The DHu handheld transmitter delivers superb audio quality and extended operating range in a pure digital architecture. Interchangeable microphone capsules expand the versatility to suit a wide variety of applications and personal preferences. The superb audio performance and highly reliable RF transmission makes it ideally suited for high end stage and studio production.
The transmitter tunes continuously from 470.100 to 607.975 MHz in 25 kHz steps, making it easy to find clear operating frequencies. Operating frequency is normally selected using a receiver or analyzer to assess signals in the local environment to avoid interference. Once an interference-free frequency is identified, the transmitter frequency is set to match the receiver.
Input Gain Range and Limiter
45 dB range of input gain adjustment allows gain settings to accurately match the user’s voice and the varying sensitivity of different microphone capsules. 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. A dual release envelope makes the limiter acoustically transparent while maintaining low distortion. It can be thought of as two limiters in series, a fast attack and release limiter followed by a slow attack and release limiter. 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.
Long Battery Life
Switching power supplies throughout the design allow over 5 hours of operation using two alkaline AA batteries. The battery compartment and contacts are designed to prevent “rattle” as the unit is handled.
A high-resolution LCD and control panel with membrane switches provide access to the menu-driven setup. Transmitter RF power, low frequency rolloff, frequency selection, backlight timeout settings and programmable switch functions are easily accessed.
A newly designed helical antenna allows the transmitter to be held in any position, since the user’s hands have little or no effect on the RF output power.
The transmitter is available from Lectrosonics with the HHC cardioid condenser capsule. Capsules from several other manufacturers with a 1.25” x 28 thread pitch and three contact rings are also available for use with the transmitter. Condenser or dynamic microphone heads can be used with the transmitter, depending on the user’s preference or the application.
Side Button Functions
A programmable switch on the side of the housing can be configured as a mute/cough switch, a power switch, or be disabled.
USB Port for Firmware Updates
Firmware updates are enabled by simply downloading a file and utility program from the Lectrosonics web site, connecting the transmitter to a computer via the USB port and running the program.