Inductive Output Tube

The Inductive Output Tube (IOT) is an electron tube for amplifying radio frequency signals in the UHF frequency bands and L. IOT the intensity of a cathode beam, as in the tetrode, a grid is modulated. The modulated electron beam generates energy by a static high-voltage field between the grid and a tubular accelerating electrode (anode), focused magnetically and then passed through a cavity in which its density modulation is used as in a high-frequency power to the klystron. Then he meets a collector (collector).

The RF power is removed by electro-magnetic coupling to a waveguide ( coaxial or waveguide ) as in the klystron of the cavity resonator. The tubular anode also prevents feedback of the radio frequency in the grid - anode space.

IOT is called Klystrode since they can be considered as a combination of the klystron and triode. There efficiencies were up to 75 % measured.

The upper limit frequency is determined as the pitch of the grating by Scheibentrioden of the cathode; it is only about 0.1 mm in order to ensure that the electrons have passed through the grid before the modulation voltage changes polarity. Therefore, the maximum operating frequency is now at 1500 MHz.

IOTs are mainly and increasingly used in strong terrestrial television channels, even in particle accelerators of high energy physics. They have largely up to about 100 kW displaces the klystron power range. The advantages over the klystron are 10-20% higher efficiency, the relatively small size and, with them, the lower by about 30%. A particular disadvantage is the low gain of only about 22-25 dB. ( Klystrons typically achieve gains of > 40 dB. ) In the still higher powers and frequencies, the klystron is still unrivaled.

Credentials

• Electron tube
• Wireless technology