Lectrosonics SMQA

Lectrosonics SMQA

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 SMQA offers 250 mW RF output power to extend operating range. Switching power supplies throughout the design allow long battery life with NiMH batteries.

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.

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

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

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 wide block

Channel Spacing: 100 kHz

RF Power Output: 100 mW (nominal)

Compatibility Modes: Digital Hybrid Wireless (400 Series), 200 Series, 100 Series, IFB, Mode 3*, Mode 6* (*other analog brands)

Pilot Tone: 25 to 32kHz; 5kHz deviation; unique pilot tone frequency for each 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 170uA before 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 ground with 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 with selectable 3 dB down points of 35, 50, 70, 100, 120 and 150 Hz; high frequency response extends to 20kHz +/-1dB; Line Input: 32 Hz to 20 kHz +/-1dB

Signal to Noise Ratio (dB): SmartNR OFF: 103.5 No Limiting, 108 w/Limiting; SmartNR NORMAL: 107 No Limiting, 111.5 w/Limiting; SmartNR FULL: 108.5 No Limiting, 113 w/Limiting (Note: The dual envelope "soft" limiter provides exceptionally good handling of transients using variable attack and release time constants. Once activated, the limiter compresses 30+ dB of transmitter input range into 4.5dB of receiver output range, thus reducing the measured figure for SNR without limiting by 4.5dB.)

THD: 0.2% (typical, 400 Series mode)

Audio Input Jack: Switchcraft 5-pin locking (TA5)

Antenna: Flexible, unbreakable steel cable

Battery: 1.5 Volt AA lithium or rechargeable NiMH recommended

Battery Life: 1.75 hours (alkaline); 7.5 hours (lithium), 5 hours 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