Receive-after-transmit time delay

In telecommunication, receive-after-transmit time delay is the time interval between (a) the instant of keying off the local transmitter to stop transmitting and (b) the instant the local receiver output has increased to 90% of its steady-state value in response to an rf signal from a distant transmitter.

Note 1: The rf signal from the distant transmitter must exist at the local receiver input prior to, or at the time of, keying off the local transmitter.

Note 2: Receive-after-transmit time delay applies only to half-duplex operation[?].

Source: from Federal Standard 1037C and from MIL-STD-188