DATA SHEET

Document No. ET0139EJ5V0DS00 (5th edition)

Date Published August 1998 M

Printed in Japan

6 GHz, 3 kW, HELIX TYPE, PPM FOCUSING,

HIGH POWER GAIN, FLAT GAIN VARIATION

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

©

1991

HIGH POWER TRAVELING WAVE TUBE

FOR GROUND TERMINALS

LD7215, LD7215C, LD7215D

For safe use of microwave tubes, refer to NEC document “Safety instructions to all personnel

handling electron tubes” (ET0048EJ

∗V∗UM00)

GENERAL DESCRIPTION

The NEC LD7215, LD7215C and LD7215D are PPM-focused traveling wave tubes designed for use as the final

amplifiers in the earth-to-satellite communications transmitter.

These are capable of delivering an output of 3 kW over the range of 5.85 to 6.425 GHz.

They provide a high power gain of 46 dB at an output power of 3 kW, and flat gain variation of 2.5 dB by LD7215,

1.0 dB by LD7215C and LD7215D at small signal level in the full frequency range.

Furthermore, they are of rugged and reliable design offering long-life service.

Both LD7215 and LD7215D are fully compatible with TH3640.

FEATURES

™ High Power Gain

The power gain is typically 52 dB at small signal level and 46 dB at 3 kW Ievel.

™ Simple Cooling System

All the tubes are forced-air-cooled, so that the cooling system is greatly simplified.

™ PPM Focusing

The tubes are PPM (Periodic Permanent Magnet) focused, and eliminate entirely the requirement for focusing

power supplies and interlock circuits.

™ Long Life and High Stability

The tubes employ 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.