2

LD7261

GENERAL CHARACTERISTICS

ELECTRICAL

Frequency ……………………………………………… 18.0 to 21.7 GHz

Output Power ………………………………………… 250 W

Heater Voltage ………………………………………… 6.3 V

Heater Current ………………………………………… 1.42 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 ……………………………… Flying Leads

RF Connections

Input ………………………………………………… SMA Female

Output ……………………………………………… Mates with WR-51 waveguide (see outline)

Cooling ………………………………………………… Forced Air

ABSOLUTE RATINGS (Note 1, 2 and 3 )

ELECTRICAL

Min.

Max.

Unit

Heater Voltage ………………………………………

6.0

6.6

V

Heater Surge Current

……………………………

–

2.5

A

Heater Current ………………………………………

–

1.8

A

Heater Warm-up Time ……………………………

300

–

s

Helix Voltage

………………………………………

9.5

10.8

kV

Helix Current

………………………………………

–

15.0

mA

Anode Voltage ………………………………………

8.0

10.25

kV

Anode Current ………………………………………

–

0.5

mA

Collector Voltage ……………………………………

4.0

5.8

kV

Collector Current ……………………………………

–

350

mA

Cathode Current ……………………………………

–

350

mA

RF Drive Power ……………………………………

–

25

mW

RF Output Power

…………………………………

–

400

W

Load VSWR …………………………………………

–

1.2 : 1

–

ENVIRONMENTAL

Min.

Max.

Unit

Temperature at output Flange ……………………

–40

+110

˚C

Air Flow ………………………………………………

195

–

kg/hour

Ambient Temperature

Storage ……………………………………………

–40

+80

˚C

Operation …………………………………………

–10

+50

˚C