10 kHz to 1280 MHz 0.1 Hz resolution -139.9 to +13 dBm High spectral purity AM/FM GPIB Spectral purity is the key contribution of the 8662A signal generator, making it ideal for many radar, satellite communication, and phase noise measurement applications. It offers versatile AM/FM, using either internal 400 Hz and 1 kHz rates or externally applied modulating signals.