The Advantech AMT MMDS Modular Broadband Transmitting System consists of two main elements, an Indoor Up-Converter/ Amplifier (ADVMU-030) and an Outdoor Booster Amplifier (AWMA-S). The AWMA-S series of Booster Amplifiers is available in output power of 100, 150 and 200 Watts. The broadband system is transparent to the type of modulation or encoding scheme. The Indoor Up-Converter/ Amplifier is designed for 19" Rack-mount and the Outdoor Booster Amplifier is designed for masthead installation close to the antenna. The system can carry up to 31 channel, analog or digital high quality channels.

MAIN FEATURES

• Input band 220-420 MHz (138-338 MHz optional)
• Full broadband capability 2.5 to 2.7 GHz S-Band (2.5 - 2.7 GHz)
• Transparent to modulation or encoding scheme
• Automatic Level Control (ALC) for the complete system
• All system parameters are controlled from the indoor unit
• Local monitoring and control via LCD display panel
• Remote monitor and control via RS-485 interface
• Accepts external or internal 10 MHz reference
• Weatherproof packaging for booster

System Description The system consists of two main elements: a 19" rack-mounted Up-Converter and Amplifier unit and a masthead mounted Booster Amplifier unit. The Booster Amplifier is available in powers 100, 150 and 200W. Up to 20 dB of cable loss may be accommodated in the coaxial cable connecting the Up-Converter to the booster amplifier. The Up-Converter converts the VHF signals in 222 - 408 MHz (or optionally 138 - 324 MHz) band to the S-Band (2.5– 2.7 GHz). The signal is then amplified for delivery to the outdoor masthead booster unit. With a conversion gain of 37 dB in the Indoor Up-Converter amplifier unit, up to 20 dB of attenuation may be accommodated in the coaxial cable connecting the indoor and the masthead units. The total system conversion can be adjusted, locally from the front panel or remotely via the serial interface, from 55 dB to 75 dB. An Automatic Level Control (ALC) system provided by the controllers of both the Up-Converter and the Amplifier, will (if activated) keep the output power at a constant level, regardless of the loss variations in the transmission line, the temperature changes and other factors. A serial communication link is established between the Up-Converter and the Masthead unit. The complete system is monitored and controlled via the indoor unit front panel or remotely through the RS485 interface. The control functions include output power adjustment, automatic level control (ALC) and RF ON/OFF (mute/un-mute). The system is phase locked to the station 10 MHz reference, in the case of absence or failure of the reference signal, the system will revert automatically to an internal reference.

System Description

Output Power, Watt	Output Power @ P1dB
50 W	+ 46 dBm, Min.
100 W	+ 49 dBm, Min.
200 W	+ 52 dBm, Min.