3 ms·
With more recent techniques, a much higher bitrate could be sustained. I think it would be possible to supply a ~100 kbit/s broadcast channel on longwave that
by retrac 5y ago
With more recent techniques, a much higher bitrate could be sustained. I think it would be possible to supply a ~100 kbit/s broadcast channel on longwave that could be received in most of North America reliably, with a simple IC receiver.
I'm not exactly sure what you'd use that for, admittedly.
- wglb 5y agoThat would consume a significant amount of spectrum, like on the order of 200,000 kHz or 0.2 mHz.
- retrac 5y agoDRM+ broadcasts digital audio over medium, short, and also long wave. It has 30 - 180 kbit/s depending on coding, in a 100 kHz channel. Using 10 or 50 kHz down there as a data broadcast channel would not be an issue, as it's not like the longwave band is exactly crowded.
- Johnythree 5y agoHave you ever listened to VLF with a good receiver and antenna? It is chock full of signals.
- wglb 5y agoSadly, it appears that many of the beacons are going away: https://www.dxinfocentre.com/ndb.htm https://www.dxinfocentre.com/ndb.htm
- mikewarot 5y agoYou're not going to fit 100kbits/second into the few hertz of bandwidth at 60,000 Hz that WWVB currently uses to send 1 bit per second, no matter how magic the technology is.