N PRODUCTION SOON DA224-MB Digitally Tuned True Diversity Antenna Distribution System Overview The DA224-MB is an advanced, digitally tuned active antenna distribution system designed to enhance wireless microphone performance. It offers user-selectable band-pass filtering across a broad frequency range of 470-832MHz. This selective filtering ensures out-of-band rejection, thereby shielding connected receivers from unwanted or “dirty” RF signals. Antenna inputs are industry standard BNC connectors, supporting low-loss RF extension cables, while outputs are 2 x 4 mini-RF SMA connectors, optimally serving diversity receivers. Key Features User-selectable Multi-Band Digitally Tuned Band-Pass Filtered Design: The system offers flexibility with a choice of pre-programmed bands tailored for different applications and geographic locations. Lightweight Construction: The DA224-MB boasts a compact and lightweight CNC machined aluminium chassis, making it ideal for use in portable sound bag setups. True Antenna Diversity: Supports 4-way true diversity antenna operation, ensuring robust RF signal integrity. Advanced RF Filtering: Covers the 470–832MHz spectrum with advanced filtering to protect signal quality. Gain Control: System gain is user-adjustable in 1dB increments between 6dB and -10dB, with 0dB set as unity gain. Active Antenna Powering (AAP): User-switchable powering for remote antennas, with yellow LED indicators denoting ON/OFF status via the OLED display menu. Monitoring and Indicators Features Include: User Interface: Navigation and adjustments are through tactile switches (UP, DOWN, SET), with the SET button doubling as the ON/OFF switch. Active Antenna Powering YELLOW LED Received Signal Strength Indicator (RSSI), Green LED Signal overload (OL) RED LED Continuous system voltage monitoring via OLED display menu setting Pre-Programmed Frequency Bands The DA224-MB offers a wide selection of pre-programmed frequency bands, covering 470–832MHz the available bands are as follows: Band1:470-08MHz Band99:510-608MHz Band17:550-608MHz Band25:570-614MHz Band2:470-638MHz Band10:510-638MHz Band18:550-638MHz Band26: 570-638MHz Band3:470-663MHz Band11:510-663MHz Band19:550-663MHz Band27: 570-663MHz Band4:470-700MHz Band12:510-700MHz Band20:550-700MHz Band28: 570-694MHz Band5:470-714MHz Band13:510-714MHz Band21:550-714MHz Band29: 570-700MHz Band6:470-810MHz Band14:510-810MHz Band22:550-810Mz Band30: 570-714MHz Band7:470-832MHz Band15:510-832MHz Band23:550-832MHz Band31: 570-810MHz Band8:470-614MHz Band16:510-614MHz Band24:550-614MHz Band32: 570-832MHz Panels and Connectors Antenna A Outputs Antenna B Outputs DC IN/OUT Rear Panel Technical Specifications RF Distribution Section Frequency Range 470 to 832MHz (digitally tuned) Available UHF Band-Pass Filters User-selectable 32 band-pass filters Input Impedance 50 Ω Output Impedance 50 Ω Gain User adjustable 6dB to -10dB Current Consumption 180 mA at 12.0 Vdc OIP3 > 41 dBm Port to Port Isolation > 20 dB (min.) System Noise Figure < 2 dB RF Connectors RF Inputs 2 x 50 Ω standard BNC sockets RF Outputs 2 x 4 x 50 Ω mini-UHF SMA sockets User Interface Display Intuitive menu OLED (white on black) User Control Buttons Tactile switches: UP, DOWN, SET (SET doubles as ON/OFF) Monitoring and Indicators Received Signal Strength (RSSI) Green LED (signal strength above -40dBm (100uV) Active Antenna Powering (AAP) Yellow LED Signal Overload (OL) Red LED Powering Active Antenna Powering (AAP) Switchable dc T-bias powering, regulated 12Vdc@250mA max. short circuit protected Hirose DC IN/OUT HR1 and HR2 Unregulated incoming volts, wired in parallel, protected against reverse polarity DC Connectors Wiring DC IN Pinouts: Pin1 2(-ve), Pin3 4( ve) DC OUT Pinouts: Pin1 2(-ve), Pin3 4 ( ve) Outer Case Dimensions 72 x 68 x 19 mm (W x H x D) Weight 120 g Application and Compatibility The DA224-MB demonstrates extremely high input signal handling with an exceptionally low noise figure, delivering outstanding intermodulation performance compared to other low power devices. It is fully compatible with digital, hybrid, and analogue radio microphone receivers commonly used in the industry. The unit powered by a 10–18 Vdc supply source via standard 4-pin connectors and features two Hirose DC IN/OUT to power another auxiliary equipment. Use Cases Audio Wireless digitally tuned narrow-band and semi-broadband systems have become the preferred choice for freelance sound engineers, equipment rental companies, and major broadcasters, supporting a wide range of wireless microphone applications.
