Blocking oscillator arrangement gives 0.3 microsec pulse length for recording by time-division multiplexing of S2 channels on two-track video recorder, and 0.8 microsec pulses when S1 is set for playback.-M. H. Damon and F. J. Messina, High-Density Storage of Wideband Analog Data, Electronics, 35:13, p 45-49.