15:40:44 UTC 2015
This circuit can cope with the phase modulated time data and still provide a frequency tracking signal for timebase adjustments? My Symmetrical WWVB receiver is useless now. I had to go to GPSDO to validate the operation of my two rubidiums. Rob, NC0B
Sent from my iPad
> On Nov 20, 2015, at 7:00 PM, "Tim Shoppa" <tshoppa at gmail.com> wrote:
>
>
>
> Nov/Dec 2015 QEX has KD2BD's WWVB-based standard and decoder nicely written
> up.
>
> His decoder has BPSK demodulation capability, BPSK output is available but
> for the most part it detects the BPSK only to then remove BPSK prior to
> carrier phase tracking.
>
> Starts with a tuned loop antenna colocated with a 40dB preamp, then a bunch
> of analog circuitry consisting of discrete NPN's, CMOS SPDT switches and
> op-amps, 0.025Hz low-pass filter, disciplining a 10MHz TCXO. There is some
> digital logic (HC390's) to divide the 10MHz TCXO down and produce various
> standard frequencies, as well as a PIC to decode and display the WWVB time
> code. Baseband WWVB signals are used to modulate a 1kHz audio tone for
> aural monitoring.
>
> Recommended reading!!! Also there is KD2BD's web description of the same
> receiver as applied to FMT's: http://www.qsl.net/kd2bd/fmt-methodology.html
>
> Tim N3QE
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>
>
>
> --
> If this email is spam, report it to
> https://support.onlymyemail.com/view/report_spam/ODExMjI6MTgyNzQ4NTU3ODpyb2JAbmMwYi5jb206ZGVsaXZlcmVk
>
More information about the Time-nuts_lists.febo.com
mailing list