The High Power Amplifier
(HPA) includes an IOT, available from different suppliers. The
uniquely linear and stable characteristics of the IOT eliminate the
need of a sophisticated correction circuit. The IOT HPAs operate
over the entire UHF bands and provide unsurpassed efficiency. Itelco
has developed high quality cavities, which are approved by all IOT
tube manufacturers, for improved gain and bandwidth. The complete
IOT assembly is easily removed from the transmitter on its wheeled
carriage when service is required. No routine adjustment of the
cavity is necessary and only minor adjustment is required when the
tube is replaced. The advanced control system provides for a soft
start, ramp up of the RF drive to the IOT on start-up. For
protection of the tube grid, HV and RF are interlocked so that a
loss of the HV disables the RF
drive. |