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CHP aircraft (ADS-B disabled) apparently caused an RA with inbound Fedex 86 (N851FD, #ABAB90) this evening reported the RA over the radio but indicated no action was required so was likely a "monitor vertical speed" aural warning which matches the geometry (both a/c level, CHP 500ft below)

wouldn't class this as a near miss or really anything particularly noteworthy, i believe both aircraft had each other in sight as ever, visual sep is the way of the nas

CHP flying this late without ADS-B is clever (perhaps unintentionally) because TIS-B only works when there are client aircraft nearby... if there's no traffic (such as late at night), no rebroadcasts are triggered, no TIS-B tracks