6.4 Pulse Cal

This system injects a series of pulses at intervals of 1.0 or 0.2 microseconds, to generate monochromatic, phase-stable tones at frequency intervals of 1 MHz or 5 MHz. The tones are detected currently in the VLBA DiFX correlator, and eventually will be available from the RDBE (Section 6.9). Application of these measurements for phase calibration is discussed in Section 13.2.