Tektronix Encore

Amplifier Research 75A400
RF Amplifier, 10kHz - 400MHz, 75W

Amplifiers - RF and Microwave >> 1 GHz or Less and 100 Watt or Less >> RF Amplifier, 10kHz - 400MHz, 75W
Rent Used Test Equipment
Manufacturer: Amplifier Research
Model: 75A400

Amplifier Research 75A400 RF Amplifier, 10kHz - 400MHz, 75W

Electronic Test and Measurement Equipment

Amplifier Research 75A400 RF Amplifier, 10kHz - 400MHz, 75W Product Datasheet Download Product Datasheet

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Product Overview

Rent Amplifier Research 75A400 Amplifier (Call for availability):


The Amplifier Research 75A400 amplifier is a portable, self-contained, air-cooled, broadband, solid state amplifier unit designed for laboratory applications where instantaneous bandwidth, high gain and moderate power output are required. Utilization of push-pull MOSFET circuitry lowers distortion, improves stability and allows operation into any load impedance without damage. When used with an RF sweep generator, the 75A400 will provide a minimum of 75 watts of swept RF output power.

The Amplifier Research 75A400 includes a front panel RF Gain Control, which permits the operator to conveniently set the amplifier's desired output level. Housed in a stylish contemporary enclosure, the unit provides instantaneous power for typical applications such as RF susceptibility testing, antenna and component testing, Watt-meter calibration and as a driver for higher power amplifiers. The 75A400 is powered by a high efficiency switching supply, with autoranging AC input circuitry which will automatically accept voltages from 90 to 135 VAC, or from 180 to 270 VAC, in the 47 to 63 Hz frequency range. The RF Amplifier stages are protected from over temperature by removing the DC voltage to them if an over temperature condition occurs due to a cooling blockage or fan failure. The digital display on the front panel indicates the operation status and any pending fault conditions when an over temperature or power supply fault has occurred. The unit can be returned to normal operation when the condition has been cleared; as with the other functions, this can be readily accomplished through a front panel switch. The unit also includes digital control for both local and remote control of the amplifier. The 8-bit RISC microprocessor controller board provides IEEE-488 (GPIB) and asynchronous full duplex RS-232 communication control of all amplifier functions.


Functions and Specifications of the Amplifier Research 75A250A Amplifier Include:


RATED POWER OUTPUT: 75 watts minimum


INPUT FOR RATED OUTPUT: 1.0 milliwatt maximum



Nominal: 100 watts

Minimum: 75 watts



Nominal: 75 watts

Minimum: 50 watts


FLATNESS: ± 1.5 dB maximum


FREQUENCY RESPONSE: 10 kHz - 400 MHz instantaneously


GAIN (at maximum setting): 49 dB minimum


GAIN ADJUSTMENT (continuous range): 18 dB minimum


INPUT IMPEDANCE: 50 ohms, VSWR 1.5:1 maximum


OUTPUT IMPEDANCE: 50 ohms, VSWR 2.0:1 maximum


MISMATCH TOLERANCE: 100% of rated power without foldback. Will operate

without damage or oscillation with any magnitude and phase of source and load impedance.


MODULATION CAPABILITY: Will faithfully reproduce AM, FM, or pulse

modulation appearing on the input signal


NOISE FIGURE (above 1.0 MHz): 6 dB typical


HARMONIC DISTORTION: Minus 20 dBc maximum at 50 watts




PRIMARY POWER: .90-135/180-270 VAC 47 to 63 Hz, single phase 400

watts maximum


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