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无线信号收发选择什么样的频率更稳定，穿透力强（墙、钢铁之类），避免干扰，在电磁波嘈杂的环境下。
低频段，常用如315MHz，434MHz。在避免干扰，强干扰条件下，建议选用选择性较好的IC。如TI的最新一颗sub-1GHz的芯片CC1120。
