DATA S H E E T
HIGH POWER KLYSTRON
FOR GROUND TERMINALS
LD7111 SERIES
17 GHz BAND, 1.7 kW, HIGH EFICIENCY, HIGH POWER GAIN
GENERAL DESCRIPTION
The series of NEC LD7111 is a five-cavity Klystron Amplifier
and ideal for use in the earth-to-satellite communication sys-
tems. These are designed for operating at 1.7 kW CW over the
frequency range of 17.3 to 18.4 GHz.
The instantaneous bandwidth of minus one-decibel is at least
90 MHz over the entire 1.1 GHz range.
All tubes are forced-air-cooled at any power level. An auto-
matic channel tuner, which changes the operating frequency very
quickly and simply, is available in all the series.
Furthermore, they are of rugged and reliable design offering
long life service.
NEC LD7111 series is compatible with VKU7791Z6 by using
an additional adapter.
FEATURES
™
Compact and Light Weight (27 kg approx.)
™
High Efficiency
(The DC to RF conversion efficiency is typically 23 % or
higher.)
™
High Power Gain
™
Long Life and High Stability
™
Simple Cooling System (forced-air-cooled)
™
Automatic Channel Tuner (8-12 Channels)
Hand Tuner model is also available.
™
Permanent Magnet Focusing
™
Rugged Construction
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. ET0404EJ2V0DS00 (2nd edition)
(GC-1069)
Date Published August 1998 M
Printed in Japan
©
1994
LD7111 SERIES
GENERAL CHARACTERISTICS
ELECTRICAL
Frequency ………………………………………………
Output Power …………………………………………
Heater Voltage …………………………………………
Heater Current …………………………………………
Cathode Type …………………………………………
Cathode Warm-up Time ……………………………
MECHANICAL
Dimensions ……………………………………………
Weight …………………………………………………
Focusing ………………………………………………
Mounting Position ……………………………………
Cooling …………………………………………………
Electrical Connections ………………………………
RF Connections
Input …………………………………………………
Output ………………………………………………
Cavity Tuning Method ………………………………
Mates with UG-419/U Flange
Mates with UG-419/U Flange
8-12 Channel Preset Tuning
(Hand Tuner is also available)
See Outline
27 kg approx.
Permanent Magnet
Vertical (Cathode down)
Forced Air
See Outline
17.3 to 18.4 GHz
1.7 kW
6.5 V
3.2 A
Indirectly Heated, Impregnated
300 s
ABSOLUTE RATINGS ( Note 1, 2 and 3 )
ELECTRICAL
Heater Voltage …………………………………………
Heater Surge Current
………………………………
Heater Current …………………………………………
Heater Warm-up Time ………………………………
Body Voltage …………………………………………
Body Current …………………………………………
Collector Voltage ………………………………………
Collector Current ………………………………………
Cathode Current ………………………………………
DC Input Power ………………………………………
Load VSWR
Normal Value ………………………………………
Instantaneous Value ………………………………
MECHANICAL
Collector Temperature ………………………………
Cooling Air Temperature ……………………………
Collector Air Flow ……………………………………
Body Air Flow …………………………………………
Gun Air Flow …………………………………………
ENVIRONMENTAL
Ambient Temperature
Operating ……………………………………………
Storage ………………………………………………
+5
–50
+50
+70
°C
°C
–
–10
515
83
41
+250
+50
–
–
–
°C
°C
kg/hr
kg/hr
kg/hr
–
–
1.2 : 1
1.5 : 1
Min.
4.5
–
–
300
–
–
–
–
–
–
Max.
7.8
7.0
4.5
–
10.0
25.0
10.0
1.0
1.0
9.3
Unit
V
A
A
s
kV
mA
kV
A
A
kW
2
LD7111 SERIES
TYPICAL OPERATION (Note 3, 4 and 5)
Unit
Frequency …………………………………………………
Heater Voltage (Note 4) …………………………………
Heater Current ……………………………………………
Body Voltage ………………………………………………
Body Current ………………………………………………
Collector Voltage …………………………………………
Collector Current …………………………………………
Cathode Current …………………………………………
DC Input Power
…………………………………………
17.7
6.5
3.2
9.4
3.0
9.4
0.85
0.85
8.0
100
1.8
42
90
530
2,000
85
34
43
GHz
V
A
kV
mA
kV
A
A
kW
mW
kW
dB
MHz
kg/hr
Pa
kg/hr
Pa
kg/hr
Driving Power ……………………………………………
Output Power ……………………………………………
Power Gain ………………………………………………
Band Width (-1 dB) ………………………………………
Collector Air Flow ………………………………………
Collector Air Pressure Drop ……………………………
Body Air Flow ……………………………………………
Body Air Pressure Drop …………………………………
Gun Air Flow ………………………………………………
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. Equipment design should limit voltage and environmental variations so that ratings will be
exceeded.
Note 2 :
The Klystron body should be at ground potential in operation.
Note 3 :
All voltages are referred to the cathode potential except the heater voltage.
Note 4 :
The optimum operating value is shown on a test performance sheet for each tube.
Note 5 :
Characteristics and operating values on this Data Sheet are based on performance test. These values
may be changed as a result of additional information or product improvement. NEC should be con-
sulted before using this information for equipment design. This data sheet should not be referred to a
contractual specification.
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, copy-
rights or other intellectual property rights of NEC Corporation or others.
3
LD7111 SERIES
LD7111 SERIES OUTLINE
(Unit in mm)
(260)
234.7
±
0.5
(208)
(
φ
38)
A
(147)
33
±
1.5
(180)
5.8
±
0.1
106
±
3
(128)
133.4
±
0.25
142.2
±
0.5
(177.8)
0.01
φ
6.3
+0.05
–
(10)
Detail B
B
139.7
±
0.25
252.5
±
0.25
(275)
4 -
φ
5.6
(125)
Electrode
Heater
Heater-Cathode
Color of Lead
Yellow
White
Lock / Unlock Shaft
Channel Shaft
Body Col & Thermostat
5-
φ
5
φ
115
±
1
Terminal
Thermostat
(Nomally Close)
4-No.4-40 UNC
17.5
±
0.3
depth 5.8 MAX.
RF Output
(111)
UG-419 / U
27
±
0.3
(8)
5.8±0.1
(
φ
70)
(208)
(14.65)
(6.5)
15.5
±
0.3
(201)
(224)
26.15
±
0.3
RF Input
36.84
±
0.3
36.84
±
0.3
UG-419 / U
View from A
190
±
2
148
±
2
(136)
390 MAX.
(13.4)
(7)
(335)
RF/Wirelessly
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