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Lectrosonics, Inc. - HMa-941
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HMa-941

Series: Wireless microphones
Model: HMa-941
  • Accepts microphone or line level signals
  • Selectable 5, 15, 48 volt phantom power
  • Selectable 50/100 mW output power
  • Adjustable low frequency roll-off
  • Powered by two AA batteries
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This unique plug-on transmitter design will ideally match any microphone or line level source via a standard XLR connector. Phantom power is selectable at 5, 15 and 48 volts, or can be turned off for use with dynamic microphones and line level signal sources.

The antenna is formed between the machined aluminum housing of the transmitter and the attached microphone or cable. It functions as a dipole radiator when attached to a hand-held microphone and somewhat like a ground plane antenna when connected with a cable or plugged directly into a mixer. The conical shaped collar on the input coupler is made of DuPontTM Delrin® to improve the ERP of the antenna.

The transmitter is powered by two AA batteries, with status indicated by a multi-color LED. A USB port is provided for firmware updates. An IR (infrared) port is also included to simplify setup with IR enabled receivers.

The input amplifier uses an ultra low noise op-amp for quiet operation. It is gain controlled with a wide range dual envelope limiter, providing over 30 dB of headroom to prevent overload distortion and to maximize the signal to noise ratio. A 24-bit A-D converter digitizes the audio, then filters supersonic noise above 21 kHz.  The resulting signal is encoded with a proprietary algorithm to produce an analog data signal for RF transmission.  The underlying RF link is an optimized FM system with +/-50 kHz deviation for a high signal to noise ratio.

The audio performance of the overall hybrid system is depicted in the graph below. Distortion in the overall system is extremely low over the entire audio bandwidth

  • Accepts microphone or line level signals
  • Selectable 5, 15, 48 volt phantom power
  • Selectable 50/100 mW output power
  • Adjustable low frequency roll-off
  • Powered by two AA batteries
  • USB port for firmware updates
  • IR (infrared) port for fast setup
  • Solid machined aluminum housing
  • Compatibility mode for use with Lectrosonics IFB receivers

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