Radio Marconi International 7700 Khz USB-mode Radio Marconi International is on 7700 Khz USB-mode at 1538 Utc with SINPO 24322 at SDR Twente. Share this: Share on X (Opens in new window) X Share on Facebook (Opens in new window) Facebook Email a link to a friend (Opens in new window) Email Print (Opens in new window) Print Related