4CX20-000E Datasheet, PDF (1/1 Pages) Communications & Power Industries, Inc. – RF power amplifier

4CX20,000E
The 4CX20,000E is a ceramic/metal power tet-
rode intended for use as a VHF power amplifier. It
features a type of internal mechanical structure,
which results in rf operating efficiency. Low rf
losses in this structure permit operation at full rat-
ings to 110 MHz.
The 4CX20,000E provides high gain in FM Broad-
cast service and is also recommended for rf linear
power amplifier service, including IBOC digital
transmission. The anode is rated for 20 kilowatts
of dissipation with forced-air cooling and incor-
porates a compact, highly efficient cooler of new
design
Characteristics
Plate Dissipation (Max.)
Screen Dissipation (Max.)
Grid Dissipation (Max.)
Frequency for Max. rating (CW)
Amplification Factor
Filament/Cathode
Voltage
Current
Capacitance
Input
Output
Feedthrough
Capacitance
Input
Output
Feedthrough
Cooling
Base
Air Socket - VHF
Air Socket - dc to HF
Length
Diameter
Weight
20,000 Watts
450 Watts
200 Watts
110 MHz
6.7
Thoriated Tungsten
10.0 Volts
140 Amps
Grounded Cathode
195 pf
22.7 pf
0.6 pf
Grounded Grid
87.4 pf
23.1 pf
.08 pf
Forced Air
Special, Coaxial
SK-360, Y-291
SK-320
9.84 in; 249.90 mm
7.85 in; 199.95 mm
15.0 lb; 6.8 kg
Class of
Operation
C
C
Type of Service
RF power amplifier
RF power amplifier
Maximum Ratings
Typical Operation
Plate
Voltage
(Volts)
Plate
Current
(Amps)
12,500
5.0
12,500
5.0
Plate
Voltage
(Volts)
Screen
Voltage
(Volts)
Plate
Current
(Amps)
Drive Output
Power Power
(Watts) (kiloWatts)
9,000
800
4.15
360
28.9
11,500
650
3.75
405
33.2
The values listed above represent specified limits for the product and are subject to change. The data should be used for basic
information only. Formal, controlled specifications may be obtained from CPI for use in equipment design.
For information on this and other CPI products, visit our website at: www.cpii.com,
or contact: CPI MPP Division, Eimac Operation, 607 Hansen Way, Palo Alto, CA 94303
telephone: [phone]. fax: [phone] | email: [e-mail]