An Experimental Study of Regenerative Ultra-Short-Wave Oscillators

This paper gives a quantitative account of operating performance for two representative oscillator circuits, one of single tube type and the other of two-tube balanced type. Wavelength (approximately 3 meters) was measured by two independent methods. Efficiency and stability were measured under various plate, grid and filament voltage conditions. Normal efficiency values ranged from 20 per cent to 40 per cent. Under certain conditions the single tube circuit was more efficient, while under certain other conditions the balanced circuit was more efficient; under most conditions the efficiencies were about equal. In stability the two circuits were about equal; frequency variations were less than 1 per cent, while output variations rarely exceeded 2 per cent.