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Radio luminosities have been estimated from published data for a well-definedhomogeneous set of 29 normal pulsars. The radio-frequency energies per unitcharge in the primary accelerated particle beam are given for each pulsar andform a distribution more than two orders of magnitude in width. The valuesfound show that pulsars are extremely efficient generators of radiation below 1- 10 GHz given the kinematic constraints which are obtained here in the casesof electron-positron and ion-proton plasmas. Our conclusion is that only theion-proton plasma source is consistent with the spectra of normal andmillisecond pulsars and we list and describe the factors which together supportthis conclusion.

The mechanism of coherent radio emission in some classes of pulsar