User's Manual

III-3
Inside each 500-watt power amplifier, the signal passes through an RF attenuator to limit the output
power level of the power amplifier, to help buffer any transients that may come into the power
amplifier, and most importantly, allow for provisions to balance the gain of the TAU-500 to the other
TAU-500. After attenuation, the signal gets preamplified through a TECH–30U driver amplifier
before the signal gets split into (2) signals for final amplification using a 2-way Wilkinson microstrip
power divider. The final amplification stage is comprised of (2) P300-UHF final amplifiers. The
outputs of the (2) final amplifier pallets are combined with a 2-way Wilkinson microstrip combiner
and pass through an isolator and dual directional coupler for protection and monitoring purposes,
as illustrated in the following TAU-500 block diagram.