The transmitters provide 3072 frequencies selectable in 25 or 100 kHz steps across more than 75 MHz of tuning range in each band.To meet the demand for both extended operating range and extended battery life, the transmitters offer selectable output power at 25, 50 and 100 mW. With higher power output, the operating range is improved at the expense of battery life. When range is not an issue, the power can be reduced to extend the battery life. The transmitters will tune across three standard blocks to make it easy to find clear operating frequencies.The input section features the unique servo bias input circuitry with a standard TA5M type jack for use with electret lavaliere mics, dynamic mics, or line level signals. A DSP-controlled analog audio limiter is employed ahead of the first mic preamp to protect the entire audio chain from overload. The limiter has a range of more than 30 dB for excellent overload protection and a dual release envelope that makes the limiter acoustically transparent while maintaining low distortion. The limiter recovers quickly from brief transients, with no distortion.A special vent in the battery door prevents a vacuum from being created inside the transmitter when it is moved from a warm, damp environment and stored in a cool place. The vent allows air to pass as the pressure equalizes, but blocks the passage of moisture.Main Features:Ultra-lightweight, corrosion resistant housingWater resistant seals for use in damp environmentsLCD interface with lockout optionProgrammable compatibility modes for use with a wide variety of different receiversServo Bias input circuitryIR (infrared) port for fast setupCovers 2 frequency blocks (export versions cover 3 frequency blocks)Update firmware in the field via Micro SD card readerAlternate use as recorder on an internal microSDHC memory cardSpecifications:Operating frequencies:Band A1: 470.100 – 537.575Band B1: 537.600 – 607.975Channel Spacing: Selectable; 25 or 100 kHzRF Power output: Switchable; 25, 50 or 100 mWCompatibility Modes: Digital Hybrid Wireless (NU Hbr), Mode 3, IFBPilot tone (Digital Hybrid Mode): 25 to 32 kHz; 5 kHz deviationFrequency stability: 0.002%Spurious radiation: Compliant with RSS 210 Annex GEquivalent input noise: 125 dBV, A-weightedInput level:If set for dynamic mic: 0.5 mV to 50 mV before limiting; Greater than 1 V with limitingIf set for electret lavaliere mic: 1.7 uA to 170 uA before limiting Greater than 5000 uA (5 mA) with limitingLine level input: 17 mV to 1.7 V before limiting Greater than 50 V with limitingInput 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: Fixed 5 V at up to 5 mA; selectable 2 V or 4 V servo bias for any electret lavaliereGain control range: 44 dB; panel mounted membrane switchesModulation indicators: Dual bicolor LEDs indicate modulation 20, -10, 0, +10 dB referenced to full modulationControls: Control panel w/ LCD and 4 membrane switchesLow frequency roll-off: Adjustable from 35 to 150 HzAudio Frequency Response: 35 Hz to 20 kHz, +/-1 dBWeight (w/ litium batteries):SMWB: 2.7 oz.. (75.9 grams)SMDWB: 3.7 oz.. (105 grams)Overall Dimensions: (without microphone)SMWB: 2.3 x 1.8 x 0.64 inches; 58 x 46 x 16 mmSMDWB: 2.3 x 2.4 x 0.64 inches; 58 x 60 x 16 mmEmission Designator: 180KF3ERecorderStorage media: microSDHC memory cardFile format: .wav files (BWF)A/D converter: 24-bitSampling rate: 44.1 kHzRecording modes/Bit rate:HD mono mode:24 bit – 144 kbytes/s32 bit – 192 kbytes/sSplit gain mode:24 bit – 288 kbytes/s32 bit – 384 kbytes/sInput:Type:Analog mic/line level compatible; servo bias preamp for 2V and 4V lavaliere microphonesInput level:Dynamic mic: 0.5 mV to 50 mVElectret mic: Nominal 2 mV to 300 mVLine level: 17 mV to 1.7 VInput connector: TA5M 5-pin maleAudio Performance:Frequency response: 20 Hz to 20 kHz; +0.5/-1.5 dBDynamic range: 110 dB (A), before limitingDistortion: < 0.035%Operating temperature range:Celsius: -20 to 50Fahrenheit: -5 to 122