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Amplifier Research 40T18G26A
40 Watt CW, 18 - 26.5 GHz TWT Amplifier

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Catalog Description

Amplifier Research 40T18G26A

40 Watt CW, 18 - 26.5 GHz TWT

The AR-40T18G26A is a self contained, forced air cooled, broadband traveling
wave tube (TWT) microwave amplifier designed for applications where wide
instantaneous bandwidth, high gain and moderate power output are required. A
reliable TWT provides a conservative 40 watts minimum at the amplifier output
connector. Stated power specifications are at the fundamental frequency.

The amplifiers front panel digital display shows forward and reflected output
plus extensive system status information accessed through a series of menus
via soft keys. Status indicators include power on, warm-up, standby, operate,
faults, excess reflected power warning and remote. Standard features include a
built-in IEEE-488 (GPIB) interface, 0dBm input,

VSWR protection, gain control, RF output sample port, auto sleep, plus
monitoring of TWT helix current, cathode voltage, collector voltage, heater
current, heater voltage, baseplate temperature and cabinet temperature.
Modular design of the power supply and RF components allow for easy access and
repair. Use of a switching mode power supply results in significant weight

Housed in a stylish contemporary cabinet, the unit is designed for benchtop
use but can be removed from the cabinet for rack mounting. The AR-40T18G26A
provides readily available RF power for a variety of applications in Test and
Measurement, (including EMC RF susceptibility testing), Industrial and
University Research and Development, and Service applications. These
sub-octave amplifiers feature moderate harmonic content.

The export classification for this equipment is EAR99. These commodities,
technology or software are controlled for export in accordance with the U.S.
Export Administration Regulations. Diversion contrary to U.S. law is


Nominal: 45 watts
Minimum: 40 watts
Linear @ 1dB Compression: 10 watts minimum
FLATNESS: 8dB maximum
FREQUENCY RESPONSE: 18-26.5GHz instantaneously
INPUT FOR RATED OUTPUT: 1.0 milliwatt maximum
GAIN (at maximum setting):46dB minimum
GAIN ADJUSTMENT (continuous range):35dB minimum
INPUT IMPEDANCE: 50 ohms, VSWR 2.0:1 maximum
OUTPUT IMPEDANCE: 50 ohms, VSWR 2.5:1 typical
MISMATCH TOLERANCE: Output power foldback protection at reflected power
exceeding 10 watts. Will
operate without damage or oscillation with any magnitude and phase of source
and load impedance. May oscillate with unshielded open due to coupling to
input. Should not be tested with connector off.
MODULATION CAPABILITY:Will faithfully reproduce AM, FM, or pulse modulation
appearing on the input
signal. AM peak envelope power limited to specified power.
Pulse Width: 0.1 microseconds min
Pulse Rate (PRF): 10 kHz max
Duty Cycle: Some restrictions apply. Contact AR with application requirements.
RF Rise and Fall:100 ns max (10% to 90%)
Delay: 500 ns max from pulse input to RF90%
Pulse width distortion: 200 ns max (50% points of output pulse width compared
to 50% points of input
pulse width)
Noise Power Density, (pulse off): Minus 140 dBm/Hz (typical)
Pulse Off Isolation: 80 dB minimum, 90 dB typical
Pulse Input: TTL Level, 50 Ohm nominal termination, high level enables RF when
video pulsing mode is selected.
NOISE POWER DENSITY: Minus 60 dBm/Hz (maximum)
Minus 65 dBm/Hz (typical) See Model Configurations
HARMONIC DISTORTION: Minus 20 dBc maximum
Minus 28 dBc typical
PRIMARY POWER: See Model Configurations
RF input: Type K female on rear panel
RF output: Type WR-42 waveguide flange on rear panel
RF output sample port: Type K female on rear panel
Pulse input (S2V option): Type BNC female on rear panel
GPIB: IEEE-488 on rear panel
Interlock: DB-15 female on rear panel
COOLING: Forced air (self contained fans), air entry and exit in rear

LengthWidthHeightShip Wt
68.58 cm 50.29 cm 16.51 cm 77.27 kg


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