Amplifier Research 75A250A RF Amplifier Used Tested in Good
Conditions
Description of Amplifier Research 75A250A RF Amplifier
The Amplifier Research 75A250A 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. When used with an
RF sweep generator, the 75A250A will provide a minimum of 75 watts
of swept RF output power. The Model 75A250A includes a front panel
RF Gain Control, which permits the operator to conveniently set the
amplifier's desired output level. 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 Model 75A250A 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 75A250A will provide a minimum of 75 watts
of swept RF output power.
The Model 75A250A 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
75A250A 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.
Features
- Frequency: 10 kHz - 250 MHz
- Rated Output Power: 75W
- Gain: 49 dB min
- Noise Figure: 16 dB typical
SPECIFICATIONS, MODEL 75A250A
POWER OUTPUT, CW
Nominal
................................................................100
watts
Minimum
...............................................................75
watts
Linear @ 1 dB 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. *See Application Note #27
MODULATION CAPABILITY
...........................................Will faithfully
reproduce AM, FM, or pulse modulation appearing on
the input signal
NOISE FIGURE (above 1.0 MHz) ....................................16
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
CONNECTORS
RF
..........................................................................Type
N female. See Model Configurations table below for location.
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)
FAQ:
1.Can you ship order to Canada or Australia?
Yes,we can .We send orders worldwide.
2. What delivery method do you use? and delivery time?
We can ship by EMS,DHL,FedEx,UPS,TNT with tracking number. Usual
delivery time is 4-7 workdays.
3. What is your payment term?
100% T/T payment before shipment.
4. How can I ask any other question?
You can contact us online or leave us messages below.
