FIELD: electricity.
SUBSTANCE: resonator is intended for measuring rods with radius of inertia 
where R - radius of empty resonator, r1max - maximum allowable radius of rod at given frequency, r - radius of the rod being measured. Determination of dielectric permeability of support rods for traveling-wave tubes is carried out using two fixed resonators tuned for the same frequency f0 and detuning Δf0, and two calibration rods with "embracing" measured rods radii of interia S1 of the first resonator and S2 of the second resonator.
EFFECT: relaxation of dither smallness limiting condition of the most sensitive to dielectric losses of dominant TM010-type fluctuations gaging fixed resonator.
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