[time-nuts] WWVB BPSK patent status

paul swed paulswedb at gmail.com
Fri Aug 8 14:45:30 EDT 2014

Mike not sure what the above means. As to the FPGA I suspect that may be a
good approach i am messing with various micros and languages and they all
sort of run out of steam especially when you need to be able to use numbers
of instructions to make a DPLL.
I did build a hardware counter that I could speed up slowdown or leave the
same so that I could essentially build a phase accumulator.
But not sure what patents are going to cause a problem.

On Fri, Aug 8, 2014 at 10:01 AM, Mike Harpe <mike at mikeharpe.com> wrote:

> From my reading of the archives and research it appears that the design for
> a BPSK WWVB receiver probably has a patent conflict.
> Isn't this a rehash of the old Heathkit patent on radio clocks that held
> back their adoption for years?
> I have begun work on a BPSK receiver for WWVB using an FPGA.
> Someone should look into why the NIST did this at all since the receiver
> design got a patent slapped on it right away.
> Mike Harpe, N4PLE
> Sellersburg, IN
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