NEC LD7263 Datasheet

DATA SHEET

HIGH POWER TRAVELING WAVE TUBE

FOR COMMUNICATIONS

LD7263

14 GHz, 750 W CW, CONDUCTION COOLING, HIGH POWER GAIN

GENERAL DESCRIPTION

The NEC LD7263 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 750 W over the range of 1 3.75 to 14.5 GHZ and provides a

power gain of more than 47 dB at 750 W Ievel.

Furthermore, this is of rugged and reliable design offering long-Iife 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.

™ Simple Cooling System

The tube is conduction cooled, so that the cooling system is simplified.

™ 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. ET0479EJ1V0DS00
Date Published September 1999 M
Printed in Japan

The information in this document is subject to change without notice.

©

1999

GENERAL CHARACTERISTICS

ELECTRICAL

Frequency ……………………………………………… 13.75 to 14.5 GHz
Output Power ………………………………………… 750 W
Heater Voltage ………………………………………… 6.3 V
Heater Current ………………………………………… 1.4 A
Type of Cathode ……………………………………… Indirectly heated, Impregnated
Cathode Warm-up Time …………………………… 180 s

MECHANICAL

Dimensions …………………………………………… See Outline
Weight ………………………………………………… 3.5 kg approx.
Focusing ……………………………………………… Periodic Permanent Magnet
Mounting Position …………………………………… Any
Electrical Connections ……………………………… Flying Leads
RF Connections

Input ………………………………………………… Type SMA Female
Output ……………………………………………… WR75, UBR-120 Flange

Cooling ………………………………………………… Conduction

LD7263

ABSOLUTE RATINGS (Note 1, 2 and 3 )

ELECTRICAL

Heater Voltage ……………………………………… 6.0 6.6 V
Heater Surge Current …………………………… – 3.0 A
Heater Current ……………………………………… – 2.0 A
Heater Warm-up Time …………………………… 180 – s
Helix Voltage ……………………………………… 10.2 11.7 kV
Helix Current ……………………………………… – 15.0 mA
Collector-1 Voltage ………………………………… 5.3 6.8 kV
Collector-1 Current ………………………………… – 320 mA
Collector-2 Voltage ………………………………… 2.3 3.4 kV
Collector-2 Current ………………………………… – 450 mA
RF Drive Power …………………………………… – 15 dBm
Load VSWR ………………………………………… – 1.5 : 1 –

ENVIRONMENTAL

Base Plate Temperature ………………………… –40 +105 ˚C
Storage Temperature ……………………………… –50 +85 ˚C

Min. Max. Unit

Min. Max. Unit

2

DATA SHEET ET0479EJ1V0DS00