Overview
The Amplifier Research 20T4G18A is a self contained, forced air cooled, broadband traveling wave tube (TWT) microwave amplifier designed for applications where wide instantaneous bandwidth, high gain and moderate power output are required. A reliable micro TWT provides a conservative 20 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, RF output sample port, auto sleep, 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.
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 20T4G18A 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 alternative packaging and other special features.
20T4G18A TYPICAL POWER OUTPUT
| Specifications | |
| Power (fundamental), CW, @ Output Connector | Nominal : 42 watts Minimum : 20 watts Linear @ 1dB Compression : 10 watts minimum |
| Fatness | ±9 dB maximum, 4.2 - 18 GHz ±5dB maximum, 8.0 - 18 GHz |
| Frequenct Response | 4.2-18 GHz instantaneously |
| Input For Rated Output | 1.0 milliwatt maximum |
| Gain (at maximum setting) | 43 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 20 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. |
| Mobility Capability | Will faithfully reproduce AM, FM, or pulse modulation appearing on the input signal. AM peak envelope power limited to specified power. |
| Noise Power Density | Minus 80 dBm/Hz (maximum) Minus 90 dBm/Hz (typical) |
| Harmonic Distortion (at 20 watts) | 4.2-4.5GHz; Minus 0dBc maximum, Minus 1dBc typical 4.5-5GHz; Minus 1dBc maximum, Minus 2dBc typical 5-7GHz; Minus 2.5dBc maximum, Minus 4dBc typical 7- 10 GHz; Minus 5dBc maximum, Minus 9dBc typical 10 - 12 GHz; Minus 8dBc maximum, Minus 12dBc typical Above 12 GHz; Minus 20dBc maximum, Minus 30dBc typical |
| Primary Power | 99-260 VAC 50/60 Hz single phase, 600 VAC maximumn |
| Connectors | |
| RF input | Type N precision female on rear panel |
| RF output | Type N precision female on rear panel |
| RF output sample port | Type N precision female on rear panel GPIB : IEEE-488-(f) |
| Interlock | DB-15 female on rear panel |
| Cooling | Forced air (self contained fans), air entry and exit in rear. |
| Weight (approximate) | 32 kg, 70 lbs. |
| Size (W x H x D) | 50.3 x 16.5 x 68.6 cm, 19.8 x 6.5 x 27 in., |
