Radio Frequency In this lesson you will learn

Radio Frequency • In this lesson you will learn: – The relationship between (RF) transmitters and receivers – Resonance - the underlying scientific factor that allows the precise transmission frequency of a signal – Engineering notation Copyright Carnegie Mellon Robotics Academy all rights reserved

The kettledrum • If a trumpet, and a kettledrum tuned to the note of “E”, were placed in the same room when the trumpet were played the “E” note the sound wave would leave the trumpet and travel through the air. The air molecules would then vibrate against the surface of the drum and the drum would vibrate with an audible sound. Copyright Carnegie Mellon Robotics Academy all rights reserved

What is resonance? • Resonance is the induction on a physical object of vibrations by a vibrating force having the same frequency. A dramatic example of resonance is demonstrated by the Tocoma Narrows Bridge disaster. Click the photo at the left to see an example of resonance. Copyright Carnegie Mellon Robotics Academy all rights reserved

New terms • • Crystal - An electronic device, such as an oscillator or detector, using such a material. Oscillator – To oscillate means to swing back and forth with a steady, uninterrupted rhythm. An oscillator is a device or mechanism for producing or controlling oscillations; especially : one (as a radiofrequency or audio-frequency generator) for producing an alternating current Copyright Carnegie Mellon Robotics Academy all rights reserved

Resonance in electronic circuits Copyright Carnegie Mellon Robotics Academy all rights reserved