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A new multichannel spectrometer, Phoenix-3, is in operation havingcapabilities to observe solar flare radio emissions in the 0.1 - 5 GHz range atan unprecedented spectral resolution of 61.0 kHz with high sensitivity. Thepresent setup for routine observations allows measuring circular polarization,but requires a data compression to 4096 frequency channels in the 1 - 5 GHzrange and to a temporal resolution of 200 ms. First results are presented bymeans of a well observed event that included narrowband spikes at 350 - 850MHz. Spike bandwidths are found to have a power-law distribution, dropping offbelow a value of 2 MHz for full width at half maximum (FWHM). The narrowestspikes have a FWHM bandwidth less than 0.3 MHz or 0.04% of the centralfrequency. The smallest half-power increase occurs within 0.104 MHz at 443.5MHz, which is close to the predicted natural width of maser emission. Thespectrum of spikes is found to be asymmetric, having an enhanced low-frequencytail. The distribution of the total spike flux is approximately an exponential.

High Spectral Resolution Observation of Decimetric Radio Spikes Emitted by Solar Flares - First Results of the Phoenix-3 Spectrometer