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From what I saw of the setup at Nationals, all radio chanels are predefined on a per-station basis, and are tested regularly for proper communication. Each station's Arena Controller was labeled with a specific designated channel (set in dip switches I believe) such that when the OI is plugged in, it's pre-set to a constant channel for that station. All that remains is the activation of the Robot Controller, which scans all frequencies for it's team number, and auto-switches itself to the proper channel it recieves.
There were 5 fields, with 8 stations per field, yielding 40 channels. However, 8 were not in use during qualifications (from Einstein).
I believe they mapped out ahead of time which fields use which channels for which stations (A1, B1, C1, D1, A2, B2, C2, D2).
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