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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:
| Band1:470-08MHz | 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 |
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| 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 |
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| RF Connectors |
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| RF Inputs |
2 x 50 Ω standard BNC sockets |
| RF Outputs |
2 x 4 x 50 Ω mini-UHF SMA sockets |
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| User Interface |
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| Display |
Intuitive menu OLED (white on black) |
| User Control Buttons |
Tactile switches: UP, DOWN, SET (SET doubles as ON/OFF) |
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| Monitoring and Indicators |
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| Received Signal Strength (RSSI) |
Green LED (signal strength above -40dBm (100uV) |
| Active Antenna Powering (AAP) |
Yellow LED |
| Signal Overload (OL) |
Red LED |
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| Powering |
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| 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) |
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| Outer Case |
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| 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.
Audio Wireless Ltd reserves the right to modify specifications without prior notice as part of its ongoing product development policy.