DATA S H E E T HIGH POWER TRAVELING WAVE TUBE FOR GROUND TERMINALS LD7202 SERIES 14 GHz, 600 W CW, PPM FOCUSING, HIGH POWER GAIN GENERAL DESCRIPTION NEC LD7202 series of PPM-focused traveling wave tubes are designed for use as final amplifiers tube in the earth-to-satellite communications transmitter. These are capable of delivering an output power of 600W over the range of 12.75 to 14.5 GHz and provide a high power gain of 52 dB at 600 W output power. Furthermore, they are of rugged and reliable design offering long-life service. The LD7202 is fully compatible with TH3591B. FEATURES ™ High Power Gain The power gain is typically 52 dB at 600 W level. ™ Simple Cooling System The tubes are forced-air-cooled, so that the cooling systems are greatly simplified. ™ PPM Focusing All the tubes are PPM (Periodic Permanent Magnet)-focused, eliminating entirely the focusing power supplies and interlock circuits. ™ Rugged Construction The tubes are designed to be rugged, therefore they are suitable for transportable systems. ™ Long Life and High Stability The tubes employ an advanced impregnated cathode with a low operating temperature for long life. ™ Microdischarge Free The tubes are carefully designed to be free from microdischarge in the electron gun for long term operation, therefore they are suitable for use in digital communication service. 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. ET0141EJ2V1DS00 (2nd edition) Date Published August 1998 M Printed in Japan © 1989(1995) LD7202 SERIES GENERAL CHARACTERISTICS ELECTRICAL Frequency LD7202, LD7202A, LD7202B ............................................. 14.0 to 14.5 GHz LD7202L ............................................................................. 13.75 to 14.5 GHz LD7202W ............................................................................ 12.75 to 13.25 GHz, 13.75 to 14.5 GHz Output Power ............................................................................ 600 W Heater Voltage ........................................................................... 6.3 V Heater Current ........................................................................... 1.4 A Type of Cathode ........................................................................ Indirectly heated, Impregnated Cathode Warm-up Time ........................................................... 300 s MECHANICAL Dimensions ................................................................................ See Outline Weight ........................................................................................ 6.0 kg approx. Focusing .................................................................................... Periodic Permanent Magnet Mounting Position .................................................................... Any Electrical Connections .............................................................. See Outline Drawing RF Connections Input ................................................................................... SMA-Female Output ................................................................................ Mates with UBR-120 Flange Thermal Switch Connections ................................................... See Outline Drawing Cooling ....................................................................................... Forced Air 2 LD7202 SERIES ABSOLUTE RATINGS (Note 2, 3 and 4) ELECTRICAL Min. Max. Unit Heater Voltage .................................................................. 5.5 6.5 V Heater Surge Current ...................................................... – 4.5 A Heater Current .................................................................. – 3 A Heater Warm-up Time ..................................................... 300 – s Collector Voltage∗ ............................................................ Collector Current .............................................................. 4.75 – 6.2 425 kV mA Helix Voltage .................................................................... 10.25 10.75 kV Helix Current .................................................................... – 12 mA Anode Voltage .................................................................. 5.5 6.5 kV Anode Current .................................................................. – 0.5 mA Collector Dissipation ....................................................... – 2.4 kW RF Drive Power ................................................................ – 20 mW Output Power ................................................................... – 670 W Load VSWR∗∗ ................................................................... – 1.15:1 ∗ The voltage between a helix and a collector must not exceed 8 kV. ∗∗ Load VSWR must be met as follows. In Band .......................................................... 1.15 : 1 max. 13.5 to 15.0 GHz ............................................ 1.5 : 1 max. (LD7202, LD7202A, LD7202B) 13.25 to 15.0 GHz .......................................... 1.5 : 1 max. (LD7202L) 12.25 to 15.0 GHz .......................................... 1.5 : 1 max. (LD7202W) 15.0 to 16.0 GHz ............................................ 1.8 : 1 max. 16.0 to 17.0 GHz ............................................ 2.2 : 1 max. MECHANICAL Min. Max. Unit Air Flow of Collector ........................................................ 252 – kg/hr Ambient Temperature (Operation) ................................. –10 +50 ˚C Storage Temperature ....................................................... –40 +80 ˚C 3 LD7202 SERIES TYPICAL OPERATION (Note 4 and 5) Unit Frequency LD7202/A/B .......................................................... 14.0 to14.5 GHz LD7202L ............................................................... 13.75 to14.5 GHz LD7202W ............................................................. 12.75 to13.25, 13.75 to14.5 GHz Output Power ............................................................... 600 W Heater Voltage (Note 5) .................................................. 6.3 V Heater Current ............................................................. 1.4 A Helix Voltage ................................................................ 10.5 kV Helix Current ................................................................ 3 mA Collector Voltage ......................................................... 5.4 kV Collector Current ......................................................... 360 mA Anode Voltage ............................................................. 5.9 kV Anode Current ............................................................. 0.1 mA Power Gain at 70 W ................................................................. 58 dB at 600 W ............................................................... 52 dB LD7202/A/B .......................................................... 2 dB/500MHz LD7202L ............................................................... 2.4 dB/750MHz LD7202W (12.75 to 13.25 GHz) ......................... 2 dB/500MHz (13.75 to 14.5 GHz) ........................... 2.4 dB/750MHz Gain Slope ................................................................... 0.01 dB/MHz 1.5 deg./dB Gain Variation (at Po=70 W) AM-PM Conversion at 70 W ................................................................. at 600 W ............................................................... 3rd Order Intermodulation ......................................... 5 deg./dB -28 dBc Cooling Air Flow .......................................................... 252 kg/hr Pressure Drop .............................................................. 588 Pa (two equal carriers, 70 W total) 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. Note 2 : The tube helix is at the ground potential in operation. Note 3 : All voltages except heater voltage are referred to the cathode potential except the heater voltage. Note 4 : The optimum operating parameters are shown on a test performance sheet for each tube. Note 5 : These characteristics and operating 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. 4 LD7202 SERIES LD7202, LD7202L, LD7202W OUTLINE DRAWING (Unit in mm) 85 MAX. 72 450 + – 70 TERMINALS FOR M3 RF INPUT 157 TYPE SMA FEMALE 101 166 170 MAX. AIR INLET 101 4-M4 10- φ 6 19 6 101 MATES WITH UBR-120 FLANGE 175 RF OUTPUT 110 MAX. 111 55 4-M3 86 66 100 87 MAX. 127 MAX. φ 83 AIR OUTLET Note. The thermal switch contacts are normally closed. 5 LD7202 SERIES LD7202A OUTLINE DRAWING (Unit in mm) AMP-861610-4 85 MAX. 72 450 + – 70 CONNECTORS RF INPUT 157 TYPE SMA FEMALE 101 166 170 MAX. AIR INLET 101 4-M4 10- φ 6 19 6 101 MATES WITH UBR-120 FLANGE 175 RF OUTPUT 110 MAX. 111 55 4-M3 86 66 100 87 MAX. 127 MAX. φ 83 AIR OUTLET Note. The thermal switch contacts are normally closed. 6 LD7202 SERIES LD7202B OUTLINE DRAWING (Unit in mm) 600 + – 70 AMP861647-8 MULTI CONNECTOR 72 85 MAX. RF INPUT 157 TYPE SMA FEMALE 101 166 170 MAX. AIR INLET 101 4-M4 10- φ 6 19 6 101 MATES WITH UBR-120 FLANGE 175 RF OUTPUT 110 MAX. 111 127 MAX. 86 66 100 87 MAX. 55 PIN CONNECTION A HK 6 HEL φ TEMP-2 83 AIR OUTLET H 7 2 5 4 4-M3 1 3 COL TEMP-1 AMP861647-8 CONNECTION Note. The thermal switch contacts are normally closed. 7 LD7202 SERIES 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.