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Volumes

1. Vol 1 FM & Angle Modulation — Vol 1: The Other Two Knobs Are the Same Knob Frequency and phase are not two things you can modulate. They are one thing, expressed two ways — and the sidebands that result are infinite in number, with a beautiful checkable fact hiding at a modulation index of 2.405.
2. Vol 2 FM & Angle Modulation — Vol 2: Why Anyone Put Up With It FM costs you bandwidth, complexity, and infinite sidebands. What it buys is a limiter that throws lightning away, an amplifier that doesn't have to be linear, and a channel that is either perfect or silent.