E07a missed scheduled transmission on 4577 kHz. It is scheduled at 2240 UTC. I can verify the transmitter was operational, I received traffic from it 60 minutes prior.
This could possibly suggest multiple transmitters aimed at Europe and at North America.
Start: 2220 UTC
End: 2224 UTC
5277 kHz USB
Null with 9 groups of:
825 825 825 000
E07a did not miss the transmission in the time period pointed out. By the way Cherrypie, I think you have done a time conversion wrong, it should have been 2120 UTC, Wednesday, March 8, 2017, on 5277 kHz, not 2220 UTC as you posted. In the 2200 period that day, at 2200, 2220, and 2240 UTC, would be M12 (E07a's Morse code sister station), not E07a.
In March, on Wed / Thu the 2100 time schedule is 2100 UTC on 5877 kHz, 2120 UTC on 5277 kHz, and 2140 UTC on 4577 kHz. The same message, if any, will be sent in each time slot.
However this station, like all of the stations in its related family, will NOT transmit the third transmission if the message is a null. The third time spot, 2140 UTC, will only be used when there is a message.
As noted, the 2100 UTC, 5877 kHz, and the 2120 UTC, 5277 kHz, transmissions were a null, "825 825 825 000". Since there was no message, it was a null, the 2140 UTC TX did not happen.
And that is what the "in case of traffic" means, if there is a message to send, and not a null, the third time period will also be included.
So, no schedule missed, just normal operations for the station.