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DATA S H E E T
HIGH POWER TRAVELING WAVE TUBE FOR COMMUNICATIONS
LD7261
20 GHz, 250 W CW, PPM FOCUSING, HIGH POWER GAIN
GENERAL DESCRIPTION
The NEC LD7261 is a PPM-focused traveling wave tube designed for use as final amplifier in the earth-tosatellite communications transmitter. This is capable of delivering an output power of 250 W over the range of 18.0 to 21.7 GHz and provides a power gain of more than 40 dB at 250 W. Furthermore, it is rugged and reliable design offers long-life service.
FEATURES
TM High Power Gain The power gain is typically 40 dB at 250 W level. TM Simple Cooling System All the tubes are forced-air-cooled, so that the cooling systems are greatly simplified. TM PPM Focusing The tube is PPM (Periodic Permanent Magnet) -focused, eliminating entirely the focusing power supplies and interlock circuits. TM Rugged Construction The tube is designed to be rugged, therefore it is suitable for transportable systems. TM Long Life and High Stability The tube employs an advanced impregnated cathode with a low operating temperature for long life. TM Microdischarge Free The tube is carefully designed to be free from microdischarge in the electron gun for long term operation, therefore it is suitable for digital communication service.
For safe use of microwave tubes, refer to NEC document "Safety instructions to all personnel handling electron tubes" (ET0048EJVUM00)
The information in this document is subject to change without notice.
Document No. ET0397EJ1V0DS00 Date Published August 1998 M Printed in Japan
(c)
1998
LD7261
GENERAL CHARACTERISTICS
ELECTRICAL Frequency ...................................................... 18.0 to 21.7 GHz Output Power ................................................ 250 W Heater Voltage ................................................ 6.3 V Heater Current ................................................ 1.42 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 .................................... Flying Leads RF Connections Input ......................................................... SMA Female Output ...................................................... Mates with WR-51 waveguide (see outline) Cooling ......................................................... Forced Air
ABSOLUTE RATINGS (Note 1, 2 and 3 )
ELECTRICAL Heater Voltage ............................................. Heater Surge Current ................................. Heater Current ............................................. Heater Warm-up Time ................................. Helix Voltage ............................................. Helix Current ............................................. Anode Voltage ............................................. Anode Current ............................................. Collector Voltage .......................................... Collector Current .......................................... Cathode Current .......................................... RF Drive Power .......................................... RF Output Power ....................................... Load VSWR ................................................ ENVIRONMENTAL Temperature at output Flange ........................ Air Flow ...................................................... Ambient Temperature Storage ................................................... Operation ................................................ Min. -40 195 -40 -10 Max. +110 - +80 +50 Unit C kg/hour C C Min. 6.0 - - 300 9.5 - 8.0 - 4.0 - - - - - Max. 6.6 2.5 1.8 - 10.8 15.0 10.25 0.5 5.8 350 350 25 400 1.2 : 1 Unit V A A s kV mA kV mA kV mA mA mW W -
2
LD7261
TYPICAL OPERATION (Note 2, 3, 4 and 5)
Unit Frequency ................................................... Output Power ............................................. Heater Voltage (Note 4) ................................. Heater Current ............................................. Helix Voltage ............................................. Helix Current ............................................. Anode Voltage ............................................. Anode Current ............................................. Collector Voltage .......................................... Collector Current .......................................... Cathode Current .......................................... Power Gain Gain Variation Gain Slope at 25 W ........................... at 250 W ........................... at 25 W ........................... at 25 W ........................... at 25 W ........................... at 250 W ........................... 3rd Order Intermodulation ........................... (two equal carries, 25 W total) 20.0 250 6.3 1.42 10.6 0.7 8.6 0.01 5.0 264 265 49 46 5 0.012 1.5 6.0 -30 GHz W V A kV mA kV mA kV mA mA dB dB dB dB/MHz deg./dB deg./dB dBc
AM-PM Conversion
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 body is at ground potential in operation. Note 3 : All voltages 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.
3
4
6-32 UNC-2B Threaded Holes 8 Pics. 23
165.1 1.5
127 Air Inlet
25.4
98.5 87 0.5
50.8 0.2
LD7261 OUTLINE (Unit in mm)
19.8 0.5
11.4
76.2 0.5
152 0.5 505 MAX. (500 TYP.) Cover Plate 174 1 25.24
24.28
Air Inlet Interface 179 2
M3-4 Holes
Air Output with Slit
6
Lead Connections
Color Brown Yellow Blue Red Black White
76.2
6.4
5.6
31.80.5
RF Output WR-51 Waveguide 6-32 UNC-2B Thru 4 Pics. RF Input SMA Female
y t r e w q
900 50
99 1
83 0.5
10
12.62
(110)
33
83 0.5
87.5 MAX. 19 101 0.5
(75.5 TYP.)
55 2
12.14
33
108 MAX.
(For screw part)
101 0.5
101 0.5
157 0.5
8-32 UNC-2B Threaded Holes 10 Pics.
91 0.5
LD7261
Lead No. 1 2 3 4 5 6
Element Heater Heater-Cathode Anode Collector Helix (GROUND) Thermal Protection (Normal Close)
LD7261
5
LD7261
No part of this document may be copied or reproduced in any form or by any means without the prior written consent of NEC Corporation. NEC Corporation assumes no responsibility for any errors which may appear in this document. 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 others. While NEC Corporation has been making continuous effort to enhance the reliability of its electronic components, the possibility of defects cannot be eliminated entirely. To minimize risks of damage or injury to persons or property arising from a defect in an NEC electronic component, customers must incorporate sufficient safety measures in its design, such as redundancy, fire-containment, and anti-failure features. NEC devices are classified into the following three quality grades: "Standard", "Special", and "Specific". The Specific quality grade applies only to devices developed based on a customer designated "quality assurance program" for a specific application. The recommended applications of a device depend on its quality grade, as indicated below. Customers must check the quality grade of each device before using it in a particular application. Standard: Computers, office equipment, communications equipment, test and measurement equipment, audio and visual equipment, home electronic appliances, machine tools, personal electronic equipment and industrial robots Special: Transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster systems, anti-crime systems, safety equipment and medical equipment (not specifically designed for life support) Specific: Aircrafts, aerospace equipment, submersible repeaters, nuclear reactor control systems, life support systems or medical equipment for life support, etc. The quality grade of NEC devices is "Standard" unless otherwise specified in NEC's Data Sheets or Data Books. If customers intend to use NEC devices for applications other than those specified for Standard quality grade, they should contact an NEC sales representative in advance. Anti-radioactive design is not implemented in this product.
Printed on recycled paper

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