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RaDial BeaM pOWeR tetRODe 4cx25,000c
4cW50,000J
RaDial BeaM pOWeR
tetRODe 4cx25,000c
The EIMAC 4CX25,000C 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 4CX25,000C is recommended for use in In-
Band-on-Channel (IBOC) FM broadcast service
with combined digital and analog components.
The anode is rated for 25 kilowatts of dissipation
with forced-air cooling and incorporates a com-
pact, highly efficient cooler of new design.
chaRacteRistics
1
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
0.08 pF
C
PK
Maximum Frequency for Full Ratings (CW)
110 MHz
MECHANICAL:
Maximum Overall Dimensions:
Length
10.1 in; 256.54 mm
Diameter
8.9 in; 226.0 mm
Net Weight
26.5 lbs. 58.3 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
1
Characteristics and operating values are based upon performance tests.
In shielded fixture.
2
MaxiMuM Ratings
typical OpeRatiOn
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
:
1(800) 414-8823.
fax
:
(650) 592-9988 |
email
:
powergrid@cpii.com
July 2011
1
CPI [ COMMUNICATIONS & POWER INDUSTRIES, INC. ]
