Regime of a wideband phase-amplitude modulation in a CW magnetron transmitter with a phase control

TL;DR

This paper demonstrates a CW magnetron transmitter with phase control capable of wideband phase-amplitude modulation up to 3 MHz while maintaining a stable carrier frequency, suitable for telecommunication applications.

Contribution

It introduces a model of a magnetron-based transmitter with phase locking that achieves wideband modulation without spectral broadening, verified through experiments.

Findings

Wideband phase-amplitude modulation up to 3 MHz achieved

Carrier frequency remains precisely stable during modulation

Experimental validation of magnetron-based transmitter for telecommunication

Abstract

A model of the CW high-power transmitter, utilizing frequency-locked magnetrons with a phase control studied initially as a prototype of controllable in phase and power an RF source for intensity-frontier superconducting linacs, was considered for telecommunication as a model of magnetron source, acceptable for a wideband phase-amplitude modulation at a precisely stable carrier frequency. The R&D conducted with CW, 2.45 GHz, 1 kW, microwave oven magnetrons demonstrated that the frequency locking of the magnetrons by the phase-modulated signal provides wideband phase and amplitude modulation at the modulating frequency at least up to 3 MHz and large magnitude, keeping the carrier frequency precisely stable, without broadening of the spectral line width. Performed experiments with power combining verified applicability of the transmitter based on the frequency-locked magnetrons for wideband phase and amplitude modulation, which may be used for telecommunication. Results of the experiments are described in the presented work.