Observations of pulsar fiux densities have been made at frequencies between 150 and 1612 MHz, with particular emphasis on smoothing out interstellar scintillation. Pulsars are found to be steady in intensity for several hours, but to be highly variable from day to day and month to month. The day-to-day variation is sometimes correlated at 150, 240 and 408 MHz. The flux density spectra fall steeply above 408 MHz but are less steep below 408 MHz. Accurate spectral index measurements between 240 and 408 MHz reveal a correlation between spectral index and luminosity density.