K275W CPI | Alldatasheet

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IOT Amplifier K2 UHF-TV Cavity Amplifier The EIMAC K275W Klystrode ® Inductive Output T ube (IOT) is a high efficiency amplifier tube for use in UHF television service in the output stages of vision, sound, combined vision and sound. The IOT has 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 cavity amplifier is comprised of a single tube, K275W , and associated hardware assembly, HA2000. The cavity amplifier covers the entire UHF TV band from 470—815 MHz (bands IV and V). The K2 amplifier series has an advanced Electro-Magnetic- Compatibility (EMC) designed input circuit, which isolates the RF input from the transmitter DC high voltage. The input circuit has a stable, out-of-the-way storage position and utilizes a cam- guided insertion mechanism to ensure positive connection to the IOT . The input cavity, the output cavity, focus magnet assembly, arc detector, water-jacket and load coupler are mounted on a rugged wheeled support stand.

  • 75 kW Peak of Sync in Vision only Service
  • 55 kW Peak of Sync, 5.5 kW single carrier sound in Common Amplification Service
  • Figure of Merit of 116% in Vision only; 114% in Common Amplification
  • High gain amplifier: 23 dB Channel 20
  • Long life, high reliability with dispenser type cathode and pyrolytic graphite grid
  • Single tube and circuit: 470 to 815 MHz
  • User-friendly tuning
  • T ube replacement does not require disconnection of power supply or cooling water
  • Compact size with “collector (water) down”
  • Water-cooled collector and output cavity; air-cooled circuits, anode and electron gun
  • U.S. Based, Worldwide product and applications support Electron gun and cavity air-cooling is improved with the new K2 air plenum design. T ube replacement and maintenance is a simple matter for one person without requiring winches or removing the cavity assembly from the transmitter cabinet. Coolant lines or power supplies do not have to be disconnected. The Klystrode ® IOT may be operated in combined sound and vision mode service at 55 kW peak-of-sync with suitable precorrection. This mode of operation results in extremely simple, compact, and economical transmitter design. The Klystrode ® IOT is also suitable for operation as an FM aural power amplifier. It may be operated in the FM mode at approximately 10% of the peak-of-sync power of a companion visual mode IOT with a common beam supply. In DTV digital transmission, the Klystrode ® IOT can be used at up to 110 kW peak power or greater depending on the peak-to-average level (for details please contact Eimac Division, CPI Inc., Klystrode ® IOT Applications Engineering). Made in USA

For More Detailed Information: Contact CPI / MPP Eimac Operation, IOT Applications Engineering

607 Hansen Way, Palo Alto, CA 94304 Phone: 650-592-1221, Fax: 650-592-9988

www.cpii.com or e-mail to: klystrode@cpii.com Characteristics and typical operating conditions are subject to change without notice. CPI, Eimac Division should be consulted before using this information for final equipment design. Klystrodeand Eimac are registered trademarks of CPI. Vacion is a registered trademark of Varian Associates, Inc. General Characteristics SUMMARY DATA Gain decreases approximately 0.6 dB per 100 MHz increase 30 to 38 kV* ELECTRICAL Focus Magnet (current regulated): 3.5 ±1.5V * Current must be limited by the supply MECHANICAL K275W Klystrode IOT HA2000 Hardware Assembly Output RF connector: Standard 3-1/8 inch, 50 Ohm coaxial line (Alternate 4-1/16 inch, 50 Ohm coaxial line available - user to specify). Cooling1 Arc Detector T wo (2) photo resistors and test lamps are located in the output cavities which must be used for protection of the tube from cavity arc damage. ION Pump A getter ion pump requiring 3-4 kV with respect to the heater is provided. Operational Characteristics Common Amplifier Service (Single Sound) Absolute Maximum Ratings: Combinations of absolute maximum rating can not be attained simultaneously. NOTE 1: The recommended coolant flow rate for pure demineralized water is 10 GPM. When using a 50/50 glycol/water mix, Eimac recommends the flow rate be set at 20 GPM. Regardless of the coolant mixture, should audible evidence of boiling be heard, which sounds like rattling, the coolant flow rate must be immediately increased or the equipment shut down. Annual replacement of the coolant, such as Dowtherm 4000 or Dowtherm SR-1, is recommended to avoid glycol breakdown.