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Features
The EIMAC K2 Digital family of Klystrode® Inductive Output Tubes (IOTs) are high efficiency amplifier tubes for use in digital UHF television service in the output stage of DTV transmitters. The tubes are suitable for use with 8VSB and COFDM modulation schemes. The IOTs have a magnetically focused electron beam which is density bunched by an RF cavity driven grid. With moderate amplitude and phase precorrection the tube can be operated in class AB mode with very low average beam current thus saving beam power which would otherwise be wasted as heat in the collector. The K2 IOTs are optimized to maintain high gain and linearity at the average or rms signal levels as well as at the peak power levels. Efficiency is optimized at the average or rms level for low operating cost.
The cavity amplifier, CDK2xxxW series, is comprised of a single digital rated IOT, K2DxxxW series, and associated hardware assembly, HA600A. The cavity amplifier covers the entire UHF TV band from 470 to 860 MHz (bands IV and V).
The hardware assembly is designed with a number of features to enhance the performance of the IOT as well as providing ease in amplifier tuning and maintenance. The assembly consists of the input cavity, the output cavity, focus magnet assembly, arc detector, water jacket, load coupler and a rugged wheeled support stand. Tube installation and replacement is user friendly and is simple to accomplish without disconnecting coolant lines or power supplies. Tuning of a replacement IOT requires only a brief “touch up” or minor fine tuning prior to use. Simple controls are provided for front access tuning with only a minimal amount of test equipment.
The electron gun and cavities are forced air cooled with user supplied filtered air. The IOT collector is water cooled.
In digital transmission the K2 family of IOTs can be used at peak output powers from 44 kW to over 110 kW with corresponding average power levels from 11 kW to 28 kW. (For further details please contact Eimac Division, CPI, Inc., Klystrode IOT Applications Engineering.)
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K2 Series Digital IOT Operating Parameters
| Maximum Ratings | K2D40W | K2D60W | K2D75W | K2D110W | (units) | |
|---|---|---|---|---|---|---|
| Heater Starting Current | 15 | 15 | 15 | 15 | A | |
| Beam Voltage | 30 | 33 | 34 | 36 | kV | |
| Collector Dissipation | 40 | 40 | 50 | 50 | kW | |
| Load VSWR | 1.5:1 | 1.5:1 | 1.5:1 | 1.5:1 | - | |
| Envelope temperature | 110 | 110 | 110 | 110 | deg C | |
| Peak Drive Power | 1200 | 1200 | 1200 | 1200 | W | |
| Average Drive Power | 300 | 300 | 300 | 300 | W | |
| Grid Bias Voltage | -200 | -200 | -200 | -200 | V | |
| Grid Current | +/- 200 | +/- 200 | +/- 200 | +/- 200 | mA | |
| Peak Output Power | 50 | 70 | 85 | 115 | kW | |
| Average Output Power | 15 | 20 | 25 | 35 | kW | |
| Typical Ratings | K2D40W | K2D60W | K2D75W | K2D110W | (units) | |
|---|---|---|---|---|---|---|
| Peak Output Power | 44 | 64 | 80 | 110 | kW | |
| Average Output Power | 11 | 16 | 20 | 28 | kW | |
| Load VSWR | 1.1:1 | 1.1:1 | 1.1:1 | 1.1:1 | - | |
| Beam Voltage | 27 | 30 | 33 | 34 | kV | |
| Beam Current | 1.2 | 1.4 | 1.6 | 2.2 | A | |
| Collector Dissipation | 22 | 26 | 34 | 47 | kW | |
| Bias Voltage | -50 | -55 | -60 | -65 | V | |
| Beam Idle Current | 0.25 | 0.3 | 0.4 | 0.5 | A | |
| Peak Input Power | 300 | 475 | 600 | 800 | W | |
| Average Input Power | 69 | 101 | 126 | 174 | W | |
Characteristics and Operating values are based on performance tests.
Figures may change without notice as the result of additional data or product refinement.
CPI Eimac Division should be consulted before using this information for final equipment
design.
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Last page update 06/04/98
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