The KD2BD 9600 Baud Modem
By: John A. Magliacane, KD2BD
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The KD2BD 9600 Baud Modem
By: John A. Magliacane, KD2BD |
|
Schematic 1: Input section of the modem showing post detection low-pass filtering and precision peak detectors.
Schematic 2: Receiver bit clock regeneration circuitry and unscrambler.
Schematic 3: FSK data carrier detection (DCD) and digital automatic frequency control (AFC) circuitry.
Schematic 4: FSK generation circuitry consisting of an LFSR scrambler and low-pass filter.
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