NEC LD7213L, LD7213 Datasheet

DATA SHEET

HIGH POWER TRAVELING WAVE TUBE

FOR GROUND TERMINALS

LD7213, LD7213L

14 GHz, 300 W CW, CONDUCTION COOLING,

HIGH POWER GAIN, FLAT GAIN VARIATION

GENERAL DESCRIPTION

The NEC LD7213 and LD7213L are PPM-focused traveling wave-tubes designed for use as final amplifiers in the

earth-to-satellite communications transmitter.

These are capable of delivering an output power of 300 W over the range of 14.0 to 14.5 GHz and 13.75 to 14.5

GHz.

They provide a high power gain of 55 dB at 300 W output, and flat gain variation of 1.5 dB at any power level.
LD7213 is fully compatible with TH3759K.

FEATURES

™ High Power Gain

The power gain is typically 58 dB at small signal level and 55 dB at 300 W level.

™ Simple Cooling System

The tubes are conduction-cooled, so that the cooling systems are greatly simplified.

™ PPM (Periodic Permanent Magnet) Focusing

The tubes are PPM (Periodic Permanent Magnet) -focused, eliminating entirely the focusing power supplies and
interlock circuits.

™ Rugged Construction

The tubes are designed to be rugged, therefore they are suitable for transportable systems.

™ Long Life and High Stability

The tubes employ advanced impregnated cathodes 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 digital communication service.

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. ET0191EJ2V1DS00 (2nd edition)
Date Published August 1998 M
Printed in Japan

©

1996

GENERAL CHARACTERISTICS

ELECTRICAL

Frequency ……………………………………………… LD7213 : 14.0 to 14.5 GHz

Cathode ………………………………………………… Indirectly heated, Impregnated

Heater Voltage …………………………………… 6.1 V
Heater Current …………………………………… 1.05 A

MECHANICAL

Dimensions …………………………………………… See Outline
Focusing ……………………………………………… Periodic Permanent Magnet
Electrical Connections ……………………………… AMP861647-8
RF Connections

Input ………………………………………………… SMA Female

Output ……………………………………………… Mates with UBR-120 Flange
Mounting Position ……………………………………Any
Weight ………………………………………………… 5 kg approx.
Cooling ………………………………………………… Conduction

LD7213, LD7213L

LD7213L : 13.75 to 14.5 GHz

ABSOLUTE RATINGS (Note 1, 2 and 3)

ELECTRICAL

Heater Voltage……………………………………… 5.5 6.3 V
Heater Surge Current …………………………… – 2.5 A
Heater Current ……………………………………… – 1.6 A
Heater Warm-up Time …………………………… 180 – s
Collector Voltage …………………………………… 3.5 4.6 kVdc
Helix Voltage ……………………………………… 8.2 9.0 kVdc
Cathode Current …………………………………… – 260 mAdc
Helix Current ……………………………………… – 10 mAdc
Collector Dissipation ……………………………… – 1.2 kW
Helix Dissipation …………………………………… – 50 W
RF Drive Power …………………………………… – 5 mW
Reflected Power …………………………………… – 10 W
Load VSWR ………………………………………… – 2 : 1

MECHANICAL

Ambient Temperature …………………………… –40 +95 ˚C

Min. Max. Unit

2