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160 School House Road, Souderton, PA 18964-9990 USA
Phone 215-723-8181•FAX 215-723-5688
The Model 250T1G3 is a self contained, forced air cooled, broadband traveling wave tube (TWT) microwave
MODEL 250T1G3
M1, M2
250 WATTS CW
1 - 2.5 GHz
amplifier designed for applications where instantaneous bandwidth and high gain are required. A reliable TWT
provides a conservative 250 watts minimum at the amplifier output connector. Stated power specifications are
at fundamental frequency.
The amplifier's front panel digital display shows forward and reflected output plus extensive system status
information accessed through a series of menus via soft keys. Status indicators include power on, warm-up,
standby, operate, faults, excess reflected power warning and remote. Standard features include a built-in IEEE488 (GPIB) interface, 0dBm input, VSWR protection, gain control, external video pulsing, RF output sample
port, plus monitoring of TWT helix current, cathode voltage, collector voltage, heater current, heater voltage,
baseplate temperature and cabinet temperature.
Modular design of the power supply and RF components allow for easy access and repair. Use of a switching
mode power supply results in significant weight reduction. The external video pulsing feature reduces prime
power use for pulse applications.
Housed in a stylish contemporary cabinet this unit is designed for benchtop use, but can be removed from the
cabinet for rack mounting. The Model 250T1G3 provides readily available RF power for a variety of
applications in Test and Measurement, (including EMC RF susceptibility testing), Industrial and University
Research and Development, and Service applications.
See Model Configuration for packaging alternatives.
250T1G3 TYPICAL POWER OUTPUT
500
400
300
WATTS
200
100
0
0.5 0.7 0.9 1.1 1.3 1.5 1.7 1.9 2.1 2.3 2.5
LINEAR @ 1dB COMPRESSION
CW
FREQUENCY (GHz)
REV121902
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SPECIFICATIONS
Model 250T1G3
POWER (fundamental), CW, @ OUTPUT CONNECTOR
Nominal............................................................................. 300 watts
Minimum........................................................................... 250 watts
Linear @ 1 dB Compression............................................ 100 watts minimum
FLATNESS ..........................................................................±12 dB maximum, equalized for ±5 dB maximum at rated power
FREQUENCY RESPONSE................................................. 1-2.5 GHz instantaneously
INPUT FOR RATED OUTPUT.......................................... 1.0 milliwatt maximum
GAIN (at maximum setting)................................................. 53 dB minimum
GAIN ADJUSTMENT (continuous range)......................... 35 dB minimum
INPUT IMPEDANCE.......................................................... 50 ohms, VSWR 2.0:1 maximum
OUTPUT IMPEDANCE...................................................... 50 ohms, VSWR 2.5:1 typical
MISMATCH TOLERANCE................................................ Output power foldback protection at reflected power exceeding 50 watts
Will operate without damage or oscillation with any magnitude and
phase of source and load impedance. May oscillate with unshielded
open due to coupling to input. Should not be tested with connector off.
MODULATION CAPABILITY........................................... Will faithfully reproduce AM, FM, or pulse modulation appearing on
the input signal. AM peak envelope power limited to specified power.
VIDEO PULSE CAPABILITY
Pulse Width........................................................... 0.05 microseconds min
Pulse Rate (PRF).................................................. 100KHz max
RF Rise and Fall.................................................. 30 ns max (10% to 90%)
Delay..................................................................... 300 ns max from pulse input to RF90%
Pulse width distortion........................................... ± 30 ns max (50% points of output pulse width compared to 50% points of
input pulse width)
NOISE POWER DENSITY (pulse on)................................ Minus 72 dBm/Hz (maximum)
Minus 77 dBm/Hz (typical)
(pulse off).................................. Minus 140 dBm/Hz (typical)
HARMONIC DISTORTION................................................ Minus 3 dBc maximum, Minus 4.5 dBc typical
PRIMARY POWER.............................................................. 190 – 260VAC
50/60 Hz, single phase
2.5 KVA maximum
CONNECTORS
RF input................................................................ Type N female on rear panel
RF output.............................................................. Type N female on rear panel
RF output sample port.......................................... Type N female on rear panel
GPIB..................................................................... IEEE-488 (f)
Interlock................................................................ DB-15 female on rear panel
Video ..................................................................... BNC-female on rear panel
COOLING............................................................................. Forced air (self contained fans), air entry and exit
in rear.
MODEL CONFIGURATIONS
Model Number Description Weight Size (W x H x D)
250T1G3 With removable enclosure 59 kg (130 lb) 50.3 x 29.7 x 76.2 cm
19.8 x 11.7 x 30 in
250T1G3M1 Shipped without an outer cabinet 46 kg (100 lb) 48.3 x 26.7 x 76.2 cm
19.0 x 10.5 x 30 in
250T1G3M2 Enclosure removed for rack mounting - slides and front handles installed 48 kg (105 lb) 48.3 x 26.7 x 76.2 cm
19.0 x 10.5 x 30 in
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