  The Petrova (2000) model to calculate pulse profiles is extended to a
variable emission height model to make it physically self-consistent. In this
context variable means that the emission height is no longer considered to be
the same for different magnetic field lines. The pulse profiles calculated
using this new model seem to be less realistic due to a focusing effect and
cannot be used to fit (typical) multifrequency pulsar observations. Apart from
the focusing effect the general morphology of pulse profiles is not greatly
affected by introducing a variable emission height. Additional extensions of
the model will be needed to be able to fit observations, and several
suggestions are made.
