The blue sky catastrophe is a typical phenomenon in slow-fast systems. One of the example of slow-fast systems are Hodgkin-Huxley-type of models, which is widely distributed in computational neuroscience. In such kind models the blue sky catastrophe describes a continuous and reversible transition between periodic bursting and tonic spiking activities. In the present paper we present a study of a model of radiophysical generator with bifurcation associated with blue sky catastrophe. Circuit simulation is implemented in the software package MultiSim.