Audio Wireless Diversity Antenna Distribution Module without dc distribution (DADM228)

The Diversity antenna distribution module DADM228 is a custom design, which offers the solution to antenna distribution requirements for portable sound bag and sound trolley applications. Designed for where the weight and size matters without sacrificing on performance. The DADM228 is a 2x IN and 2×8 OUT active antenna distribution system with in-built band-pass filtering: the DADM228 eliminates multiple receiver antennas and provides a tidy sound bag solution with improved RF performance. There are two industry standard BNC input connectors for antenna inputs which enables use of standard low loss RF extension cables and there 2×8 mini-RF SMA connectors feeding the diversity receivers.

The DADM228 has a very high input signal handling capacity with very low noise figure and offers an outstanding inter-modulation performance when compared to other low power devices available. The system box offers +6dB to -10dB gain user adjustable in 1dB steps to suit individual applications. The user adjustable gain offers flexibility optimizing system RF gain budget to suit, Digital, Hybrid and Analogue receivers are available in our industry.

In applications when remote antenna powering is needed, the DADM offers switchable MHA powering with RED LEDs indicating power ON/OFF status, the MHA powering can be turned ON/OFF through the OLED display menu. The antenna inputs compromise a very low loss very selective band-pass filter designs to reject unwanted frequencies below and above the tuning bandwidth.

The DADM is externally powered between 10-18Vdc, the dc input connector is an industry standard 4-pin Hirose, a green LED indicates power-on status of the system box and the OLED display continuously displays dc input voltage.

FEATURES:

• one pair of antenna feeds up to eight diversity receivers
• built-in band-pass filtering and signal splitters
• user adjustable gain
• remote antenna powering
• industry standard connectors
• intuitive OLED display menu and LED indicators
• single power source solution
• master ON-OFF switch
• continuous system volts monitoring
• soft ON/OFF switch for each individual remote antenna powering
• CNC machined aluminum custom design, lightweight and rugged, fits neatly in any sound bag or sits in the cart

RF DISTRIBUTION SECTION:

• frequency range: 470 to 1164 MHz (in bands)
• input impedance: 50 Ohm
• output impedance: 50 Ohm
• gain (each output): +6 dB to -10dB, user adjustable
• current consumption: 135mA
• bandwidth: pre-programmed band, specify at order
• OIP3: greater than +41dBm
• port to port isolation: greater than 20dB (min.)
• noise figure: lesser than 3 dB

CONNECTIONS:

• RF inputs: 2 x 50 Ohm standard BNC sockets
• RF outputs to receivers: 2x 4x 50 Ohm mini UHF SMA sockets
• main ON/OFF switch: master switch

POWERING:

• external power: 10 up to 18V dc
• remote antenna powering: switchable dc T-bias powering, 12Vdc @ 200mA max, regulated for active antenna powering, short circuit protected

OUTER CASE:

• dimensions (W x H x D in mm): 192 x 42 x 64
• weight: 465g