Amplifier Research 250T8G18 TWT Amplifier 7.5 GHz – 18 GHz 250W
Description
Amplifier Research 250T8G18 is a self contained, forced air cooled, broadband traveling wave tube (TWT) microwave 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 flange. Stated power specifications are at the 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 IEEE- 488 (GPIB) interface, 0 dBm input, VSWR protection, gain control, RF output sample port, auto sleep, plus monitoring of TWT helix current, cathode voltage, collector voltage, external video pulsing, 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 bench top use, but can be removed from the cabinet for rack mounting.
The Model 250T8G18 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.
Features
- Broadband
- Forced air cooled
- Digital display
- AM, FM or pulse modulation
- IEEE-488 (GPIB) interface
- VSWR protection
- Gain control
- 0 dBm input
- RF output Sample ports
- Auto sleep
Specifications
|
POWER (fundamental), CW, @ OUTPUT FLANGE |
|
|
Nominal |
300 watts |
|
Minimum |
250 watts |
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Linear @ 1dB Compression |
70 watts minimum |
|
FLATNESS |
±12 dB maximum, equalized for ±5 dB maximum rated power |
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FREQUENCY RESPONSE |
7.5-18 GHz instantaneously |
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INPUT FOR RATED OUTPUT |
1.0 milliwatt maximum |
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GAIN (at maximum setting) |
54 dB minimum |
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GAIN ADJUSTMENT (continuous range) |
35 dB minimum |
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INPUT IMPEDANCE |
50 ohms, VSWR 2.0:1 maximum |
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OUTPUT IMPEDANCE |
50 ohms, VSWR 2.5:1 typical |
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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. |
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VIDEO PULSE CAPABILITY |
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|
Pulse Width: |
0.05 microseconds min |
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Pulse Rate (PRF): |
100 kHz max |
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RF Rise and Fall: |
30 ns max (10% to 90%) |
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Delay: |
300 ns max from pulse input to RF 90% |
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Pulse width distortion: |
±30 ns max (50% points of output pulse width compared to 50% points of input pulse width) |
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NOISE POWER DENSITY |
|
|
Pulse On |
Minus 70 dBm/Hz (maximum) Minus 72 dBm/Hz (typical) |
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Pulse off |
Minus 140 dBm/Hz (typical) |
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HARMONIC DISTORTION |
Below 10 GHz, minus 5 dBc max., minus 7 dBc typ. 10-12 GHz, minus 8 dBc max., minus 12 dBc typ. Above 12 GHz, minus 20 dBc max., minus 30 dBc typ. |
|
PRIMARY POWER |
190-260 VAC 50/60 Hz single phase 2.5 kVA maximum |
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CONNECTORS |
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|
RF input |
Type N female on rear panel |
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RF output |
TypeWRD-750D24 waveguide flange on rear panel |
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RF output sample port |
Type N female on rear panel |
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GPIB |
IEEE-488 (f) on rear panel |
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Interlock |
DB-15 female on rear panel |
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Video |
BNC female on rear panel |
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COOLING |
Forced air (self contained fans), air entry and exit in rear. |
|
SIZE (W x H x D) |
50.3 x 29.7 x 68.6 cm, 19.8 x 11.7 x 27 in. |
|
WEIGHT (approximate) |
53 kg, 115 lbs. |
