DTI - Magnetron Modulators and Transmitters
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Diversified Technologies, Inc. (DTI) develops compact, solid-state magnetron transmitters that deliver peak powers of 3 kW, 50 kW, and 1 MW at frequencies ranging from K-band to S-band. These compact, solid-state modulator systems replace many tube-based designs and deliver greater reliability than first generation solid-state systems. The transmitters are built upon new circuit topologies developed at DTI, meeting the magnetron's unique requirements for dV/dt control and constant current operation.
Products Details
The transmitter designs employ direct solid-state, cathode-switched, and hybrid solid-state/transformer-coupled switching topologies. A 'direct-switched' solution, using DTI's compact, highly-regulated high voltage power supply and modulating switch, is a recommended replacement for cathode pulsed, 'hard-tube', active switch modulators, and thyratron switched, line type modulators. A 'hybrid' modulator combines DTI's advanced solid-state switches with a state-of-the-art, dry pulse transformer in a very compact footprint. These designs can deliver pulsed pairs and bursts with extremely good pulse shape and stability for all pulses in a group.
DTI's cathode modulator provides fully variable pulsewidth (50 ns - DC), adjustable on a pulse to pulse basis, and supports pulse repetition frequencies up to 400 kHz. In normal operation, the cathode switch is closed for the duration of the desired pulse, presenting very low impedance between the power supply and the cathode. If fast fall time or operation with closely spaced pulse pairs are required, the system may include a resistive pull down, or a second solid-state switch as an active 'tail biter'.
DTI's K- and Ka-band transmitters utilize a hybrid modulator topology to meet strict size, weight and pulse fidelity specifications. The hybrid circuit uses high speed IGBTs that switch approximately 1000 volts driving a dry pulse transformer. Transmitters are packaged in ruggedized environmental enclosures.
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