UNID [Spanish] 6790 kHz USB 0315-0323 UTC 16 March 2017

[R4002]

Been listening to a Spanish-speaking OM on 6790 kHz USB for the past 5 minutes or so.  It sounds like he's talking to another station, but no other traffic is heard and there was long pauses between transmissions.  Good signal strength but QRM from nearby data signal on 6791.5 kHz or so is making copy difficult.  I heard a mention of "change frequency?" and "I copy that".  No transmissions heard from 0320 to 0323.  Traffic came back at 0324 UTC, but considerably weaker.  Still only hearing one side of the conversation.

SIO 222 at best. 

[TheRelayStation]

Still only hearing one side of the conversation.

they might be using split-bands.
for example, unit 1 TX is 6790, RX is 6800 - unit 2 TX is 6800, RX is 6790

[R4002]

they might be using split-bands.
for example, unit 1 TX is 6790, RX is 6800 - unit 2 TX is 6800, RX is 6790

That was my conclusion as well.  That, or somebody is running a directional antenna pointed at me and the other guy isn't.  But split frequency operation is entirely possible. 

Glad to hear I'm not the only one listening to these guys