Lectrosonics SSM Super Slight Micro Body Pack Transmitter

The Lectrosonics SSM is a Digital Hybrid Wireless® miniature belt-pack transmitter that is ideal in theater or any other production where concealment in costuming is required. Despite its tiny size, the transmitter offers an extensive feature set (and performance) on par with all of the Digital Hybrid Wireless® models.

Digital Hybrid Wireless™ is a 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. Digital Hybrid Wireless™ overcomes channel noise in a dramatic 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 existing analog wireless systems.

Frequencies are selectable in 100 kHz or 25 kHz steps across a maximum tuning range of 76.7 MHz, which yields a total of 3,072 available frequencies across three standard frequency blocks. The servo bias input accepts mic or line level signals with a wide range of gain adjustment in 1 dB steps. The limiter in the preamp can cleanly handle signal peaks over 30 dB above full modulation, allowing the input gain to be set high enough to achieve the maximum signal to noise ratio, yet provide protection against input overload. Accurate LED indications on the keypad allow precise gain adjustments to be made for the maximum signal-to-noise ratio and minimum distortion.

Compatibility with earlier analog Lectrosonics receivers, Lectrosonics IFB receivers and some receivers from other manufacturers is provided by DSP emulation modes selected in the LCD menu.

Lectrosonics SSM Features:

• Tunable across three standard frequency blocks (76.8 MHz)
• Digital Hybrid Wireless® audio for compandor-free digital quality
• Selectable 25 or 50 mW RF power
• Compatibility modes for use with analog receivers
• 25 or 100 kHz tuning steps for up to 3,072 selectable frequencies
• Wide range input gain control in 1 dB steps
• Quick change Lithium-ion rechargeable battery
• Audio coupled remote control

Lectrosonics SSM Specifications:

• Operating Frequencies:
  • Block A1: 470.100 - 537.575
  • Block B1: 537.600 - 614.375
  • Block C1: 614.400 - 691.175
  • Block D1: 691.200 - 767.975 (export only)
• Frequency Selection Steps: Selectable; 100 kHz or 25 kHz
• RF Power output: Selectable; 25 or 50 mW
• Pilot tone: 25 to 32 kHz; 5 kHz deviation (Digital Hybrid mode)
• Frequency Stability: ± 0.002%
• Deviation: ± 75 kHz max. (Digital Hybrid mode)
• Spurious radiation: 60 dB below carrier
• Equivalent input noise: –120 dBV (A-weighted)
• Input level:
  • Nominal 2 mV to 300 mV, before limiting
  • Greater than 1V maximum, with limiting
• Input impedance:
  • Mic: 300 or 4.5 k ohm; selectable
  • Line: greater than 100 kOhm
• Input limiter: DSP controlled, dual envelope “soft” limiter with greater than 30 dB range
• Gain control range: 44 dB; digital control
• Modulation indicators: Dual bi-color LEDs indicate modulation of -20, -10,0 and +10 dB referenced to full modulation
• Audio Performance (Digital Hybrid Mode)
  • Frequency Response: 70 Hz to 20 kHz (+/-1dB)
  • Low frequency roll-off: –12 dB/octave; 70 Hz
  • THD: 0.2% (typical)
  • SNR at Receiver Output:
    • OFF: 103.5 (no limiting); 108.0 (w/ limiting)
    • NORMAL: 107.0 (no limiting); 111.5 (w/ limiting)
    • FULL: 108.5 (no limiting); 113.0 (w/ limiting)
  • Controls: Side panel membrane switches with LCD interface for power on/off and all setup and configuration controls
  • Audio Input Jack: LEMO 00 Series 3-pin
  • Antenna: Galvanized steel, flexible wire
  • Battery: Lithium-ion 3.7 V 800 mAH DLF40 battery pack
  • Battery Life: 4 hours per charge
  • Weight: 2.3 oz. (65.2 g) including lithium battery pack
  • Dimensions (housing): 2.3" x 1.5" x .56" (58.4 x 38 x 14.2 mm)
  • Emission Designator: 180KF3E