  We have collected pulsar flux density observations and compiled spectra of
281 objects. The database of Lorimer et al. (\cite{lorimer}) has been extended
to frequencies higher than 1.4 GHz and lower than 300 MHz. Our results show
that above 100 MHz the spectra of the majority of pulsars can be described by a
simple power law with average value of spectral index $<\alpha> = -1.8\pm0.2$.
A rigorous analysis of spectral fitting revealed only about 5% of spectra which
can be modelled by the two power law. Thus, it seems that single power law is a
rule and the two power law spectrum is a rather rare exception, of an unknown
origin, to this rule. We have recognized a small number of pulsars with almost
flat spectrum ($\alpha \geq -1.0$) in the wide frequency range (from 300 MHz to
20 GHz) as well as few pulsars with a turn-over at unusually high frequency
($\sim$~1 GHz).

Astrophysics