Geosynchronous communications satellites provide a wide variety of services. They carry wideband signals, such as television, and narrowband signals, such as business data networks. This paper describes a signal recognition system for the narrowband signals found on Ku-band satellites. Using readily available equipment, it saves observed signals which are later processed into an observation report. Observed signals are labeled using a decision tree, which is a pattern recognition technique. Each observation report also includes center frequency, bandwidth, and carrier-to-noise ratio. This paper presents the design and implementation of the signal recognition system. Results from the system are included.