[time-nuts] WWVB Antenna revisited/Spectracom 8182

[Azelio Boriani]

The AM modulation stuff is not affected also by the new WWVB signal.
The WWVB problem affecting timing and frequency receivers is the
180deg phase modulation where the DFC77 is only 13deg and is
randomized so that the mean phase is zero.

On Fri, Mar 23, 2018 at 10:35 AM, Martin Burnicki
<martin.burnicki at burnicki.net> wrote:
> paul swed write:
>> I'll add to the comments the spectracoms are phase tracking receivers and
>> do not work on the new BPSK  signal.
>
> When the German PTB made effort to increase the accuracy and reliability
> of the DCF77 long wave receiver in the 1980s, they implemented thus in a
> way that old receivers of the original AM modulation would not be affected:
> https://www.ptb.de/cms/en/ptb/fachabteilungen/abt4/fb-44/ag-442/dissemination-of-legal-time/dcf77/dcf77-phase-modulation.html
>
> If I remember correctly then there were some discussions with folks a
> NIST when they were going to introduce their new modulation scheme, but
> even though the guys at NIST knew that their approach would break
> existing receivers, they implemented it anyway that way, even though
> other (compatible) ways would have been available. :-(
>
> Martin
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