Tokyo Hy-Power HL-550FX User Manual page 16

Solid-state hf/50mhz band 550w linear power amplifier

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10-4

Control Board (PC1818)

This is the heart of the control signal processing for the HL-550FX. It judges the

operating condition of the amplifier, as well as issuing the commands to the

peripheral circuits. Various analog signals are processed such as RF drive from the

transceiver, RF power signals at various points, DC power supply information, etc.

There are ope-amps, various three terminal voltage regulators, GAL logic device

etc. Warning signals are processed by the logic IC for Over Heat, Over Voltage, Pr,

Band Miss-set etc. Ope-amps produce the necessary DC signals to drive the Pf, Pr

meters. Also there is a control circuit that issues the drive shut down command in

case of the over drive, band miss-set and high antenna SWR conditions.