Lectrosonics HMa UHF Plug-On Wireless Transmitter, Frequency Band B1 (537.600-614.375MHz)

It's time to elevate your audio recording experience with the HMa UHF Plug-On Wireless Transmitter, Frequency Band B1 (537.600-614.375MHz). This innovative plug-on transmitter is designed to seamlessly pair with any microphone or line level source via a standard XLR connector. It offers selectable phantom power at 5, 15, and 48 volts, or the option to turn it off when using dynamic microphones and line level signal sources.

The HMa UHF Plug-On Wireless Transmitter stands out with its wide tuning range of up to 76 MHz, adjustable in increments of 100 kHz or 25 kHz, offering up to 3072 frequencies. This tuning range encompasses three standard 25.6 MHz Lectrosonics frequency bands, each featuring 256 different pilot tone frequencies for optimal compatibility with all Digital Hybrid Wireless receivers.

This transmitter is also equipped with DSP compatibility modes, ensuring it works seamlessly with legacy Lectrosonics analog wireless microphone receivers, IFB receivers, and even some receivers from other manufacturers. Powering this device is as simple as using two AA batteries, with a multi-color LED indicating the status.

The HMa UHF Plug-On Wireless Transmitter is designed with user convenience in mind, featuring a USB port for firmware updates and an IR (infrared) port to simplify setup with IR-enabled receivers. The input amplifier employs an ultra-low noise op-amp for quiet operation and is gain-controlled with a wide-range dual envelope limiter, providing over 30 dB of headroom above full modulation.

The audio signal is digitized by a 24-bit A-D converter, then filtered to remove supersonic noise above 21 kHz. The resulting signal is encoded with a proprietary algorithm to produce an analog data signal for RF transmission. The RF link is an optimized FM system with +/-75 kHz wide deviation, ensuring a high signal-to-noise ratio.

The antenna, formed between the machined aluminum housing of the transmitter and the attached microphone or cable, 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 input coupler's conical-shaped collar, made of DuPont Delrin, enhances the ERP of the antenna in the uppermost frequency bands.

The HMa UHF Plug-On Wireless Transmitter utilizes Digital Hybrid Wireless technology, a revolutionary design that combines digital audio with an analog FM radio link to deliver outstanding audio quality and the exemplary RF performance of the finest analog wireless systems. This design overcomes channel noise in a dramatically new way, digitally encoding the audio in the transmitter and decoding it in the receiver, yet still sending the encoded information via an analog FM wireless link.

The battery compartment door is hinged to the housing and remains attached to the transmitter when opened. It securely latches in place and applies pressure to the batteries when closed. The two AA batteries are connected in series through a conductive plate on the door. Setup and adjustments are made with the control panel membrane switches and LCD. The transmitter can be powered up without the transmitter output enabled to allow frequency adjustments without causing interference to other wireless systems nearby. The switches can also be bypassed to prevent accidental changes. Dual color LEDs indicate audio input level and the power LED changes color under low battery conditions.