The wording seemed a tad nebulous to me. Am I safer at 10ms or 15ms tx delay? DElay off on the 7300 is actually ~7ms In order to provide time for the relays to switch safely from receive to transmit, the transceiver should provide a dead time i.e. must “notify” the amplifier in due time by grounding the control KEY IN input not later than 10ms before feeding drive power toward the amplifier RF input. Otherwise, the protection system will read “HOT SWITCHING ATTEMPT” and will trip off.