NEC LD7260 Datasheet
DATA SHEET
HIGH POWER TRAVELING WAVE TUBE
FOR COMMUNICATIONS
LD7260
6 GHz, 2.25 kW CW, PPM FOCUSING, HIGH POWER GAIN
GENERAL DESCRIPTION
The NEC LD7260 is a PPM-focused traveling wave tube designed for use as final amplifiers in the earth-to-
satellite communications transmitter.
This is capable of delivering an output power of 2.25 kW over the range of 5.85 to 6.425 GHZ and provides a
power gain of 44 dB at rated output power. This is equipped with dual-stage depressed collector for enhancing
overall efficiency.
Furthermore, this is of rugged and reliable design offering long-life service.
FEATURES
™ Lightweight, Compact and Efficient
The tube has dual-depressed collectors and designed to operate at high efficiency across the power output
range. It features state-of-the-art techniques to optimize size and efficiency.
™ Low Distortion
Distortion is a very important factor in multiplex digital signals transmission. NEC has developed techniques
for the correction of non-linear distortion and phase generated in a TWT. As a result, the TWT has an optimum performance across a broad power range and is ideally suited for multi-carrier transmission systems.
™ Rugged Construction
The power gain 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.
™ Micro-discharge 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)
Document No. ET0478EJ1V0DS00
Date Published September 1999 M
Printed in Japan
The information in this document is subject to change without notice.
©
1999
GENERAL CHARACTERISTICS
ELECTRICAL
Frequency ……………………………………………… 5.850 to 6.425 GHz
Output Power ………………………………………… 2.25 kW
Heater Voltage ………………………………………… 6.3 V
Heater Current ………………………………………… 1.5 A
Type of Cathode ……………………………………… Indirectly heated, Impregnated
Cathode Warm-up Time …………………………… 180 s
MECHANICAL
Dimensions …………………………………………… See Outline
Weight ………………………………………………… 11 kg approx.
Focusing ………………………………………………Periodic Permanent Magnet
Mounting Position …………………………………… Any
Electrical Connections ……………………………… AMP LGH 1I Receptacle
RF Connections
Input ………………………………………………… Type SMA Female
Output ……………………………………………… Mates with CPR-137F Flange
Cooling ………………………………………………… Forced Air
LD7260
ABSOLUTE RATINGS (Note 1, 2 and 3 )
ELECTRICAL
Heater Voltage ……………………………………… 6.0 6.6 V
Heater Surge Current …………………………… – 5.0 A
Heater Current ……………………………………… – 5.0 A
Heater Warm-up Time …………………………… 180 – s
Helix Voltage ……………………………………… 12.0 16.0 kV
Helix Current ……………………………………… – 25.0 mA
Collector-1 Voltage ………………………………… 9.0 11.0 kV
Collector-1 Current ………………………………… – 600 mA
Collector-2 Voltage ………………………………… 4.0 6.0 kV
Collector-2 Current ………………………………… – 925 mA
Cathode Current …………………………………… – 1000 mA
RF Drive Power …………………………………… – 90 mW
Load VSWR ………………………………………… – 1.5 : 1 –
ENVIRONMENTAL
Operating Temperature …………………………… –20 +52 ˚C
Storage Temperature ……………………………… –62 +80 ˚C
Min. Max. Unit
Min. Max. Unit
2
DATA SHEET ET0478EJ1V0DS00
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