Pa708Hp - Power Amplifier Module (Mod Gv 40272 / Mod Gv 40276 ) - Hitachi E-Compact High Power Series Operation Manual

3.2. PA708HP - Power Amplifier Module (MOD GV 40272 / MOD GV 40276 )

This is an air-cooled UHF power amplifier drawer composed of an RF block with eight (8) power transistors
that utilize Doherty's high efficiency technology. Each Drawer can provide up to 1100 Watts RMS (ATSC
1.0) or up to 930 Watts RMS (ATSC 3.0) with efficiency between 34% and 41%, depending on the
operating channel.
The Power Drawers are mounted in the rack by a quick release system that allows them to be connected
to the Racks without the need to plug cables or connectors into the rear.
Main features:
High efficiency
Power Supply redundancy - 2 Power Supplies
Doherty Configuration
Standing fans accessible from the front panel
Removable power supply at the front panel of the drawer
3U Power Drawer for 19" rack
Broadband power amplifiers
Power transistors LDMOS Ampleon BLF-888E
Automatic control of the quiescent currents of the power transistors depending on the
temperature
Automatic fan speed control according to power transistor's temperature
Protection against VSWR and Overdrive
Power Factor Corrector (PFC) at power supply (PFC)
Protection against over current in the power supply
Settings and measures via terminal
Automatic restart after alarm event
Matched sample of the output signal
Integrated MOD bus Control
Never unplug any Power Amplifier Drawer while the Transmitter is on due to the
risk of damaging the equipment.
E-Compact HP-BB3 Series
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