I read this:(adsbygoogle = window.adsbygoogle || []).push({});

=====

Nyquist Interval of the opening chapter Historical Background:

"If the essential frequency range is limited to B cycles per second, 2B was given by Nyquist as the maximum number of code elements per second that could be unambiguously resolved, assuming the peak interference is less half a quantum step. This rate is generally referred to as signaling at the Nyquist rate and 1/(2B) has been termed a Nyquist interval."

=====

I understand how the Nyquist theorem applies to signals that are sampled. I understand aliasing to a certain degree. What I do not understand is how it matters to signals like the telegraph, when there is no sampling going on.

- Why does a channel for things like telegraph, what the bandwidth is? 1 Hz is enough to represent a pulse.

- Why do we worry about the bandwidth of a telegraph, with respect to the number of pulses per time period? These aren't sampled, so how can aliasing occur? Why can't we pulse a million of them a second over 1Hz?

- Related, why does FSK/PSK have an advantage over ASK/OOK? Why not just take 1 Hz of bandwidth and put a carrier up and take it down a million times a second?

Please answer so that I can understand intuitively. I've seen the formulas, but nobody can explain to me why it is that way.

Thank you

**Physics Forums - The Fusion of Science and Community**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Nyquist, and also ASK

Loading...

Similar Threads - Nyquist | Date |
---|---|

Nyquist and FM and Signal Mixing... | Aug 17, 2017 |

How to draw Nyquist plot of it | Sep 15, 2016 |

Understanding quadrature sampling | May 26, 2015 |

Question about the Nyquist sampling rate | Mar 5, 2015 |

Nyquist Sampling Rate | Nov 1, 2014 |

**Physics Forums - The Fusion of Science and Community**