  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.
