Modulation Technique

Question 1

What are characteristics of Modulation?

Answer 1

allow for a continuous wave to carry intelligence( comms. and data).
waveform can be interrupted so that pulses( which represent a code)
pulses are transmitted over a high-frequency carrier wave to carry an audio signal.

Question 2

What is Modulation?

Answer 2

allow the transmission of a message signal inside another signal that can be physically transmitted.

Question 3

What is demodulation?

Answer 3

breaking down a signal from their combined form.

Question 4

What are 3 characteristics of a modulated signal?

Answer 4

amplitude, frequency, phase

Question 5

What is amplitude?

Answer 5

the size of a signal

Question 6

What is frequency?

Answer 6

the number of occurrences of the same event during a time period

Question 7

What is phase?

Answer 7

the time a signal requires to complete a full cycle

Question 8

What is frequency-shift key?

Answer 8

used by the Navy with data circuits at a baud rate (signal speed) of just 75 bps.

Question 9

What is QAM?

Answer 9

Quadrature amplified modulation used by the Navy for digital communications systems, radar systems, and single baseband modulators.
combines 2 AM signals into a signal channel and have the same signals but differs by 90 degrees