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This appears to be the SFU Telematics research lab, as they are the only license in the TAFL database for the 763/793MHz pair with 10MHz of bandwidth in the area. It could have been their mobile vehicle, or a likely temporary fixed installation on the public safety tower in QE park.

TAFL search showing the pairs.(Internet Archive Link.)

Press release from an industry partner talking about running LTE on B14.(Internet Archive Link.)