6765 kHz USB, 6845 kHz USB and 6910 kHz USB all active in the 1500-1700 UTC time frame, various stations checking in from various agencies, numerous callsign formats heard, some with very very strong SIO 555 signals nice audio. At several points, a carrier appeared on 6845 kHz (and then 6844 kHz), not sure if this was related to the net (a station tuning up, maybe?) or another station testing.