Überlagerungsempfänger mit Synchrondemodulation für den Zeitzeichenempfang

摘要

The receiver accepts the various international time signal frequencies and converts them into intermediate frequencies which are synchronously demodulated by means of a second mixer (M2) obtaining its signals from a second phase-locked loop (PLL2). This produces a frequency (f2) from a voltage-controlled oscillator delivering two outputs in quadrature. The control signal for the oscillator is obtained from addition of the output of the phase comparator via a loop filter to the weighted part of the control signal supplied by the first loop (PLL1) to the band-pass filter (BP) interconnecting the two mixers.