A high-power microwave oscillator is realized experimentally, employing a r
elativistic traveling-wave tube with a feedback circuit closed by tunable B
ragg waveguide reflectors. A gigawatt-pulse power level is attained in the
oscillator in the 3-cm wavelength range, which is maintained when the carri
er frequency is tuned in a range of about 5%. (C) 2000 MAIK "Nauka/Interper
iodica".