I don't subscribe to QEX but it seems that ARRL has kindly provided an
easily accessible online copy of the noted article here:
http://www.arrl.org/files/file/QEX_Next_Issue/2015/Nov-Dec_2015/Magliacane.pdf
Downloaded and made ready for reading later today, thank you for posting
the "head's up" on KD2BD's article.
cheers, Graham ve3gtc
On 2015-11-20 23:29, Tim Shoppa 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
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