Hitachi E-Compact Medium Power Series, Operation Manual, Page: 48 / 106

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E-Compact Medium Power
6.2. PA704MP / PA702MP Power Amplifier Module
This is an air-cooled UHF power amplifier drawer composed of an RF block with until four power transistors
that utilize Doherty's high efficiency technology. Each Drawer can provide up to 450 Watts RMS (ATSC
1.0) or up to 400 Watts RMS (ATSC 3.0) with efficiency between 34% and 41% depending on the operating
channel.
The Power Drawers are mounted in the 2U rack and avaliable em two models:
PA702MP Power Amplifier (MOD GV 40033A) – 215 Watts @ATSC3.0 / 225 Watts @ATSC1.0
PA704MP Power Amplifier (MOD GV 40010) – 400 Watts @ATSC3.0 / 450 Watts @ATSC1.0
Main features:
⇨ High efficiency.
⇨ Power Supply redundancy – avaliable on PA702MP model.
⇨ Doherty Configuration.
⇨ Standing fans accessible from the front panel.
⇨ Removable power supply at the front panel of the drawer.
⇨ 2U Power Drawer for 19" rack.
⇨ Power transistors LDMOS Ampleon BLF-888A.
⇨ 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. Risk of
equipment damage.