Heddy Lammar

TRANSMISSION TECHNIQUE IN THE SPREAD MIRROR (WI – FI)

In 1941 Transmissions were vulnerable, radio waves were not enough, and he had the idea of transmitting a message in small parts with signal transmission, frequency shifting, and a pseudo-random pattern. Transmission times were short, irregularly spaced so that if you didn’t know the code or change channels you couldn’t corrupt the code. The message sent in the case of the remote control, sent a binary message, modulating the carrier frequency with a low signal, allowing the addition of tuned filters to eliminate parasitic frequencies. The receiver was tuned to receive those frequencies using the same code shift, frequency hopping synchronously with the transmitter. That is the Frequency Hopping Spread Spectrum (FHSS) which is what gives rise to Wi-Fi or wireless transmissions.