Microwave radiation from long in-line Josephson tunnel junctions

The frequency and power of the microwave radiation detected from long in-line Josephson tunnel junctions when dc biased on low order singularities or self-induced steps have been measured as a function of bias current and externally applied magnetic field. The preliminary experimental results reported here show that the magnetic tuning of the emitted radiation may be considerably greater than that obtained in similar junctions of overlap geometry.