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

General Characteristics
Operational Characteristics
SUMMARY DATA
Frequency Range................................................. 470 to 815 MHz
Peak-of-sync output power (at IOT flange) ........................75 kW
Power Gain ......................................................23 dB @ 500 MHz
Gain decreases approximately 0.6 dB per 100 MHz increase
Beam Voltage ........................................................... 30 to 38 kV*
ELECTRICAL
Cathode ..................................................................Dispenser type
DC Heater Voltage .........................................................8 to 10 V
DC Heater Current ................................................ 8.5 A (typical)
Heater Power................................................... 80 Watts (nominal)
Maximum cold start DC Heater Current ............................. 15A*
Heater warm-up time .....................................5 minutes (nominal)
Focus Magnet (current regulated):
DC Voltage ..........................................................3.5 ±1.5V
DC Current .......................................................... 15—25A
* Current must be limited by the supply
Common Amplifier Service (Single Sound)
• Visual output power (peak-of-sync) ............................ 55 kW
• Aural output power ................................................... 5.5 kW
• Peak instantaneous RF output power ......................... 95 kW
• Heater requirements ..................................................... 80 W
• Beam voltage ............................................................... 33 kV
• Beam current (peak-of-sync) (vision content only) .........3.3 A
• Beam current (black level)..............................................2.8 A
• Beam current (gray level) ...............................................1.6 A
• Grid current (max) ......................................................±0.2 A
• Quiescent beam current ..............................................0.40 A
• Grid bias voltage with respect to cathode voltage .......... -65 V
• Drive power (visual peak-of-sync) ............................... 450 W
• Drive power (aural) ...................................................... 46 W
• Figure of merit ..............................................................114%
• Collector Dissipation (Max)........................................ 60 kW
MECHANICAL
K275W Klystrode IOT
Length .................................. (overall) 22.5 in ( 57.2 cm) nominal
Diameter ................................. (overall) 5.1 in (12.9 cm) nominal
Mounting position .............................vertical, collector end down
Net weight (with lift handle) ................ 25.0 lbs ( 11.4 kg) approx.
HA2000 Hardware Assembly
Input ........................................ ....... RF connector, 7/16” type N
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).
Net weight of total hardware assembly ................ 460 lbs [209 kg]
Cooling¹
Airflow to cavities and cathode ............... 50 - 70 cfm (2.0m³/min)
Static pressure head ............................. 5.0 inches water (1.30 kPa)
Inlet air temperature ..................................................... 15—50°C
Water flow for collector: ......... 10 - 20 US g/min (38 -75 1/min)
Collector pressure drop at 15 US gal/min............. 15 psi (104 kPa)
Maximum Inlet pressure ...................................... 60 psi (414 kPa)
Water Outlet temperature .............................................70°C max
Water Inlet temperature .............................................. 15°—55°C
Arc Detector
Two (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.
Absolute Maximum Ratings: Combinations of absolute maximum
rating can not be attained simultaneously.
Heater Current.......................................................................10 A
Heater Voltage....................................................................... 10 V
Beam Voltage ...................................................................... 38 kV
Beam Current ..........................................................................5 A
Quiescent Current.............................................................0.700 A
Collector Dissipation ......................................................... 60 kW
Drive Power (Peak)............................................................ 1.5 kW
Drive Power (Average)........................................................ 300 W
Grid Voltage....................................................................... -200 V
Grid Current .....................................................................0.300 A
Peak Power Out................................................................ 130 kW
Average/CW Power Out..................................................... 60 kW
VSWR .................................................................................. 3.0:1
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.
ION Pump
A getter ion pump requiring 3-4 kV with respect to the heater is
provided.
For More Detailed Information: Contact CPI / MPP Eimac Operation, IOT Applications Engineering
607 Hansen Way, Palo Alto, CA 94304 Phone: [phone], Fax: [phone]
www.cpii.com or e-mail to: [e-mail]
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.