Lectrosonics SMQV Super Miniature Wireless Microphone Transmitter

The Lectrosonics SMQV Super Miniature Wireless Microphone Transmitter incorporates Lectrosonics patented Digital Hybrid Wireless technology, in a package no bigger than a pager. The SMQV transmitter is miniature in size yet rugged enough to withstand rigorous daily use in the field or in studios.

To meet the demand for both extended operating range and extended battery life, the SMQV transmitters offer selectable output power of 50, 100 or 250 mW. A third selection at 50 mW is provided for some theatrical applications, where the system design specifies lower transmitter power. The SMQV transmitter offers 256 user-selectable UHF frequencies. The Switchcraft TA5M audio input has user-calibrated 44 dB gain range, and accepts electret lavaliere mics, dynamic mics, or line level signals. A DSP-controlled analog audio limiter is employed before the A-D converter. The limiter has a range of more than 30 dB and a dual-release envelope, making the limiter transparent while maintaining low distortion.

Lectrosonics patented Digital Hybrid technology revolutionizes wireless microphone transmission. Digital audio signal is converted and encoded for analog transmission, then decoded and converted back to digital audio at the receiver. The result is an exceptionally low noise floor as the compandor circuit is eliminated and clear audio reception is retained at greater distances.

The non-corrosive, machined aluminum casing is splash proof and features an LCD display with membrane switch control panel. The transmitter is powered by two AA lithium, NiMH or alkaline batteries for up to 14.5 hours (lithium). The SMQV transmitter is completely compatible with all Lectrosonics Digital Hybrid wireless receivers, as well as older Lectrosonics analog receivers.

• Selectable output power to optimize battery life or operating range: 50 mW, 100 mW, 250 mW
• Membrane switch control panel with LCD display
• 256 synthesized UHF frequencies
• Wide input dynamic range
• DSP based pilot-tone signal
• Circulator/Isolator output stage
• Splash-proof, machined aluminum housing
• Non-corrosive, super-hard finish

• Channel Spacing: Selectable, 25 or 100 kHz
• Frequency Selection: Control panel mounted membrane switches
• RF Power Output: Switchable, 50, 100, or 250 mW (not available for 941 Band)
• Compatibility Modes (6): Digital Hybrid Wireless® (400 Series), 200 Series, 100 Series, Mode 3 , Mode 6, IFB
• Pilot Tone: 25 to 32 kHz frequency (Digital Hybrid mode); 5 kHz deviation | 941 Band: 27 to 32 kHz frequency (Digital Hybrid mode); 3 kHz deviation
• Frequency Stability: ± 0.002%
• Deviation: ± 50 kHz (max., 400 Series only)
• Spurious Radiation: 60 dB below carrier
• Equivalent Input Noise: -125 dBV (A-weighted)
• Input Level:
  • If set for dynamic mic: 0.5 mV to 50 mV before limiting. Greater than 1 V with limiting.
  • If set for electret lavalier 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 50 V with limiting.
• Input Impedance:
  • Dynamic Mic: 300 Ohms
  • Electret Lavalier: Input is virtual ground with servo adjusted constant current bias
  • Line Level: 2.7 k Ohms
• Input Limiter: Soft limiter, 30 dB range
• Bias Voltages: Fixed 5 V at up to 5 mA. Selectable 2V or 4V servo bias for any electret lavalier.
• Gain Control Range: 44 dB; panel mounted membrane switches
• Modulation Indicators: Dual bi-color LEDs indicate modulation of -20, -10, 0, +10 dB referenced to full modulation
• Controls: Control panel with LCD and four membrane switches
• Low Frequency Roll-Off: Adjustable from 35 to 150 Hz
• Audio Frequency Response: 35 Hz to 20 kHz, ± 1 dB
• Signal to Noise Radio (dB; Overall System, 400 Series Mode):

  SmartNR	No Limiting	With Limiting
  OFF	103.5	108.0
  NORMAL	107	111.5
  FULL	108.5	113

  ^{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 4.5 dB of receiver output range, thus reducing the measured figure for SNR without limiting by 4.5 dB.}
• THD: 0.2% typical (400 Series only)
• Audio Input Jack: Switchcraft 5-pin locking (TA5F)
• Antenna: Flexible, unbreakable steel cable
• Battery: (2) 1.5 Volt AA Lithium
• Battery Life, (2) AA Lithiums:
  • SMQV 50mW: 14.5 hours
  • SMQV 100mW: 14 hours
  • SMQV 250mW: 7.5 hours; not applicable to 941 Band
• Emission Designator: 180KF3E
• Dimensions: 2.3 x 2.4 x .64 in | 58 x 60 x 16 mm, not including microphone
• Weight: 3.7 oz | 105 g, including lithium batteries