3

LD7249 SERIES

DATA SHEET ET0221EJ5V0DS00

TYPICAL OPERATION (Note 2, 3 and 5)

LD7249

LD7249U

Unit

Frequency ………………………………………………

14.25

14.25

GHz

Output Power …………………………………………

350

400

W

Heater Voltage (Note 4) ………………………………

6.3

6.3

V

Heater Current …………………………………………

1.2

1.2

A

Helix Voltage ……………………………………………

8.6

8.8

kV

Helix Current ……………………………………………

1.5

2.4

mA

Collector-1 Voltage ……………………………………

4.3

4.4

kV

Collector-1 Current ……………………………………

141

147

mA

Collector-2 Voltage ……………………………………

2.7

2.8

kV

Collector-2 Current ……………………………………

94

100

mA

Cathode Current ………………………………………

237

250

mA

Power Gain

at 20 W ………………………

62

58

dB

at 350 W ………………………

58

54

dB

Gain Variation

at 20 W ………………………

0.86

1.02

dB/750MHz

Gain Slope

at 40 W ………………………

0.006

0.006

dB/MHz

AM-PM ConversioN

Less than 100 W ……………………………

0.3

0.3

deg./dB

at 350 W ………………………………………

2.5

2.5

deg./dB

3rd Order Intermodulation

…………………………

–23

–24

dBc

(two equal carriers, 100 W total)

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

design. This data sheet should not be referred to a contractual specification.