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Posted by John Davis on January 15, 2025 at 21:54:10.
In Reply to: Re: LED driver frequencies in LW bands? posted by John Davis on January 15, 2025 at 20:53:26.
{quote}...and can easily be taken for power line carriers.[/quote]
I should point out that PLCs ought not be dismissed as hypothetical sources, as the US power grid is still heavily dependent on this pre-third-world technology...a term I coined mainly to irritate my brother wizards in the IEEE Wichita Section, who (for ample reasons) are predominantly into power transmission out here in the Land of Renewable Energy. Although some electric operators (like MEAG back home in Georgia) derive nice additional revenue from excess data capacity resulting from their inherently greater initial investment in fiber optics for system control and monitoring, most still depend on PLCs for go/no-go indications of transmission line integrity (continuous carrier only), some convey their status with a periodic "heartbeat" (an off-on keying sequence or an FSK pattern repeated every several minutes), a few use slow data transmissions from time to time, and I'm told a few systems can still do voice comms between substations via companded SSB or narrow FM, although I suspect that approach is extremely seldom used any more. I've never copied an instance of it myself, anyway.
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