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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:
| Band1:470-608MHz | Band9:510-608MHz | 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 Filter | User-selectable 32-band pass filters |
| Gain | +6dB to -10dB in 1dB steps, adjustable |
| OIP3 | >+41dBm |
| System Noise Figure | <3.5dB (2.5dB nom.) |
| Port-to-port isolation | >20dB |
| Input/Output Impedance | 50Ω |
| Operating Temperature | -20 to +55°C |
| RF Connectors | |
| RF INPUT | 50Ω industry standard BNC socket |
| RF OUTPUT | 50Ω mini SMA |
| User Interface | |
| Display | Intuitive menu OLED (white on black) |
| User Control Buttons | Tactile switches: UP, DOWN, SET (SET doubles as ON/OFF) |
| LED 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 |
| HRS 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) |
| Case | |
| Dimensions | 72 x 68 x 19 mm (W x H x D) |
| Weight | 120g |
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 is powered by a 10–18 Vdc supply source via standard 4-pin connectors and features two HRS-compatible 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.
Audio Wireless Ltd reserves the right to modify specifications without prior notice as part of its ongoing product development policy.