Model train multichannel control - uses PAM and pulse width modulation to convey control signals or data to train with sliding contacts

摘要

The multichannel control, for model trains or similar applications where sliding contacts are used in the transmission path, uses pulse amplitude modulating and pulse width modulation to convey the control signals (or data) to the train (or receiver). The pulse amplitude selects the variable to be altered and the pulse width decides in the magnitude of the selected variable or vice versa. During control transmission the power supply to the train is interruped to prevent it interfering with the signals.