Does the digital signal have frequency? if yes is it equal to the frequency of analog signal?

Question

i want to make digital mobile jammer for this reson i need answer of this question.

Answer 1

Yes, a digital signal can be thought of as a special kind of analog signal which switches between two fixed voltage levels. It is also known as a square wave, or more usually a complex pulse wave.

A square wave contains the fundamental frequency (=switching frequency) and all the odd-numbered harmonics (3x, 5x, 7x, etc.). A pulse wave contains a complex set of even and odd harmonics.