MPN #SMV-21    


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Single Battery - Digital Hybrid Wireless UHF Belt-Pack Transmitter

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.

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.

High Power Output and Long Battery Life
Variable power provides the choice of maximum power output for extended operating range and interference sup- pression, or lower power output for extended battery life when operating in less demanding RF conditions.

Adjustable Low Frequency Roll-off
The low frequency roll-off can be set for 3 dB down points at 35, 50, 70, 100, 120 or 150 Hz to control subsonic and very low frequency audio content.

Input Limiter
A DSP-controlled analog audio limiter is employed before the analog-to-digital converter. The limiter has a range of more than 30 dB for excellent overload protec- tion. A dual release envelope makes the limiter acousti- cally transparent while maintaining low distortion. The limiter recovers quickly from brief transients, so that its action is hidden from the listener, but recovers slowly from sustained high levels, to keep audio distortion low and preserve short term dynamic changes.
The bicolor LEDs indicate limiter activity accurately to assist in setting the input gain for optimal signal to noise ratio and dynamic range.

The transmitter RF output circuit includes a specialized RF device called a "circulator/isolator" or simply "isolator" using a magnetically polarized ferrite to allow RF signals to pass through to the antenna, but block them from coming backward into the transmitter output section. This greatly reduces RF intermodulation produced in the transmitter output stages when multiple units are used in close proximity (a few feet apart). The isolator also helps protect the output stage from electrostatic shock deliv- ered to the antenna. Isolators are common in broadcast and commercial applications, but because of their high cost it is unusual to find them in wireless microphone systems.

In special circumstances it is possible for moisture to be pulled into the housing when a unit is moved from
a warm, damp operating environment, turned off and stored in a cool place. As the warm air inside the unit cools a vacuum is created, pulling air in past the exte- rior of the housing, bringing moisture with it. A special vent in the battery door prevents a vacuum from being created by allowing air to pass but blocking the passage of water.

DSP-Based Pilot Tone & Compatibility
The DSP generated pilot tone eliminates the need for fragile crystals and allows a different pilot tone frequency for each of the 256 carrier frequencies in the tuning range of the wireless system. Individual pilot tones significantly reduce squelch problems in multichannel systems where a pilot tone signal can appear in the wrong receiver via intermodulation products.
The DSP also offers compatibility modes to allow back- ward compatibility with all Lectrosonics IFB systems, 100/200 Series systems and analog receivers from some other manufacturers in addition to its native Digital Hybrid operating mode.
  • Digital Hybrid Wireless? Technology*
  • Variable, selectable power output: SMV: 50mW, 100mW, 250mW
  • 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
  • Operating frequencies: Block 21: 537.600 - 563.175
    Channel Spacing: Selectable; 25 or 100 kHz
    Frequency selection: Control panel mounted membrane switches
    RF Power output: Switchable; 50, 100 or 250 mW
    Compatibility Modes (6): Digital Hybrid WirelessTM (400 Series), 200 Series, 100 Series, Mode 3 , Mode 6, IFB
    Pilot tone: 25 to 32 kHz; 5 kHz deviation (in 400 Series Mode)
    Frequency stability: ± 0.002%
    Deviation: ± 75 kHz max. (in 400 Series Mode)
    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 lavaliere mic: 17 mV to 1.7 V before limiting. Greater than 50 V 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 lavaliere: 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 2 V or 4 V servo bias for any electret lavaliere.
    Gain control range: 44 dB; panel mounted membrane switches
    Modulation indicators: Dual bicolor LEDs indicate modulation of -20, -10, 0, +10 dB referenced to full modulation.
    Controls: Control panel with LCD and four membrane switches.
    Total Harmonic Distortion: 0.2% typical (400 Series mode)
    Audio Input Jack: Switchcraft 5-pin locking (TA5F)
    Antenna: Flexible, unbreakable steel cable.
    Batteries: 1.5 Volt AA lithium

    Included Accessories
    1 - AA Lithium Battery
    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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