Atec 75A250 User Manual
Phone 215-723-8181•FAX 215-723-5688
MODEL 75A250
160 School House Road, Souderton, PA 18964-9990 USA
75 WATTS CW
10 kHz - 250 MHz
with Versions M1-M4
The Model 75A250 amplifier is a self-contained, broadband 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. The Model 75A250, when used with an RF
sweep generator, will provide a minimum of 75 watts of swept power.
The Model 75A250 includes a front panel control which permits the operator to conveniently set
the amplifier's desired output level. Housed in a stylish contemporary enclosure, the Model
75A250 provides readily available RF power for typical applications such as RF susceptibility
testing, antenna and component testing, watt meter calibration, and use as a driver for higher
power amplifiers.
The 75A250 utilizes a switching power supply with a universal, autoranging input which will
automatically accept from 90 to 135 VAC or from 180 to 270 VAC at 47 to 63 Hz.
120
100
80
60
WATTS
40
20
0
0.001
75A250 TYPICAL POWER OUTPUT
0.01 0.1
CW
LINEAR @ 1dB COMPRESSION
1 10 100 1000
FREQUENCY (MHz)
REV112597
SPECIFICATIONS
Model 75A250
POWER OUTPUT, CW
Nominal.......................................................................................100 watts
Minimum.....................................................................................75 watts
Linear @ 1dB compression.......................................................50 watts minimum
FLATNESS.....................................................................................± 1.0 dB maximum
FREQUENCY RESPONSE...........................................................10 kHz - 250 MHz instantaneously
INPUT FOR RATED OUTPUT....................................................1.0 milliwatt maximum
GAIN (at maximum setting)..........................................................49 dB minimum (See Model Configurations)
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
THIRD ORDER INTERCEPT POINT..........................................57 dBm typical
PRIMARY POWER........................................................................90-135/180-270 VAC
47 to 63 Hz, single phase 400 watts maximum
RF CONNECTOR (Type)..............................................................Type N female
(Location)........................................................See Model Configurations
COOLING.......................................................................................Forced air (self contained fans)
* See Application Note #27
MODEL CONFIGURATIONS
MODEL
NUMBER
RF CONNECTOR
LOCATION
GAIN
CONTROL
INSTRUMENT
CASE
WEIGHT
75A250 Front Panel Yes Yes 15.9 kg (35.0lb)
75A250M1 Rear Panel Yes No 11.4 kg (25.0lb)
75A250M2 Front Panel No Yes 15.9 kg (35.0lb)
75A250M3 Rear Panel Yes Yes 15.9 kg (35.0lb)
75A250M4 Front Panel Yes No 11.4 kg (25.0lb)
SIZE
(W x H x D)
50.3 x 15.5 x 30.0 cm
19.8 x 6.1 x 11.80 in
48.3 x 13.5 x 29.3 cm
19.0 x 5.3 x 11.5 in
50.3 x 15.5 x 30.0 cm
19.8 x 6.1 x 11.80 in
50.3 x 15.5 x 30.0 cm
19.8 x 6.1 x 11.80 in
48.3 x 13.5 x 29.3 cm
19.0 x 5.3 x 11.5 in
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