Tektronix Encore

Amplifier Research 20T4G18A
Microwave Amplifier, 4.2 - 18 GHz, 20W

Amplifiers - RF and Microwave >> Above 1 GHz and 1000 Watt or More >> Microwave Amplifier, 4.2 - 18 GHz, 20W
Rent Used Test Equipment
Manufacturer: Amplifier Research
Model: 20T4G18A

Amplifier Research 20T4G18A Microwave Amplifier, 4.2 - 18 GHz, 20W

Electronic Test and Measurement Equipment

Amplifier Research 20T4G18A Microwave Amplifier, 4.2 - 18 GHz, 20W Product Datasheet Download Product Datasheet

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Product Overview

Rent of the Amplifier Research 20T4G18A TWT Amplifier (Call for Availability):


The Model 20T4G18A 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 micro TWT provides a conservative 20 watts minimum at the amplifier output connector. Stated power specifications are at 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, 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 reduction. Housed in a stylish contemporary cabinet this unit is designed for benchtop use but can be removed from the cabinet for rack mounting. The Model 20T4G18A 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. 


Functions and Specifications of the Amplifier Research 20T4G18A TWT Amplifier Includes:



Nominal: 42 watts

Minimum: 20 watts

Linear @ 1dB Compression: 10 watts minimum


FLATNESS: ±9 dB maximum, 4.2 - 18 GHz ±5dB maximum,

8.0 - 18 GHz


FREQUENCY RESPONSE: 4.2-18 GHz instantaneously



INPUT FOR RATED OUTPUT: 1.0 milliwatt maximum


GAIN (at maximum setting): 43 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 20 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.


NOISE POWER DENSITY: Minus 80 dBm/Hz (maximum)

Minus 90 dBm/Hz (typical) 10 - 12 GHz;

Minus 8dBc maximum,

Minus 12dBc typical Above 12 GHz;

Minus 20dBc maximum,

Minus 30dBc typical


PRIMARY POWER: 99-260 VAC, 50/60 Hz single phase, 

600 VAC maximumn



RF input: Type N precision female on rear panel

RF output: Type N precision female on rear panel

RF output sample port: Type N precision female

on rear panel

GPIB: IEEE-488-(f)

Interlock: DB-15 female on rear panel


COOLING: Forced air (self contained fans), air entry

and exit in rear.


WEIGHT (approximate): 32 kg, 70 lbs.

SIZE (W x H x D): 50.3 x 16.5 x 68.6 cm,

19.8 x 6.5 x 27 in.,



Working with Axiom has always been fruitful and painless.  So thank you.  You’re always my first call when I need something.  

-- Ed C
Fremont, CA

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Warranty & Support
Comprehensive Parts and Labor warranty on all equipment sold. Includes a user manual, is fully accessorized, and tested to manufacturer specifications prior to shipment.


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Jim P.
New Mexico

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