Inductive Output Tube
(IOT)

  

  

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.


 


IOT Transmitters Sub-units Estimated  working life vs MTBF

Section Sub-Units Expected Life
H.V. Level Filament Focus >10 years
Grid PS/ION Pump >10 years
Ins. Transformer >10 years
Final Amplifier IOT Tube >3,5 years
Input Cavity >10 years
Cooling Funs & Pumps >5 years

 

   

IOT TRANSMITTER MAINTENANCE PROGRAM
Checking of the electrical parameters every 6 months
Checking of the heat exchanger every 6 months
Checking of the air filter every 3 months
Cleaning of the liquid circuit filter every 6 months
Replacement of the cooling liquid every 2 years
Cleaning of the high voltage housing every year
Checking of the ball-bearing of the blower every 2 years
Checking of the ball-bearing of the pumps every 2 years
Replacing of the mechanical seal of the pumps every 6 years

   
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