The SM Series family brings Digital Hybrid Wireless technology to miniature transmitters in several different configurations for essentially any wireless microphone application with a lavalier microphone. The dual battery SMDa model doubles the battery life of the SMa with the same feature set. Switching power supplies throughout the design allow long battery life with NiMH batteries.
Key Features • Digital Hybrid Wireless Technology • Membrane switch control panel with LCD display • 256 synthesized UHF frequencies • 100 mW output power • Wide input dynamic range • DSP based pilot-tone signal • Circulator/Isolator output stage • Splash-proof, machined aluminum housing • Non-corrosive, superhard finish
	Setup and control is simplified with membrane switches and an LCD interface. Multiple functions are clearly marked on the panel, with on-screen prompts on the LCD as reminders when another switch must be held or the selection is locked out. The innovative servo bias input on the standard 5-pin connector provides a programmable, regulated voltage to accommodate a wide variety of electret microphones. Two bicolor LEDs make adjusting input levels for proper modulation easy and accurate. The splash-proofing housing is machined out of a single block of aluminum, which is then plated with a superhard, non-corrosive coating. The SM Series transmitters are equally at home in theatre, television and film where temperature and environmental extremes require superior performance under the most demanding conditions. Digital Hybrid Wireless Digital Hybrid Wireless™ is a revolutionary new 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 best analog wireless systems.
The design overcomes channel noise in a dramatically new way, digitally encoding the audio bitstream in the transmitter and decoding it in the receiver, yet sending the encoded information via an analog FM wireless link. This proprietary DSP algorithm eliminates a compandor circuit and its artifacts, and preserves the RF spectral footprint of analog FM designs to simplify multi-channel coordination with exisiting analog wireless systems.
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Operating Frequencies (MHz) Block 21: 537.600 - 563.100 Block 22: 563.200 - 588.700 Block 23: 588.800 - 607.900; 614.100 - 614.300 Block 24: 614.400 - 639.900 Block 25: 640.000 - 665.500 Block 26: 665.600 - 691.100 Block 27: 691-200 - 716.700 Block 28: 716.800 - 742.300 Block 29: 742.400 - 767.900 Block 944: 944.100 - 951.900
Useful Links •SMDa User Guide (1.7 MB)
Specifications Note: Some specifications apply only when the transmitter is operating in the Digital Hybrid mode. Frequency Range 256 frequencies in 100kHz steps for each 25.5MHz wideblock Channel Spacing 100 kHz RF Power Output 100 mW (nominal) Compatibility Modes Digital Hybrid Wireless (400 Series), 200 Series, 100Series, IFB, Mode 3*, Mode 6* (*other analog brands) Pilot Tone 25 to 32kHz; 5kHz deviation; unique pilot tone frequency foreach selected carrier frequency (400 series mode) Frequency Stability +/-0.001% Deviation: +/-75kHz (max) (400 Series mode) Spurious Radiation 60dB below carrier Equivalent Input Noise -125dBV, A-weighted Input Level If wired for dynamic mic: 0.5mV to 50mV before limiting,greater than 1V with limiting; If wired for electret lavalier: 1.7uA to 170uAbefore limiting, greater than 5000uA (5mA) with limiting; Line Level Input:5.0mV to 500mV (0.5V) before limiting, greater than 15V with limiting Input Impedance Dynamic Mic: 300 ohms; Electret Lavalier: Virtual groundwith servo-adjusted constant voltage bias; Line Level: 2.7k ohms Bias Voltages Fixed 5V at up to 5mA (pin 2); Selectable 2V or 4V (pin 3)for any electret lavalier microphones using jumpers in the connector Input Limiter Soft limiter; 30dB range Gain Control Range 44dB; panel mounted membrane switches Modulation Indicators Dual bicolor LEDs indicate modulation of -20, -10,0 +10dB referenced to full modulation Frequency Response Microphone Input: Variable low frequency roll-off withselectable 3 dB down points of 35, 50, 70, 100, 120 and 150 Hz; high frequencyresponse extends to 20kHz +/-1dB; Line Input: 32 Hz to 20 kHz +/-1dB Signal to Noise Ratio (dB) SmartNR OFF: 103.5 No Limiting, 108w/Limiting; SmartNR NORMAL: 107 No Limiting, 111.5 w/Limiting; SmartNR FULL:108.5 No Limiting, 113 w/Limiting (Note: The dual envelope "soft" limiterprovides exceptionally good handling of transients using variable attack andrelease time constants. Once activated, the limiter compresses 30+ dB oftransmitter input range into 4.5dB of receiver output range, thus reducing themeasured figure for SNR without limiting by 4.5dB.) THD 0.2% (typical, 400 Series mode) Audio Input Jack S witchcraft 5-pin locking (TA5) Antenna Flexible, unbreakable steel cable Battery 1.5 Volt AA lithium or rechargeable NiMH recommended Battery Life 5.75 hours (alkaline); 14.25 hours (lithium),8.5hours with 2500mAh NiMH Weight 3.7 oz with lithium battery Overall Dimensions 2.3" x 2.4" x 0.64" (not including microphone) Emission Designator 180KF3E
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