Topband: Echo on 160m yesterday morning

[on7eh]

For the first time, 
I heard my echoes on topband, yesterday morning starting around 05 UTC. 
They lasted for at least 1 hour, with some OFF-periods in between.
I had to quit at 06 UTC. (still 1 hour before surise)

The echoes were loudest on the short Beverages (<60m long) heading N/S and NE/SW and several dB lower on the NW/SE Beverage. (about 130m long).
The Tx setup is modest with Elecraft K3/100 and inv L at 15m height, sloping down to 11m.

Only DX heard that morning was USA (typical condictions) so I wonder what else does hearing echoes indicate?


73,
Michel, ON7EH