FM Transmitter
Sistemas Electrónicos S.A EM 250 COMPACT DIG
Technical Manual - v1.1 - February 2006 30
2.5 R.F. Power Amplifier module.
This stage is designed with only one high gain BLF-278 MOSFET RF power transistor capsule, in a
broadband class AB
1
common emitter design, with +48V
DC
supply :
Fig. 2-3: 300W FM POWER AMPLIFIER MODULE.
RF Power module includes a driver stage and an output amplifier stage. Figure 2-3 above shows the
general arrangement of this power amplifier module. Numbered elements are as follows:
1 - Cooling fan directed towards heat sink's cooling fins.
2 - Output low pass filter and directional coupler.
3 - RF output Power amplifier section.
4 - RF driver section.
5 - PS-500/48 Main Power supply.
6 - BLF-278 MOSFET output power amplifier twin-transistors capsule.
7 - RF output connector.
8 - RF monitor output.
9 - RF Exciter Unit.
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