e-Callisto network and data archive of RAG, RAPP, ETH Zurich, IRSOL and FHNW Brugg/Windisch, Switzerland Welcome to the archive of several frequency- and FFT- solar radio spectrometers like AOS, Argos, IKARUS, PHOENIX, PHOENIX-2, Phoenix-3 and Callisto. Data access is free for everybody but we would appreciate credit to: University of Applied Sciences and Arts Northwestern Switzerland (FHNW), Institute for Data Science. Adress for co-authoring: Christian Monstein, Istituto Ricerche Solari Locarno (IRSOL), Via Patocchi 57, 6605 Locarno Monti, Switzerland monstein(at)irsol.ch Remark: FIT-files contain the keyword BUNIT in the primary header. If the BUNIT = 'SFU', then data are calibrated. If the BUNIT = 'digits' or 'null' or 'nil', then data are raw data without any intensity calibration.