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Lectrosonics SMQV-20 Mini Transmitter, Variable Power, Block 20

  • Dale #:

    LECT-SMQV20
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Description

To meet the demand for both extended operating range and extended battery life, the "V" series SM transmitters offer selectable output power (See specific model data sheets for details). A third selection at 50 mW is provided for some theatrical applications where the system design specifies lowe... Read More

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Description

To meet the demand for both extended operating range and extended battery life, the "V" series SM transmitters offer selectable output power (See specific model data sheets for details). A third selection at 50 mW is provided for some theatrical applications where the system design specifies lower transmitter power.

Features:

  • Digital Hybrid Wireless™ Technology*
    (U.S. Patent #7,225,135)
  • Variable, selectable power output:
         SMQV: 50mW, 100mW, 250mW (for US units, blocks 470-26)
         SMQV: 50mW, 100mW (for US untis, block 941)
  • 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

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 before the A-D converter. 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 audible side effects, and also recovers slowly from sustained high levels to keep audio distortion low while preserving short term dynamics.

*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.

Included Accessories:

  • 2 - AA Lithium Batteries
  • 1 - Foam Insulating Pads (Part #35923)
  • 1 - Pouch (Part #35697)
  • 1 - Mic Connector Kit (Part #SMKITTA5)
  • 1 - Belt Clip (Part #SMBCUPSL)
  • 1 - Quick Start Guide

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Product Specs

Operating FrequenciesBlock 470: 470.100-495.600
Block 19: 486.400-511.900
Block 20: 512.000-537.500
Block 21: 537.600-563.100
Block 22: 563-200-588.700
Block 23: 588.800-614-300
Block 24: 614-400-639.900
Block 25: 640-000-665-500
Block 26: 665.600-691.100
Channel SpacingSelectable; 25 or 100 kHz
Frequency selectionControl panel mounted membrane switches
RF Power outputSwitchable; 50, 100 or 250 mW
Compatibility Modes (6)Digital Hybrid Wireless™ (400 Series), 200 Series, 100 Series, Mode 3 , Mode 6, IFB
Pilot tone25 to 32 kHz; 5 kHz deviation (in 400 Series Mode)
Frequency stability± 0.002%
Deviation± 75 kHz max. (in 400 Series Mode)
Spurious radiation60 dB below carrier
Equivalent input noise-125 dBV, A-weighted
Input level
     If set for dynamic mic0.5 mV to 50 mV before limiting. Greater than 1 V with limiting.
     If set for electret lavaliere mic1.7 uA to 170 uA before limiting. Greater than 5000 uA (5 mA) with limiting.
     Line level input17 mV to 1.7 V before limiting. Greater than 50 V with limiting.
Input impedance
     Dynamic mic300 Ohms
     Electret lavaliereInput is virtual ground with servo adjusted constant current bias
     Line level2.7 k ohms
Input limiterSoft limiter, 30 dB range
Bias voltagesFixed 5 V at up to 5 mA Selectable 2 V or 4 V servo bias for any electret lavaliere
Gain control range44 dB; panel mounted membrane switches
Modulation indicatorsDual bicolor LEDs indicate modulation of -20, -10, 0, +10 dB referenced to full modulation
ControlsControl panel with LCD and four membrane switches
Low frequency roll-offAdjustable from 35 to 150 Hz
Audio Frequency ResponseAdjustable from 35 to 150 Hz
Signal to Noise Ratio (dB):
(overall system, 400 Series mode)
SmartNRno limitingw/limiting
OFF103.5108.0
NORMAL107.0111.5
FULL108.5113.0
(Note: the dual envelope "soft" limiter provides exceptionally good handling of transients using variable attack and release time constants. The gradual onset of limiting in the design begins below full modulation, which reduces the measured figure for SNR without limiting by 4.5 dB)
Total Harmonic Distortion0.2% typical (400 Series mode)
Audio Input JackSwitchcraft 5-pin locking (TA5F)
AntennaFlexible, unbreakable steel cable
Batteries1.5 Volt AA lithium
Battery Life w/ Lithium AASMQV 50 mW (2 AA): 14.5 hrs
SMQV 100 mW (2 AA): 14 hrs
SMQV 250 mW (2 AA): 7.5 hrs
Weight (w/ litium batteries)3.7 oz. (105 grams)
Overall Dimensions
(without microphone)
2.3 x 2.4 x 0.64 inches
58 x 60 x 16 mm
Emission Designator180KF3E

Specifications subject to change without notice

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