Amplifier Research 40T18G26A TWT Amplifier 18 GHz – 26.5 GHz 40W

Description

Amplifier Research 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 amplifier’s 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, 0 dBm 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 reduction.

Housed in a stylish contemporary cabinet, the unit is designed for benchtop use but can be removed from the cabinet for rack mounting.
The Model 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.

 

Features

  • Broadband
  • Forced air cooled
  • Digital display
  • AM, FM or pulse modulation
  • IEEE-488 (GPIB) interface
  • VSWR protection
  • Gain control
  • 0 dBm input
  • RF output Sample ports
  • Auto sleep
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Specifications

POWER (fundamental), CW, @ OUTPUT CONNECTOR

Nominal

45 watts

Minimum

40 watts

Linear @ 1dB Compression

10 watts minimum

FLATNESS

±8 dB maximum

FREQUENCY RESPONSE

18-26.5 GHz instantaneously

INPUT FOR RATED OUTPUT

1.0 milliwatt maximum

GAIN (at maximum setting)

46 dB minimum

GAIN ADJUSTMENT (continuous range)

35 dB 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.

VIDEO PULSE CAPABILITY (S2V OPTION)

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 RF 90%

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)

HARMONIC DISTORTION

Minus 20 dBc maximum

Minus 28 dBc typical

PRIMARY POWER

99-260 VAC

50/60 Hz single phase

850 VA maximum

CONNECTORS

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 or 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.

SIZE (W x H x D)

50.3 x 16.5 x 68.6 cm, 19.8 x 6.5 x 27 in.

WEIGHT (approximate)

30 kg, 65 lbs.

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