Amazon.com description: Product Description: A hobbyist's guide to radio-frequency circuit theory, experimentation, and practical applications. This hands-on introduction aims to demystify that part of the electromagnetic spectrum known as the radio frequency band, explaining in nontechnical language what RF is and how it is different from other electromagnetic frequencies. The book covers the basics of receiver operation, the proper use and repair of components in RF circuits, and principles of low-frequency to microwave radio signal propagation. It also shows hobbyists how to design and build their own RF amplifiers, pre-selectors, signal generators, inductor coils, antennas, microwave circuits, and other devices.