B737-700
Flight Crew Last 90 Days 122
Communication Breakdown
Deviation / Discrepancy - Procedural Clearance; Inflight Event / Encounter Wake Vortex Encounter
Flight Crew Became Reoriented
Human Factors
While level at 6000' on the arrival; we received a new frequency on 121.5 and a simultaneous jolt of wake turbulence. It wasn't clear to me which radio the call came from or even if it was for us. The other Pilot (Pilot Flying) asked for a repeat on 121.5 and we eventually called Approach on the new frequency. In the meantime; we were trying to locate the source of the wake encounter. Eventually; we reviewed our COMM panels and found the hundredths digit had been inadvertently moved on our previous frequency.
B737-700 Captain reported losing contact with ATC when they incorrectly entered a new frequency. Situation was complicated by a wake turbulence encounter.