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" <[email protected]> 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 -- [email protected] > 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 > _______________________________________________ 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.
