AUDIO WIRELESS – DA224-MB

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.