Single Sideband Suppressed Carrier (SSB-SC): Single Sideband Suppressed Carrier (SSB-SC) modulation was the basis for all long distance telephone communications up until the last decade. It was called “L carrier.” It consisted of groups of telephone...
What is Single Side-band? Before you can understand what SSB is, you must understand how audio is transmitted via radio waves. The method by which audio is impressed on a radio signal is called modulation. The two types of modulation that most people are familiar with...
Quadrature Amplitude Modulation (QAM)- Brief Discussion I & Q modulation, A.K.A., QAM, is a method for sending two separate (and uniquely different) channels of information. As you know, the carrier is shifted to create two carriers: sin and cos versions. The two...
Modulation/Demodulation is a Nonlinear Process where Two Sinusoids are Multiplied (F1 x F2). The Product of this Multiplication–in the Time Domain–is a wave whose Amplitude is: a(X) = a(F1) X a(F2). However, in the Frequency Domain there is an Addition and...
So What Is A Frequency Synthesizer? The answer to that is easy, it is a programable frequency multiplier, usually using digital logic integrated circuits. The synthesizer is arranged to multiply a reference frequency by a programable amount to achieve just about any...
