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A new radio spectrometer, CALLISTO, is presented. It is a dual-channelfrequency-agile receiver based on commercially available consumer electronics.Its major characteristic is the low price for hardware and software, and theshort assembly time, both two or more orders of magnitude below existingspectrometers. The instrument is sensitive at the physical limit and extremelystable. The total bandwidth is 825 MHz, and the width of individual channels is300 kHz. A total of 1000 measurements can be made per second. The spectrometeris well suited for solar low-frequency radio observations pertinent to spaceweather research. Five instruments of the type were constructed until now andput into operation at several sites, including Bleien (Zurich) and NRAO (USA).First results in the 45 - 870 MHz range are presented. Some of them wererecorded in a preliminary setup during the time of high solar activity inOctober and November 2003.Comment: Solar Physics, in pres

Callisto – A New Concept for Solar Radio Spectrometers