LD7710 [NEC]

14GHz, 40 W CW PPM FOCUSING, MINIMUM SIZE; 14GHz ， 40瓦CW PPM聚焦，最小尺寸


型号：	LD7710
厂家：	NEC
描述：	14GHz, 40 W CW PPM FOCUSING, MINIMUM SIZE 14GHz ， 40瓦CW PPM聚焦，最小尺寸
文件：	总4页 (文件大小：127K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

DATA SHEET

MEDIUM POWER TRAVELING WAVE TUBE

^{FOR GROUN}L^{D T}D^ER7^M7^IN1^AL0^S

14GHz, 40 W CW PPM FOCUSING, MINIMUM SIZE

GENERAL DESCRIPTION

The NEC LD7710 is a PPM focused traveling wave tube designed for final amplifier tube in the earth-to-satellite

communication's transmitter.

This is capable of delivering an output power of 40 W over the range of 13.75 to 14.5 GHz.

It provides a mid power gain of 26 dB at 40 W level.

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

FEATURES

™ Lightweight, Compact and Efficient

The tube has a dual-depressed collectors and is 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 of gain 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.

™ Right Power Gain for Minimum Size

The power gain is designed into 26 dB at 40 W level in order to keep the tube length minimum.

™ Simple Cooling System

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

™ PPM Focusing

The tube is PPM (Periodic Permanent Magnet) -focused, eliminating entirely the focusing power supplies and

interlock circuits.

™ Rugged Construction

The tube 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 the low operating temperature for long life. The

TWT is designed to have a lifetime of 100,000 hours or more.

™ Microdischarge Free

The tube is carefully designed to be free from microdischarge in the electron gun for long time operation,

therefore it is suitable for digital communication services.

For safety 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. ET0199EJ2V0DS00 (2nd edition)

Date Published May 1997 M

Printed in Japan

1996

LD7710

GENERAL CHARACTERISTICS

ELECTRICAL

Frequency …………………………………………… 13.75 to 14.5 GHz

Output Power ……………………………………… 40 W

Heater Voltage ……………………………………… 6.3 V

Heater Current ……………………………………… 0.81 A

Heater Surge Current …………………………… 2.5 A

Type of Cathode …………………………………… Indirect-Heated Impregnated

Cathode Warm-up Time ………………………… 180 s

MECHANICAL

Dimensions ………………………………………… See Outline Drawing

Weight ……………………………………………… 350 g approx.

Focusing …………………………………………… Periodic Permanent Magnet

Mounting Position ………………………………… Any

Cooling ……………………………………………… Conduction

Electrical Connections …………………………… Flying Leads

Heater, Heater-Cathode,

Helix, Collector-1, Collector-2

RF Connections

Input ……………………………………………… SMA-Female

Output …………………………………………… SMA-Female

ABSOLUTE RATINGS (Note 1, 2 and 3)

ELECTRICAL

Min.

6.0

–

Max.

6.6

Unit

Heater Voltage ………………………………………

Heater Surge Current ……………………………

Heater Current ………………………………………

2.5

–

1.2

Heater Warm-up Time …………………………… 180

Helix Voltage ……………………………………… 2.95

–

3.45

5.0

kVdc

mAdc

kVdc

mAdc

kVdc

mAdc

dBm

–

Helix Current ………………………………………

Collector-1 Voltage …………………………………

Collector-1 Current …………………………………

Collector-2 Voltage …………………………………

Collector-2 Current …………………………………

Drive Power …………………………………………

Load VSWR …………………………………………

–

1.6

–

2.0

0.8

–

1.0

110

–

1.5 : 1

MECHANICAL

Min.

Max.

+90

Unit

˚C

Heat Sink Temperature …………………………… –30

Storage Temperature……………………………… –40

+90

˚C

LD7710

TYPICAL OPERATION (Note 2, 3 and 5)

Unit

GHz

Frequency

13.75 to 14.5

Saturated Output Power

Heater Voltage (Note 4)

Heater Current

6.3

0.81

3.2

2.0

1.8

Helix Voltage

kVdc

mAdc

kVdc

mAdc

kVdc

mAdc

Helix Current

Collector-1 Voltage

Collector-1 Current

Collector-2 Voltage

Collector-2 Current

Cathode Current

0.9

100

Power Gain

at 4 W ……………………… 34

at 40 W ……………………… 29

Gain Variation

Gain Slope

at 4 W ……………………… 2.5

at 4 W ……………………… 0.02

dB/750 MHz

dB/MHz

deg./dB

AM-PM Conversion at 40 W ……………………… 3.5

3rd Order Intermodulation

(two equal carriers, 8 W total) ……………………… –29

dBc

Overall Efficiency

……………………………… 31

Note 1 : Absolute rating should not be exceeded under continuous or transient conditions. A single absolute

rating may be the limitation and simultaneous operation at more than one absolute rating may not

be possible.

Note 2 : The tube body is at ground potential in operation.

Note 3 : All voltages are referred to the cathode potential except the heater voltage.

Note 4 : The optimum operating parameters are shown on a test performance sheet for each tube.

Note 5 : These characteristics and operating values may be changed as a result of additional information or

product improvement. NEC should be consulted before using this information for equipment de-

sign. This data sheet should not be referred for a contractual specification.

LD7710

LD7710 OUTLINE (Unit in mm)

23.8

6- 4.5

RF Output

SMA-Female

RF Input

SMA-Female

High Voltage

Connection

Lead Length = 300

NEC Corporation does not assume any liability for infringement of patents, copyrights or other intellectual

property rights of third parties by or arising from use of a device described herein or any other liability arising

from use of such device. No license, either express, implied or otherwise, is granted under any patents, copyrights

or other intellectual property rights of NEC Corporation or others.

LD7710 [NEC]

相关型号：

LD7713

LD7714

LD7714F-S017

LD7714F-S01F

LD7714F-S01L

LD7714F-S01R

LD7714F-S01V

LD7714H-S017

LD7714H-S01F

LD7714H-S01L

LD7714H-S01R

LD7714H-S01V