A Microwave Jet inside the Rosette Nebula

New spectral measurements of the well known HII region Rosette Nebula have been performed with the 32m Medicina (Italy) VLBI single dish [Beamwidth: 5’, beam efficiency: 83%; Tsys ∼ 45K; 1024 channels autocor-relator, bandwith: 12.5MHz, velocity resolution: 0.88Kms-1]. Hydrogen Radio Recombination Lines (RRLs) observations at 8.3 MHz (92α) are useful in attempting to build a non-LTE model for this ring like HII region in order to explain the observed behaviour with frequency of the line to continuum ratio Tl/Tc. Measurements were performed at Celnik’s (1985) positions. Standard spectral fitting and data analysis have led to the values reported in the Table.