Using an old radio and a bicycle-powered generator, Djajakusuma listened to international news broadcasts and wrote them down; the information from these broadcasts was then printed in underground newspapers.
Dengan menggunakan radio tua dan sepeda bertenaga generator, Djajakusuma menyimak siaran berita internasional dan menuliskanya; informasi dari siaran tersebut kemudian dicetak pada surat kabar bawah tanah.