[time-nuts] KD2BD WWVB receiver/decoder in QEX
paulswedb at gmail.com
Sat Nov 21 11:32:26 EST 2015
Its a good article and Reginald and I have been discussing offline. If you
like lots of opamps its very good. Its pretty much all discreet easy to
wire parts. But a lot of them. We have looked at the 10 Mhz VCO and even
calling Bomar and its not available so will guess like many projects its
what was on hand. Same with the very wide range of opamps.
That said its a very up to date wwvb receiver.
On Fri, Nov 20, 2015 at 6:29 PM, Tim Shoppa <tshoppa at gmail.com> wrote:
> Nov/Dec 2015 QEX has KD2BD's WWVB-based standard and decoder nicely written
> 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:
> Tim N3QE
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