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BlueThunder asked How does the NFL control the use of the helmet radio signal calls?
NFL quarterbacks and now selected defensive players have a radio receiver imbedded in their helmets for hearing play calls from the sidelines. What precautions does the league have to prevent someone using a frequency scanner from listening in and relaying the called play to the other team? And, what precautions does the league have to prevent someone in the stands, or even someone miles away, from flooding the frequencies used for the communications with a much stronger signal?
And got the following answer:
It's pretty simple actually. There's a one-way radio in the QB's (and defensive captian's) helmet. The play is relayed in by the head coach or coordinator to the player on the field. The player on the field has no ability to say anything back to the coaches on the sidelines. The frequencies used differ for each team and are changed for every team, for every game. The NFL has strict rules about who is privy to what these frequencies are. The only people with access to (or knowledge of) the frequencies are the individual teams' field managers, a representative from the NFL Oversight Committee, the designated Replay Official (the one in the booth), and a representative of the New England Patriots coaching staff. That way, the NFL can ensure that there's no possible way that one team can gain a competetive advantage over another.
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