Designed for wet or dusty environments, the WM transmitter features O-ring sealed battery compartments and input jack, a compression sealed antenna port and gasket sealed control panel and back cover. Dual AA batteries provide twice the operating time of earlier watertight transmitter designs. Larger membrane switches and control panel and a highly visible, backlit LCD enhance the user interface.Main Features:Selectable output power to maximize battery life or operating rangeMachined aluminum, corrosion resistant housingWater resistant seals for use in wet environmentsLCD interface with lockout optionProgrammable compatibility modes for use with a wide variety of different receiversServo Bias input circuitry with selectable voltageSpecifications:Channel Spacing: 100 kHzFrequency selection: Control panel mounted membrane switchesRF Power output: Switchable; 50, 100 or 250 mWCompatibility Modes (6) Digital Hybrid Wireless (400 Series), 200 Series, 100 Series, Mode 3, Mode 6, IFBPilot tone: 25 to 32 kHz; 5 kHz deviation (in 400 Series Hybrid Mode)Frequency stability: 0.002%Deviation: 75 kHz max. (in 400 Series Mode)Spurious radiation: 60 dB below carrierEquivalent input noise: 125 dBV, A-weightedInput level:Dynamic mic: 0.5 mV to 50 mV before limiting. Greater than 1 V with limiting.Electret lavaliere mic: 1.7 uA to 170 uA before limiting. Greater than 5000 uA (5 mA) with limiting.Line level input: 17 mV to 1.7 V before limiting. Greater than 5 V with limiting.Input impedance:Dynamic mic: 300 OhmsElectret lavaliere: Input is virtual ground with servo adjusted constant current biasLine level: > 2.7 k OhmsInput limiter: Soft limiter, 30 dB rangeBias voltages: Selectable; 2V, 4V and OffGain control range: 44 dB; panel mounted membrane switchesModulation indicators: Dual bicolor LEDs indicate modulation of 20, -10, 0, +10 dB referenced to full modulationControls: Control panel with LCD and four membrane switches