NEC LD4606A Datasheet

DATA SHEET

HIGH POWER CW KLYSTRONAMPLIFIER

30 GHz, 380 W CW, HIGH EFFICIENCY, HIGH POWER GAIN

GENERAL DESCRIPTION

The NEC LD4606A is a five-cavity Klystron amplifier and
ideal for use in the earth-to-satellite communications trans­mitter.

This is designed for operating at 380 W CW power lev­els in the frequency range of 27.50 to 29.10 GHz. The in­stantaneous bandwidth of minus one-decibel is at least
70 MHz over the entire 1.6 GHz range.

The tube is forced-air-cooled at the 380 W operation.

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

FOR GROUND TERMINALS

LD4606A

FEATURES

1 High Efficiency

The DC to RF conversion efficiency is typically 23 %
by incorporating a 39 % depressed collector.

2 High Power Gain

The power gain is typically 40 dB at the 380 W level,
so the driving power is less than 50 mW.

3 Simple Cooling System

The klystron is all forced air cooled with only one
blower, so that the cooling systems are greatly sim­plified.

4 Permanent Magnet

The klystron is permanent magnet focused, eliminat­ing entirely the requirement for focusing power sup­plied and interlock circuits.

5 Rugged Construction

The klystron is designed to be rugged.

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. ET0117EJ3V1DS00 (3rd edition)
Date Published August 1998 M
Printed in Japan

©

1989

GENERAL CHARACTERISTICS

ELECTRICAL

Frequency ……………………………………………… 27.50 to 29.10 GHz
Output Power ………………………………………… 380 W
Heater Voltage………………………………………… 4.3 V
Heater Current ………………………………………… 2.5 A
Type of Cathode ……………………………………… Indirectly Heated, Impregnated

MECHANICAL

Dimensions …………………………………………… See Outline
Focusing ……………………………………………… Permanent Magnet
Electrical Connections

Heater ……………………………………………… AMP (861647-8) Receptacle
Heater-Cathode …………………………………… AMP (861647-8) Receptacle
Body, Collector …………………………………… AMP (861647-8) Receptacle

RF Connections

Input ………………………………………………… Mates with FUBR-260

Output ……………………………………………… Mates with FUBR-260
Mounting Position …………………………………… Vertical (Cathode down)
Weight ………………………………………………… 45 kg approx.
Cooling

Gun ………………………………………………… Forced Air

Collector …………………………………………… Forced Air

Body ………………………………………………… Forced Air
Cavity Tuning Method ……………………………… Hand Tuning

LD4606A

ABSOLUTE RATINGS ( Note 1, 2 and 3 )

ELECTRICAL Min. Max. Unit

Heater Voltage………………………………………… 3.5 5.5 V
Heater Surge Current ……………………………… – 5.5 A
Heater Warm-up Time ……………………………… 300 – s
Body Voltage ………………………………………… – 9.5 kV
Collector Voltage ……………………………………… – 9.0 kV
Beam Current ………………………………………… – 400 mA
Body Current ………………………………………… – 20 mA
Collector Current……………………………………… – 400 mA
DC Input Power ……………………………………… – 2.5 kW
Load VSWR

Normal Value ……………………………………… – 1.2

Instantaneous Value ……………………………… – 1.5

MECHANICAL

Collector Temperature ……………………………… – 200 °C
Cooling Air Temperature …………………………… –10 45 °C
Air Flow for Collector Body and Gun …………… 238 – kg/hr
Ambient Temperature

Operating …………………………………………… –10 45 °C

Storage ……………………………………………… –40 70 °C

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