The HM Digital UHF Wireless Plug-On Microphone Transmitter from Lectrosonics enables you to transmit the signal of any XLR microphone wirelessly. The HM transmitter overcomes inherent channel noise with its patented Digital Hybrid Wireless technology, which digitally encodes the audio. Digital conversion before transmission provides all of the benefits of conventional FM wireless systems, (range, resistance to interference, etc) without the noisy artifacts introduced by analog compandors.
The HM transmitter provides 256 user-selectable UHF frequencies. The input amplifier uses an ultra low noise op-amp for quiet operation. Gain controlled with a wide range dual envelope limiter, it provides over 30 dB of headroom above full modulation. A 24-bit A-D converter digitizes the audio, then filters supersonic noise above 21 kHz.
HM transmitters are backwards compatible with Lectrosonics 100, 200, and IFB series receivers; as well as being compatible with third-party analog receivers. Phantom power from its XLR input jack is selectable between 5, 18 and 48 volts, making the HM compatible with just about any condenser or dynamic microphone. It's powered by two AA lithium, NiMH, or alkaline batteries for up to 12.75 hours of use, with Phantom Power engaged (lithium).
The sound quality of the HM transmitter is outstanding. The power supply provides constant voltages, switching to accommodate the life-cycle of the batteries, resulting in an ultra low noise input amplifier. The excellent signal to noise ratio and dynamic range of the HM qualify it for use in the most demanding of professional applications.
- Wideband Design
- The HM transmitter uses ±75 kHz wide deviation for an excellent signal to noise ratio and wide dynamic range.
- Digital Hybrid Wireless Technology
- Audio is encoded in the transmitter and decoded in the receiver, overcoming channel noise, yet still sending the encoded information via an analog FM wireless link.
- Low Frequency Roll-Off
- The low frequency roll-off can be set for a 3 dB down point at 35, 50 or 70 Hz to control low frequency rumble and ambient noise in the audio.
- Input Limiter
- A DSP-controlled limiter is employed before the analog-to-digital converter. The limiter has a range of more than 30 dB for excellent overload protection. A dual release envelope makes the limiter acoustically transparent while maintaining low distortion.
- Battery Powered
- The HM transmitter is powered by two AA batteries, yet still maintains long battery life, even with 48V Phantom Power engaged; up to 12.75 hours with Lithium batteries.