[600MRG] What would this signal probably be?

[Frank O'Donnell]

While looking at the waterfall in WSJT-X this evening with the receiver 
on 474.200 kHz, I noticed two signals on either side of the 1500 Hz usb 
offset (see attached image).

The signal on the left I know to be JT9, which faded somewhat during the 
middle of its 2-minute cycle.

It's the signal on the right I'm wondering about. I noticed it and 
several more like it in the course of the evening. Their cycles are 1 
minute long. On the waterfall, they appear wider than a JT9 or WSPR signal.

Can anyone help me with what mode this likely is? My apologies for 
asking a basic newcomer question.

Thanks and 73,

Frank K6FOD


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