NEC LD7215W Datasheet
DATA SHEET
HIGH POWER TRAVELING WAVE TUBE
FOR GROUND TERMINALS
LD7215W
6 GHz, 3 kW CW, PPM FOCUSING, HIGH POWER GAIN
GENERAL DESCRIPTION
NEC LD7215W is a PPM-focused traveling wave tube designed for use as final amplifier in the earth-to-satellite
communications transmitter.
This is capable of delivering an output power of 3 kW over the range of 5.85 to 6.65 GHz.
It provides a high power gain of 42 dB at a rated output power.
Furthermore, this is of rugged and reliable design offering long-life service.
FEATURES
™ High Power Gain
The power gain is typically 42 dB minimum at 3 kW level.
™ Simple Cooling System
The tube is forced-air-cooled, so that the cooling systems are simplified.
™ PPM Focusing
The tube is PPM (Periodic Permanent Magnet) -focused, eliminating entirely the focusing power supplies and
interlock circuits.
™ Rugged Construction
The tube is designed to be rugged, therefore it is suitable for transportable systems.
™ Long Life and High Stability
The tube employs an advanced impregnated cathode with a low operating temperature for long life.
™ 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” (ET0048EJ∗V∗UM00)
The information in this document is subject to change without notice.
Document No. ET0214EJ2V1DS00 (2nd edition)
Date Published August 1998 M
Printed in Japan
©
1996
GENERAL CHARACTERISTICS
ELECTRICAL
Frequency ……………………………………………… 5.85 to 6.65 GHz
Output Power ………………………………………… 3 kW
Heater Voltage…………………………………………6.3 V
Heater Current ………………………………………… 4.5 A
Type of Cathode ……………………………………… Indirectly heated, Impregnated
Cathode Warm-up Time …………………………… 300 s
MECHANICAL
Dimensions …………………………………………… See outline
Weight ………………………………………………… 30 kg approx.
Focusing ………………………………………………Periodic Permanent Magnet
Mounting Position …………………………………… Any
Electrical Connections ……………………………… Flying Leads
Heater, Heater-Cathode,
Helix, Anode, Collector
and Thermal Protection
RF Connections
Input ………………………………………………… Type SMA Female
Output ……………………………………………… Mates with CPR-137F Flange
Cooling ………………………………………………… Forced Air
LD7215W
ABSOLUTE RATINGS (Note 1, 2 and 3 )
ELECTRICAL
Heater Voltage……………………………………… 6.0 6.6 V
Heater Surge Current …………………………… – 8.0 A
Heater Current ……………………………………… 3.0 5.0 A
Heater Warm-up Time …………………………… 300 – s
Helix Voltage ……………………………………… 12.5 13.7 kV
Helix Current ……………………………………… – 25 mA
Anode Voltage……………………………………… 10.0 13.0 kV
Anode Current ……………………………………… –0.5 0.5 mA
Collector Voltage …………………………………… 8.0 9.5 kV
Cathode Current …………………………………… – 1.5 mA
Drive Power ………………………………………… – 24 mW
Load VSWR ………………………………………… – 1.15 : 1
MECHANICAL
Cooling Air Flow …………………………………… 720 – kg/ hr
Operating temperature …………………………… 0 +45 ˚C
Inlet air temperature ……………………………… –20 +45 ˚C
Storage temperature ……………………………… –30 +70 ˚C
Min. Max. Unit
Min. Max. Unit
2
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