Amplifier Research 75A400 RF Amplifier 10 kHz – 400 MHz 75W

Description

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 Model 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 auto ranging 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.

 

Features

  • Solid state
  • Broadband
  • Air cooled
  • Gain Control
  • Push-pull MOSFET circuitry
  • Mismatch tolerant
  • Modulation capability
  • RF connector – Type N
  • Interface – IEEE-488, RS-232
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Specifications

RATED POWER OUTPUT

75 watts minimum

INPUT FOR RATED OUTPUT

1.0 milliwatt maximum

POWER OUTPUT @ 3dB COMPRESSION

Nominal

100 watts

Minimum

75 watts

POWER OUTPUT @ 1dB COMPRESSION

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

HARMONIC DISTORTION

Minus 20 dBc maximum at 50 watts

THIRD ORDER INTERCEPT POINT

57 dBm typical

PRIMARY POWER

(selected automatically)

90-135, 180-270 VAC

47-63 Hz, single phase

400 watts maximum

REMOTE INTERFACES

IEEE-488, RS-232

CONNECTORS

RF

Type N female on front panel

REMOTE CONTROL

IEEE-488

24 pin female

RS-232

9 pin Subminiature D female

REMOTE INTERLOCK

15 pin subminiature D

COOLING

Forced air (self contained fans)

SIZE (W x H x D)

50.3 x 15.5 x 37.6 cm, 19.8 x 6.1 x 14.8 in.

WEIGHT 

23.4 kg (51.5 lb)

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