Previous comparisons between predicted and observed electric field strengths and volume emissivities in second harmonic type III solar radio emission are improved in two ways. First, the assumption of the head-on approximation in deriving the harmonic emission rate, which is not applicable over the full range of observed type III parameters, is replaced with a more suitable approximation. Secondly, a more realistic functional form for the Langmuir wave spectra is adopted. The revised predicted electric field strengths and volume emissivities are consistent with the observed values.