ARRL RTTY Roundup

Contest Objective: Amateurs worldwide contact and exchange QSO information with other amateurs using only the Radioteletype (RTTY) mode on the 80, 40, 20, 15, and 10 meter bands. Any station may work any other station. Stations may be worked once per band, regardless of mode. Automated operation is not permitted, each claimed contact must include contemporaneous direct initiation by the operator on both sides of the contact.   Begins 1800 UTC Saturday, ends 2359 UTC Sunday

Source: http://www.arrl.org/rtty-roundup