Editing Attack-time delay

{{Short description|Time for a receiver or transmitter to respond to a signal}}
{{Use dmy dates|date=October 2023}}

In [[telecommunications]], '''attack-time delay''' is the time needed for a [[Receiver (radio)|receiver]] or [[transmitter]] to respond to an incoming signal.

For a receiver, the attack-time delay is defined as the [[time interval]] from the instant a [[step function|step]] [[radio-frequency signal]], at a level equal to the receiver's threshold of [[sensitivity (electronics)|sensitivity]], is applied to the receiver input, to the instant when the receiver's output [[amplitude]] reaches 90% of its [[steady state|steady-state value]].<ref name=FS1037C>Federal Standard 1037C</ref> If a [[squelch circuit]] is operating, the receiver attack-time delay includes the time for the receiver to break squelch. 

For a transmitter, the attack-time delay is defined as the interval from the instant the transmitter is [[Keying (telecommunications)|keyed-on]] to the instant the transmitted radio-frequency signal amplitude has increased to a specified level, usually 90% of its key-on steady-state value.<ref name=FS1037C/>  The transmitter attack-time delay excludes the time required for automatic [[antenna (electronics)|antenna]] [[tuner (radio)|tuning]].

==See also==
*[[Transmit-after-receive time delay]]
*[[Receive-after-transmit time delay]]

==References==
{{reflist}}
{{FS1037C MS188}}

[[Category:Telecommunications engineering]]
[[Category:Radio technology]]