This video discusses the basics of a sweep generator, and how it can be used to observe the alignment of IF filters in a receiver. The video starts out by briefly discussing the frequency response characteristics of typical IF transformer cans, and how you and "manually" observe their response using a simple signal generator and a scope. Then, the fundamentals of a sweep generator / oscillator are discussed, and how these can be used to observe the "shape" of the frequency response of a resonant circuit like an IF transformer. The benefits of using a sweep gen, including the ability to observe whether multiple IF transformers in a single IF chain are aligned, or to see the "shape" of the skirts of a filter, is shown. While the video shows just a single IF can as an example, these same techniques can be used to align a receiver's IF by injecting the signal at the appropriate point in the IF, and monitoring its response.