SMTX
Lectrosonics
SMTX
Lectrosonics Super Mini Transmitter
This miniature transmitter brings Digital Hybrid Wireless™ technology to essentially any wireless lavaliere or headset microphone application. Its tiny size makes concealment easy, while setup and control is simplified with membrane switches and an LCD interface. Isolated output reduces IM (intermodulation), allowing for a greater number of channels in operation.
The splash-proof housing is machined out of a single block of aluminum, which is then plated with a super-hard, non-corrosive coating. The SM transmitter is equally at home in theatre, on tour, and in television and film production where temperature and environmental extremes require superior performance under the most demanding conditions.
The splash-proof housing is machined out of a single block of aluminum, which is then plated with a super-hard, non-corrosive coating. The SM transmitter is equally at home in theatre, on tour, and in television and film production where temperature and environmental extremes require superior performance under the most demanding conditions.
Product Weight: 2.7 oz
Dimensions: 2.3"W x 1.8"H x 0.64"D (not including microphone)
Technical Tools
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Manufacturer Specs
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
Frequency Range: 256 frequencies in 100kHz steps for each 25.5MHz wide block
Channel Spacing: 100 kHz
RF Power output: 100mW (nominal)
Compatibility Modes (6): 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 lavaliere: 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: 300Ω
Electret Lavaliere: Virtual ground with servo-adjusted constant voltage bias
Line Level: 2.7kΩ
Bias Voltages
Fixed 5V at up to 5mA (pin 2)
Selectable 2V or 4V (pin 3) for any electret lavaliere microphone 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 20 kHz +/- 1 dB.
Line Input: 32 Hz to 20 kHz +/- 1 dB
Signal to Noise Ratio (dB) (Overall System 400 Series Mode):
SmartNR No Limiting w/Limiting
OFF 103.5 108.0
NORMAL 107.0 111.5
FULL 108.5 113.0
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: 1.5 hours (alkaline); 5.5 hours (lithium), 4.5 hours with 2500mAh NiMH
Emission Designator: 180KF3E
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
Frequency Range: 256 frequencies in 100kHz steps for each 25.5MHz wide block
Channel Spacing: 100 kHz
RF Power output: 100mW (nominal)
Compatibility Modes (6): 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 lavaliere: 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: 300Ω
Electret Lavaliere: Virtual ground with servo-adjusted constant voltage bias
Line Level: 2.7kΩ
Bias Voltages
Fixed 5V at up to 5mA (pin 2)
Selectable 2V or 4V (pin 3) for any electret lavaliere microphone 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 20 kHz +/- 1 dB.
Line Input: 32 Hz to 20 kHz +/- 1 dB
Signal to Noise Ratio (dB) (Overall System 400 Series Mode):
SmartNR No Limiting w/Limiting
OFF 103.5 108.0
NORMAL 107.0 111.5
FULL 108.5 113.0
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: 1.5 hours (alkaline); 5.5 hours (lithium), 4.5 hours with 2500mAh NiMH
Emission Designator: 180KF3E