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18
SECTION 5.0
PRINCIPLES OF OPERATION
5.1 PROPER USAGE AND WARNINGS
5.1.1 Controlling Power Output
With a nominal 50 ohm resistive load and an input signal appropriate to produce a power output
within the limitations specified above, the amplifier may be placed in operation. To interrupt the
output, simply interrupt the input signal. The amplifier may be run indefinitely at rated output.
Output power is usually measured with a power meter and suitable power Termination.
5.1.2 Input Signal Levels
The Amplifier is designed to operate with less than a 0 dBm (1.0 mW) input signal. It is not
advisable to over drive any amplifier and depend on protection circuits to maintain proper gain
control. IFI makes available with each shipped amplifier specific data and curves so the operator will
know the proper input signal levels to more efficiently operate the amplifier, refer to Paragraph 4.7
herein.
5.2
Features
5.2.1 Preamplifier
The Preamplifier provides the proper drive levels to the TWT to obtain the proper Output Power.
The preamplifier is powered from a low voltage power supply that is independent of the main power
supply.
5.2.2 Power Amplifier
The Power amplifier consists of TWT as the main amplification stage. It is powered by several
power supplies; Filament supply, Helix supply and Collector supply.
