NEC LD7202L, LD7202B, LD7202A, LD7202, LD7202W Datasheet

DATA SHEET

HIGH POWER TRAVELING WAVE TUBE

FOR GROUND TERMINALS

LD7202 SERIES

14 GHz, 600 W CW, PPM FOCUSING, HIGH POWER GAIN

GENERAL DESCRIPTION

NEC LD7202 series of PPM-focused traveling wave tubes are designed for use as final amplifiers tube in the

earth-to-satellite communications transmitter.

These are capable of delivering an output power of 600W over the range of 12.75 to 14.5 GHz and provide a high

power gain of 52 dB at 600 W output power.

Furthermore, they are of rugged and reliable design offering long-life service. The LD7202 is fully compatible with TH3591B.

FEATURES

™ High Power Gain

The power gain is typically 52 dB at 600 W level.

™ Simple Cooling System

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

™ PPM Focusing

All 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 an 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.

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. ET0141EJ2V1DS00 (2nd edition) Date Published August 1998 M Printed in Japan

1989(1995)

GENERAL CHARACTERISTICS

ELECTRICAL

Frequency

LD7202, LD7202A, LD7202B............................................. 14.0 to 14.5 GHz

LD7202L ............................................................................. 13.75 to 14.5 GHz

LD7202W............................................................................ 12.75 to 13.25 GHz, 13.75 to 14.5 GHz

Output Power ............................................................................ 600 W

Heater Voltage........................................................................... 6.3 V

Heater Current........................................................................... 1.4 A

Type of Cathode........................................................................ Indirectly heated, Impregnated

Cathode Warm-up Time ........................................................... 300 s

MECHANICAL

Dimensions................................................................................ See Outline

Weight........................................................................................ 6.0 kg approx.

Focusing .................................................................................... Periodic Permanent Magnet

Mounting Position .................................................................... Any

Electrical Connections .............................................................. See Outline Drawing

RF Connections

Input ................................................................................... SMA-Female

Output ................................................................................ Mates with UBR-120 Flange

Thermal Switch Connections................................................... See Outline Drawing

Cooling....................................................................................... Forced Air

LD7202 SERIES

ABSOLUTE RATINGS

ELECTRICAL

Heater Voltage.................................................................. 5.5 6.5 V

Heater Surge Current ...................................................... – 4.5 A

Heater Current.................................................................. – 3 A

Heater Warm-up Time ..................................................... 300 – s

Collector Voltage∗............................................................ 4.75 6.2 kV

Collector Current.............................................................. – 425 mA

Helix Voltage .................................................................... 10.25 10.75 kV

Helix Current .................................................................... – 12 mA

Anode Voltage.................................................................. 5.5 6.5 kV

Anode Current.................................................................. – 0.5 mA

Collector Dissipation ....................................................... – 2.4 kW

RF Drive Power ................................................................ – 20 mW

Output Power ................................................................... – 670 W

Load VSWR∗∗................................................................... – 1.15:1

∗

The voltage between a helix and a collector must not exceed 8 kV.

∗∗

Load VSWR must be met as follows.

(Note 2, 3 and 4)

Min. Max. Unit

In Band .......................................................... 1.15 : 1 max.

13.5 to 15.0 GHz............................................ 1.5 : 1 max. (LD7202, LD7202A, LD7202B)

13.25 to 15.0 GHz.......................................... 1.5 : 1 max. (LD7202L)

12.25 to 15.0 GHz.......................................... 1.5 : 1 max. (LD7202W)

15.0 to 16.0 GHz............................................ 1.8 : 1 max.

16.0 to 17.0 GHz............................................ 2.2 : 1 max.

MECHANICAL

Min. Max. Unit

Air Flow of Collector........................................................ 252 – kg/ hr

Ambient Temperature (Operation) ................................. – 10 + 50 ˚C

Storage Temperature....................................................... – 40 + 80 ˚C

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