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PTT延迟，是指本电台接收到PTT按下的指令后的响应时间。
当FT8CN发送PTT按下的指令后，往往电台会稍有滞后的响应，设定此时间，是为了电台真正处于发射状态后，FT8CN才发送声音，防止因PTT滞后造成声音无法完全发送。