Caroline Rainbow 6290 Khz Caroline Rainbow is on 6290 Khz at 1659 Utc with SINPO 24333, Also heard at SDR Twente SINPO 24333 at 1655 Utc. 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