DATA S H E E T HIGH POWER CW KLYSTRONAMPLIFIER FOR GROUND TERMINALS LD4606A 30 GHz, 380 W CW, HIGH EFFICIENCY, HIGH POWER GAIN GENERAL DESCRIPTION The NEC LD4606A is a five-cavity Klystron amplifier and ideal for use in the earth-to-satellite communications transmitter. This is designed for operating at 380 W CW power levels in the frequency range of 27.50 to 29.10 GHz. The instantaneous bandwidth of minus one-decibel is at least 70 MHz over the entire 1.6 GHz range. The tube is forced-air-cooled at the 380 W operation. Furthermore, this is of rugged and reliable design offering long-life service. FEATURES 1 High Efficiency The DC to RF conversion efficiency is typically 23 % by incorporating a 39 % depressed collector. 2 High Power Gain The power gain is typically 40 dB at the 380 W level, so the driving power is less than 50 mW. 3 Simple Cooling System The klystron is all forced air cooled with only one blower, so that the cooling systems are greatly simplified. 4 Permanent Magnet The klystron is permanent magnet focused, eliminating entirely the requirement for focusing power supplied and interlock circuits. 5 Rugged Construction The klystron is designed to be rugged. For safe use of microwave tubes, refer to NEC document “Safety instructions to all personnel handling electron tubes” (ET0048EJ∗V∗UM00) The information in this document is subject to change without notice. Document No. ET0117EJ3V1DS00 (3rd edition) Date Published August 1998 M Printed in Japan © 1989 LD4606A GENERAL CHARACTERISTICS ELECTRICAL Frequency ……………………………………………… 27.50 to 29.10 GHz Output Power ………………………………………… 380 W Heater Voltage ………………………………………… 4.3 V Heater Current ………………………………………… 2.5 A Type of Cathode ……………………………………… Indirectly Heated, Impregnated MECHANICAL Dimensions …………………………………………… See Outline Focusing ……………………………………………… Permanent Magnet Electrical Connections Heater ……………………………………………… AMP (861647-8) Receptacle Heater-Cathode …………………………………… AMP (861647-8) Receptacle Body, Collector …………………………………… AMP (861647-8) Receptacle RF Connections Input ………………………………………………… Mates with FUBR-260 Output ……………………………………………… Mates with FUBR-260 Mounting Position …………………………………… Vertical (Cathode down) Weight ………………………………………………… 45 kg approx. Cooling Gun ………………………………………………… Forced Air Collector …………………………………………… Forced Air Body ………………………………………………… Forced Air Cavity Tuning Method ……………………………… Hand Tuning ABSOLUTE RATINGS ( Note 1, 2 and 3 ) ELECTRICAL Min. Heater Voltage ………………………………………… Heater Surge Current ……………………………… Max. Unit 3.5 5.5 V – 5.5 A Heater Warm-up Time ……………………………… 300 – s Body Voltage ………………………………………… – 9.5 kV Collector Voltage ……………………………………… – 9.0 kV Beam Current ………………………………………… – 400 mA Body Current ………………………………………… – 20 mA Collector Current ……………………………………… – 400 mA DC Input Power ……………………………………… – 2.5 kW Load VSWR Normal Value ……………………………………… – 1.2 Instantaneous Value ……………………………… – 1.5 MECHANICAL Collector Temperature ……………………………… – 200 °C Cooling Air Temperature …………………………… –10 45 °C Air Flow for Collector Body and Gun …………… 238 – kg/hr Operating …………………………………………… –10 45 °C Storage ……………………………………………… –40 70 °C Ambient Temperature 2 LD4606A TYPICAL OPERATION (Note 3, 4 and 5) Unit Frequency ……………………………………………………… 28.5 GHz Heater Voltage (Note 4) ……………………………………… 4.3 V Heater Current ………………………………………………… 2.5 A Body Voltage …………………………………………………… 8.5 kV Body Current …………………………………………………… 10 mA Collector Voltage ……………………………………………… 5.2 kV Collector Current ……………………………………………… 300 mA DC Input Power 1.65 kW Driving Power ………………………………………………… 44 mW Output Power ………………………………………………… 380 W Power Gain …………………………………………………… 40 dB Band Width (-1 dB) …………………………………………… 80 MHz Air Flow of Collector, Body and Gun ……………………… 250 kg/hr ……………………………………………… Note 1 : Absolute rating should not be exceeded under continuous or transient conditions. A single absolute rating may be the limitation and simultaneous operation at more than one absolute rating may not be possible. Equipment design should limit voltage and environmental variations so that ratings will be exceeded. Note 2 : The Klystron body should be at ground potential in operation. Note 3 : All voltages are referred to the cathode potential except the heater voltage. Note 4 : The optimum operating value is shown on a test performance sheet for each tube. Note 5 : Characteristics and operating values on this Data Sheet are based on performance test. These values may be changed as a result of additional information or product improvement. NEC should be consulted before using this information for equipment design. This data sheet should not be referred to a contractual specification. No part of this document may be copied in any form or by any means without the prior written consent of NEC Corporation. NEC Corporation does not assume any liability for infringement of patents, copyrights or other intellectual property rights of third parties by or arising from use of a device described herein or any other liability arising from use of such device. No license, either express, implied or otherwise, is granted under any patents, copyrights or other intellectual property rights of NEC Corporation or of others. 3 LD4606A LD4606A OUTLINE (Unit in mm) TOP VIEW BOTTOM VIEW 270 MAX. 152 4 - φ12 148 ± 1.5 370 MAX. 6 85 105 291.6 ± 1.5 87.4 Heater Cathode 42.5 90 122 Heater Ground 6 2 5 3 Body 5th Cavity 3rd Cavity φ 132 ± 1.5 Air Outlet Receptacle PIN Connection SIDE VIEW 344 270 MAX. 21.2 15.5 82.1 238.5 Collector AMP (861647-8) Air Inlet 100 1st Cavity 4 108.5 Electrical Connection AMP (861647-8) 1 4th Cavity RF Output (MATES WITH FUBR-260) 2nd Cavity RF INput (MATES WITH FUBR-260)