4CX20-000C Datasheet, PDF (1/8 Pages) Communications & Power Industries, Inc. – RF power amplifier

RADIAL BEAM POWER
TETRODE 4CX20,000C
The EIMAC 4CX20,000C is a ceramic/metal power
tetrode intended for use as a VHF power amplifier.
It features a type of internal mechanical structure
which results in high rf operating efficiency. Low
rf losses in this structure permit operation at full
ratings to 110 MHz.
The 4CX20,000C provides high gain in FM broad-
cast service and is also recommended for rf linear
power amplifier service. The anode is rated for 20
kilowatts of dissipation with forced-air cooling and
incorporates a compact, highly efficient cooler of
new design.
Characteristics¹
ELECTRICAL
Filament: Thoriated Tungsten Mesh
Voltage
10.0± 0.5 V
Current at 10.0 Volts
140 A
Amplification Factor, Average, Grid to Screen 6.7
Direct Interelectrode Capacitances (grounded cathode)²
Cin
195 pF
Cout
22.7 pF
Cgp
0.6 pF
Direct Interelectrode Capacitances (grounded grid and screen)²
Cin
87.4 pF
Cout
23.1 pF
C_PK
Maximum Frequency for Full Ratings (CW)
0.08 pF
110 MHz
MECHANICAL:
Maximum Overall Dimensions:
Length
9.84 in; 249.9 mm
Diameter
8.86 in; 225.0 mm
Net Weight
20.0 lbs. 9.06 kg
Operating Position
Vertical, Base Up or Down
Maximum Operating Temperature:
Ceramic/Metal Seals
250° C
Anode Core
250° C
Cooling
Forced Air
Base
Special, Coaxial
Recommended Socket for VHF
Eimac SK-360
Recommended Socket for dc to HF
Eimac SK-320
Available Anode contact Connector Clip
Eimac ACC-3
1 _{Characteristics and operating values are based upon performance tests.}
2 _{In shielded fixture.}
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, Eimac Operation, 607 Hansen Way, Palo Alto, CA 94303
telephone: [phone]. fax: [phone] | email: [e-mail]
July 2011
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