Got on 10m this afternoon and the band was nice and open. Scanning through the band, i noticed loads of cw signals, but one stood out. It sounded like someone was holding a slide whistle up to an open mic and blowing a cw signal. Nothing i could make out, however. There was about a minute of sending "p" nonstop. This went on for about 15 min. until band conditions and qrm came in and i lost the signal entirely.