The FMSD-1 is a high quality VHF FM Stereo demodulator with precision metering on the front panel. The FMSD-1 is used for FM signal monitoring on-site or for testing the audio and modulation quality of studio encoding systems, (Stereo encoders or transmitter equipment). The unit can be used in conjunction with other test equipment such as the Lindos test set or on its own. The Unit includes an Audio Test Meter section and a Peak Modulation Test Section on the front panel.