  In this paper, we use jointly a model of narrow band interference and a
congestion model to model and implement an interference simulator for the whole
HF band. The result is a model to generate interfering signals that could be
found in a given frequency allocation, at a given time (past, present, or
future) and for a given location. Our model does not require measurements and
it is characterized by its ease of use and the freedom it offers to choose
scene (modulation, location, week, year, etc.). In addition, we have defined a
generic modulating function and the conditions to model a contact continuous
wave (CW)-Morse, which meets the usual standards of contest. Consequently, our
interference model in conjunction with the CW-Morse modulating function
designed results in a specific CW-Morse model for amateur contests. As an
example of the simulation model, we simulate the CW-Morse communications on the
contest ARR ARRL Field Day 2011.
