[tz] CCTF survey on Time and Frequency Metrology - Telecom

[Steven R. Loomis]

> El ene. 27, 2021, a las 3:56 p. m., Brian Inglis <Brian.Inglis at SystematicSw.ab.ca> escribió:
> 
> The telephone and broadcast time data require obsolete Bell 103 modem decoders and suffer from unknown telco or shortwave propagation or ionospheric delays and conditions:
> 
> https://nrc.canada.ca/en/certifications-evaluations-standards/canadas-official-time/computer-time-date#dtime
> 
> https://nrc.canada.ca/en/certifications-evaluations-standards/canadas-official-time/nrc-shortwave-station-broadcasts-chu

Just a note on the word “obsolete” here, FSK modulation remains widely used and implemented.  Modern software such as direwolf <https://github.com/wb2osz/direwolf#decoded-information-from-radio-emissions-for-windows-or-linux-fans> can decode more reliably than prior hardware implementations of Bell 103 compatible demodulators.

Regards,
-s