3 ms·

The only signal that contains only 1 Hz and no other frequencies is a perfect 1 Hz sine wave. As soon as you start modulating the amplitudes away from that sine

The only signal that contains only 1 Hz and no other frequencies is a perfect 1 Hz sine wave. As soon as you start modulating the amplitudes away from that sine wave, you're introducing content at higher frequencies. You can use that higher frequency content to transmit information at more than 1 bit per second, but you're not exactly using the 1 Hz signal to transmit information.

megous 3y ago
https://en.wikipedia.org/wiki/Single-sideband_modulation https://en.wikipedia.org/wiki/Single-sideband_modulation No need for higher frequency content. But SNR will have to be good enough.
- BenjiWiebe 3y ago
  SSB still makes other frequencies. Viewed on a waterfall, it's just half of AM, minus the carrier. Still occupies a range of frequencies, approx half of what AM does.
  - megous 3y ago
    No higher frequency content above the carrier.
    - thfuran 3y ago
      10 bits is at least plausible, but if you want to try to transmit .1 kbps with no frequency content over 1Hz, you're going to need the mother of all SNRs.