Abstract :
An oscillator has been devised which can be continuously tuned over a 2 : 1 frequency range, and which has a stability and spectral purity approaching that of a quartz-crystal oscillator. A Pal glass delay line is used, with a phase detector in a feedback arrangement, to phase-lock a voltage-controlled oscillator between 3 and 6 MHz. The frequency stability is, in the limit, determined only by the phase stability of the delay.
