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DIGITALLY TUNED - EXTENDED FREQUENCY RANGE 470-1260MHz
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 470-1260MHz. 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 for 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 470–1260MHz spectrum with advanced filtering to protect signal quality.
- Gain Control: System gain is user-adjustable in 1dB increments between +6dB* and -21dB, with 0dB set as unity gain.
- Active Antenna Powering (AAP): User-switchable powering for remote antennas, with orange (red and green lit) 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 Orange (both Red and Green lit) LED
- Received Signal Strength Indicator (RSSI), Green LED
- 50dB RSSI gauge metering - RSSI Bars for A and B antennas
- Signal overload (OL) RED LED
- Continuous system dc voltage monitoring via OLED display menu setting
Pre-Programmed Frequency Bands
The DA224-MB offers a wide selection of pre-programmed frequency bands, covering 470–1260MHz. There are 3-Modles available as follows.
MODEL 1: DA224-MB GLOBAL "PRE-PROGRAMMED FREQUENCY BAND TABLE":
| Band1:470-608MHz | Band8:510-663MHz | Band15:520-714MHz | Band22:570-663MHz |
| Band2:470-638MHz | Band9:510-700MHz | Band16:550-608MHz | Band23:570-700MHz |
| Band3:470-663MHz | Band10:510-714MHz | Band17:550-638MHz | Band24:570-714MHz |
| Band4:470-700MHz | Band11:520-608MHz | Band18:550-663MHz | Band25:806-810MHz |
| Band5:470-714MHz | Band12:520-638MHz | Band19:550-700MHz | Band26:823-832MHz |
| Band6:510-608MHz | Band13:520-663MHz | Band20:550-714MHz | Band27:940-960MHz |
| Band7:510-638MHz | Band14:520-694MHz | Band21:570-608MHz | Band28:960-992MHz |
MODEL 2: DA224-MB UK/DME "PRE-PROGRAMMED FREQUENCY BAND TABLE":
Band1:470-608MHz
Band8:510-663MHz
Band15:520-714MHz
Band22:570-663MHz
Band2:470-638MHz
Band9:510-700MHz
Band16:550-608MHz
Band23:570-700MHz
Band3:470-663MHz
Band10:510-714MHz
Band17:550-638MHz
Band24:570-714MHz
Band4:470-700MHz
Band11:520-608MHz
Band18:550-663MHz
Band25:823-832MHz
Band5:470-714MHz
Band12:520-638MHz
Band19:550-700MHz
Band26:960-992MHz
Band6:510-608MHz
Band13:520-663MHz
Band20:550-714MHz
Band27:1045-1075M
Band7:510-638MHz
Band14:520-694MHz
Band21:570-608MHz
Band28:1105-1154M
MODEL 3: DA224-MB JAPAN "PRE-PROGRAMMED FREQUENCY BAND TABLE":
Band1:470-608MHz
Band8:510-663MHz
Band15:520-714MHz
Band22:570-663MHz
Band2:470-638MHz
Band9:510-700MHz
Band16:550-608MHz
Band23:570-700MHz
Band3:470-663MHz
Band10:510-714MHz
Band17:550-638MHz
Band24:570-714MHz
Band4:470-700MHz
Band11:520-608MHz
Band18:550-663MHz
Band25:806-810MHz
Band5:470-714MHz
Band12:520-638MHz
Band19:550-700MHz
Band26:1240-1260M
Band6:510-608MHz
Band13:520-663MHz
Band20:550-714MHz
Band27:WB-1260M
Band7:510-638MHz
Band14:520-694MHz
Band21:570-608MHz
Band28:NO FILTER
Panels and Connectors
Antenna A Outputs
Antenna A - RF IN Antenna B - RF IN
Antenna B Outputs
DC IN/OUT Rear Panel
Technical Specifications
| RF Distribution Section | |
| Frequency Range | 470 to 1260MHz (Digitally Tuned) |
| Available UHF Band-Pass Filters | User-selectable 28 band-pass filters |
| Gain | +6dB* to -21dB in 1dB steps, adjustable (* band dependent) |
| OIP3 | >+41dBm |
| System Noise Figure | <3.5dB (2.5dB nom.) |
| Port-to-port isolation | >25dB |
| Input/Output Impedance | 50Ω |
| Operating Temperature | -20 to +55°C |
| RF Connectors | |
| RF INPUT | 2 x 50Ω industry standard BNC socket |
| RF OUTPUT | 8 x 50Ω mini SMA |
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| User Interface | |
| Display | Intuitive menu OLED (white on black) |
| User Control Buttons | Tactile switches: UP, DOWN, SET (SET doubles as ON/OFF) |
| Measurements | |
| DC Voltmeter | 10-18V (+/-0.25V) |
| RSSI Gauge Meter | 50dB RSSI gauge metering, OLED display continuously Antenna A and B signal strength |
| LED Indicators | |
| Received Signal Strength (RSSI) | Green LED (signal strength above -50dBm - +/-5dB) |
| Active Antenna Powering (AAP) | Orange (Red and Green Leds lit) LED |
| Signal Overload (OL) | Red LED (signal strength above -5dBm - +/-5dB) (this level is 10dB below the LNA limiting level) |
| 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) |
| DC IN Voltage range | 10-18V dc |
| Current consumption | 180mA +/-10% |
| 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 full 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 other 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.