K275W Datasheet, PDF (1/2 Pages) Communications & Power Industries, Inc. – K2 UHF-TV Cavity Amplifier

K275W
K2 Series
IOT Amplifier
• 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
• Tube 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
The EIMAC K275W Klystrode^® Inductive Output Tube (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.
April 2007
K2 UHF-TV Cavity Amplifier
Made in USA
Electron gun and cavity air-cooling is improved with the new K2
air plenum design. Tube 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).