The LMb transmitter can be configured to operate as a one touch device with a single power on/off switch on the top panel, or with full access to all operational parameters using the side panel membrane switches and LCD interface. The top panel switch can also be configured to provide a mute or talkback function.This versatility makes the transmitter at home in a wide variety of applications from video production to theater, stage and house of worship. Frequencies are selectable in 100 kHz or 25 kHz steps across a maximum tuning range of 76.7 MHz. This yields a total of 3072 available frequencies across three standard frequency blocks. The tuning range varies in other blocks to meet applicable frequency allocations.The servo bias input accepts mic or line level signals with a wide range of gain adjustment in 1 dB steps. Accurate LED indications on the top panel and a bar graph indicator on the LCD allow precise gain adjustments to be made for the maximum signal to noise ratio and minimum distortion. The limiter in the preamp can cleanly handle signal peaks over 30 dB above full modulation, allowing the input gain to be set high enough to achieve the maximum signal to noise ratio.Compatibility with earlier analog Lectrosonics receivers, Lectrosonics IFB receivers and some receivers from other manufacturers is provided by DSP emulation modes selected in the LCD menu.The housing is an aluminum extrusion with machined aluminum top and control panels, finished with an ultra hard, black electroless nickel finish called ebENi.Digital Hybrid Wireless:is a patented design that combines 24-bit digital audio with an analog FM radio link to provide outstanding audio quality and the extended operating range of the finest analog wireless systems. The design overcomes channel noise in a dramatically different way, digitally encoding the audio in the transmitter and decoding it in the receiver, yet still sending the encoded information via an analog FM wireless link. This proprietary algorithm is not a digital implementation of an analog compandor. Instead, it is a technique which can be accomplished only in the digital domain, even though the audio inputs and outputs are analog signals.Main Features:Covers three standard frequency blocksDigital Hybrid Wireless for compandor-free audio50 mW RF powerCompatibility modes for use with analog receivers25 or 100 kHz tuning steps for up to 3072 selectable frequenciesIntegrated multi-function switch for mute or talkback modesWide range input gain control in 1 dB stepsSpecifications:Operating Frequencies:Block A1: 470.100 – 537.575Block B1: 537.600 – 614.375Block C1: 614.400 – 691.175Block D1: 691.200 – 767.975 (export only)Frequency Selection Steps: Selectable; 100 kHz or 25 kHzRF Power output: 50 mWPilot tone: 25 to 32 kHz; 5 kHz deviation (Digital Hybrid mode)Frequency Stability: 0.002%Deviation: 75 kHz max. (Digital Hybrid mode)Spurious radiation: 60 dB below carrierEquivalent input noise: 120 dBV (A-weighted)Input level: Nominal 2 mV to 300 mV, before limiting Greater than 1V maximum, with limiting.Input impedance: 2k OhmInput limiter: DSP controlled, dual envelope soft limiter with greater than 30 dB rangeGain control range: 44 dB; digital controlModulation indicators:Dual bicolor LEDs indicate modulation of -20, -10, 0 and +10 dB referenced to full modulationLCD bar graphAudio Performance (Digital Hybrid mode)Frequency Response: 90 Hz to 20 kHz (+/-1dB)Low frequency roll-off: 12 dB/octave; 70 HzTHD: 0.2% (typical)Controls:Top panel slide switch; programmable as power, mute, talkback or no (off) functionSide panel membrane switches with LCD interface for power on/off and all setup and configuration controlsAudio Input Jack: Switchcraft 5-pin locking (TA5F)Antenna: Galvanized steel, flexible wireBattery: Two AA; alkaline, lithium, NiMH rechargeableBattery Life:Alkaline: 4.5 hoursDuracell Quantum: 7 hoursEneloop 2400 mAH NiMH: 8 hoursWeight: 5 ounces (141 grams), including lithium AA batteries and wire belt clipDimensions: 3.2 x 2.4 x .8 in. (81 x 61 x 20 mm)Emission Designator: 180KF3E