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The Nan\c{c}ay Decameter Array (NDA), which has now passed 40 years old,acquires daily observations of Jovian and Solar low frequency radio emissionsover a continuous spectrum ranging from 10 up to 100MHz, forming the largestdatabase of LW radio observations of these two bodies. It also intermittentlyobserved intense radio sources since its opening in 1977. Before that date,decametric observations were conducted on the same site with an interferometerformed of a pair of log-periodic Yagi antennas mounted on mobile booms. Theseobservations have been recorded with a series of analogic recorders (before1990) and then digital receivers (after 1990), with increasing performances andsensitivities. The NDA scientific team recently retrieved and inventoried thearchives of analogic data (35mm film rolls) covering two decades (1970 to1990). We now plan to digitize those observations, in order to recover theirscientific value and to include them into the currently operational databasecovering a time span starting in 1990 up to now, still adding new files everyday. This modern and interoperable database has virtual observatory interfaces.It is a required element to foster scientific data exploitation, includingJovian and Solar data analysis over long timescales. We present the status ofthis project.

Digitizing analogic spectrograms recorded by the Nan\c{c}ay Decameter Array on 35 mm film rolls from 1970 to 1990