The ARRL RTTY Roundup is on this weekend – for Eastern States that is a 4am Real time Sunday Start
– Rules are similar to the 10M ARRL but a multiplier is only counted once.
Amateurs worldwide contact and exchange QSO information with other amateurs using digital modes (Baudot RTTY, ASCII, AMTOR, PSK31, and Packet—attended operation only) on 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.
RULES ARE FOUND AT http://www.arrl.org/rtty-roundup