I have a few questions regarding the spectrum of FM.... 1. What is the equation that predicts where the sidebands will occur in an FM signal given a certain FM rate and deviation? 2. If I have an FM signal with a rate of 16 KHz and a deviation of 5 KHz and I look at the signal on a spectrum analyzer I am seeing a signal at the carrier frequency and then the largest sidebands are occuring at +16 KHz and - 16 KHz away from the carrier. I am not understanding why. 3. Assume an FM signal of 200 MHz with a deviation of 5 KHz and a rate of 4 KHz. On the spectrum analyzer I see a signal at 200 MHz and the largest sidebands occur at 200 MHz + 4KHz and 200 MHz -4KHz. If I create a CW wave at either 200 MHz + 4KHz or 200 MHz - 4KHz, it seems to cause alot of interference to the point that the receiver is not able to correctly receive the transmitted information. What is going on here? Thanks for any input.