Atec 250L User Manual
Phone 215-723-8181•FAX 215-723-5688
MODEL 250L
circuit. Easily accessible, rear mounted test points and LED indicators provide monitoring of
160 School House Road, Souderton, PA 18964-9990 USA
250 WATTS CW
750 WATTS PULSE
10 kHz - 220 MHz
The Model 250L is a self contained, forced air cooled, broadband amplifier that features instantaneous
bandwidth, high gain and moderate power output. It employs all solid state, MOSFET low power
stages and a vacuum tube final amplifier. To increase its versatility for laboratory applications, both
CW and PULSE modes are provided. All control and protection circuits use solid state logic.
Overload comparators are used in both the CW and PULSE modes to safeguard against overdrive or
excessive pulse lengths. In addition, the final amplifier tubes are protected by a high speed crowbar
operating voltages and currents. Remote control is provided through a rear panel mounted connector.
Isolated TTL level remote control can be accomplished using our CP2001 interface. Isolated IEEE488 compatible control can be provided with our Model CP3000. A continuously variable RF input
attenuator conveniently located on the front panel permits operator adjustment of the output power as
required. The Model 250L is useful in many applications such as RF susceptibility testing, plasma
experiments, ultrasonics, and RF heating.
250L TYPICAL POWER OUTPUT
1200
1000
800
600
WATTS
400
200
0
CW
LINEAR @ 1dB COMPRESSION
0.010.001
0.1
FREQUENCY (MHz)
1 10 100 1000
PULSE
REV072696
SPECIFICATIONS
Model 250L
POWER OUTPUT
Pulse Mode
Minimum...........................................................................750 watts
Duty Cycle..........................................................................10% maximum
Pulse Width........................................................................8 milliseconds maximum
CW Mode
Nominal...............................................................................370 watts
Minimum..............................................................................250 watts
Linear @ 1dB compression................................................150 watts minimum
FLATNESS.....................................................................................± 1.5 dB
FREQUENCY RESPONSE...........................................................10 kHz - 220 MHz instantaneously
INPUT FOR RATED OUTPUT....................................................1.0 milliwatt maximum
GAIN (at maximum setting)..........................................................54dB minimum CW, 59dB minimum Pulse
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............................................................................Noise floor data on request
HARMONIC DISTORTION (at 150 watts).................................Minus 20 dBc average
Below 115 MHz...................................................................Minus 15 dBc maximum
Above 115 MHz...................................................................Minus 25 dBc maximum
THIRD ORDER INTERCEPT POINT..........................................61 dBm typical
GATING CHARACTERISTICS
Pulse Mode Gating / CW Mode Blanking
Signal (into 180 ohms)..................................................Plus or minus 2.5 to 6.0 VDC
Rise time.........................................................................20 microseconds maximum
Fall time ......................................................................... 5 microseconds maximum
RF Rise / Fall Time.............................................................10 nanoseconds maximum
PRIMARY POWER........................................................................100/110/120/200/208/220/240 ± 5% VAC
(select via internal taps) 50/60 Hz, single phase
3700 watts maximum
CONNECTORS
RF Input...............................................................................Type BNC female
RF Output............................................................................Type N female
Gating/Blanking..................................................................Type BNC female
Remote Control...................................................................25 pin female subminiature D
COOLING......................................................................................Forced air (self contained fans)
WEIGHT.........................................................................................84 kg (185 lb)
SIZE (WxHxD)...............................................................................50.3 x 42.7 x 55.1 cm
19.8 x 16.8 x 21.7 in
* See Application Note #27
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