DATA SHEET

Document No. ET0225EJ2V0DS00

Date Published September 1998 M

Printed in Japan

14 GHz, 40 W CW, LIGHT WEIGHT, COMPACT, EFFICIENT

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

©

1996

MICROWAVE POWER MODULE

FOR GROUND TERMINALS

LD79U04K

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

handling electron tubes” (ET0048EJ

∗V∗UM00)

GENERAL DESCRIPTION

NEC Microwave Power Module (MPM) LD79U04K is a microwave power device in which a traveling wave tube

(TWT) and an electric power conditioner (EPC) are combined, so that both components can accomplish each full

performance.

LD79U04K delivers an output power of 40 W over the range of 13.75 to 14.5 GHz with a gain of 25 dB.

The TWT in the LD79U04K has been designed and developed upon the NEC's advanced technology and enor-

mous experience on a number of TWTs used in satellite ground terminals and terrestrial microwave links.

The very small and light weight EPC designed with sophisticated and experienced circuit technology ensures

higher reliability, reduced maintenance costs and improved technical performance.

The LD79U04K is most suitable for a power amplifier in digital communication systems.

A configuration of separated TWT and EPC can offer superior flexibility of design for high power section of

transmitters.

FEATURES

™ Light weight, Compact, and Efficient

The TWT has a dual-depressed collector and is designed to operate at high efficiency across the power output

range. The EPC features state-of-the-art techniques to optimize size and efficiency and the combination results

in a unit significantly smaller and with less power consumption than a comparable solid state amplifier.

™ Low Distortion

NEC has developed techniques for the correction of non-linear distortion of gain and phase generated in a TWT.

As a result, the MPM has optimum performance across a broad power range and is ideally suited for multi-

carrier transmission systems.

™ Long Life

The TWT in NEC's MPM is designed to have a lifetime of 100,000 hours or more, which is comparable to that of

a solid state amplifier in actual usage.

™ Ideal for Digital Systems

A mini-arcing in the electron gun have been eliminated in the TWT used in the MPM.