In
telecommunications
Telecommunication is the transmission of information by various types of technologies over wire, radio, optical, or other electromagnetic systems. It has its origin in the desire of humans for communication over a distance greater than that fe ...
, attack-time delay is the time needed for a
receiver or
transmitter
In electronics and telecommunications, a radio transmitter or just transmitter is an electronic device which produces radio waves with an antenna (radio), antenna. The transmitter itself generates a radio frequency alternating current, which i ...
to respond to an incoming signal.
For a receiver, the attack-time delay is defined as the
time interval
Time is the continued sequence of existence and events that occurs in an apparently irreversible succession from the past, through the present, into the future. It is a component quantity of various measurements used to sequence events, to c ...
from the instant a
step
Step(s) or STEP may refer to:
Common meanings
* Stairs#Step, Steps, making a staircase
* Walking
* Dance move
* Military step, or march
** Marching
Arts Films and television
* Steps (TV series), ''Steps'' (TV series), Hong Kong
* Step (film), ' ...
radio-frequency
Radio frequency (RF) is the oscillation rate of an alternating electric current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around to around . This is roughly between the upp ...
(RF)
signal
In signal processing, a signal is a function that conveys information about a phenomenon. Any quantity that can vary over space or time can be used as a signal to share messages between observers. The '' IEEE Transactions on Signal Processing' ...
, at a level equal to the receiver's threshold of
sensitivity, is applied to the receiver input, to the instant when the receiver's output
amplitude
The amplitude of a periodic variable is a measure of its change in a single period (such as time or spatial period). The amplitude of a non-periodic signal is its magnitude compared with a reference value. There are various definitions of amplit ...
reaches 90% of its
steady-state value.
[Federal Standard 1037C] 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
keyed-on to the instant the transmitted RF signal amplitude has increased to a specified level, usually 90% of its key-on steady-state value.
[ The transmitter attack-time delay excludes the time required for automatic ]antenna
Antenna ( antennas or antennae) may refer to:
Science and engineering
* Antenna (radio), also known as an aerial, a transducer designed to transmit or receive electromagnetic (e.g., TV or radio) waves
* Antennae Galaxies, the name of two collid ...
tuning
Tuning can refer to:
Common uses
* Tuning, the process of tuning a tuned amplifier or other electronic component
* Musical tuning, musical systems of tuning, and the act of tuning an instrument or voice
** Guitar tunings
** Piano tuning, adjusti ...
.
See also
* Transmit-after-receive time delay
* Receive-after-transmit time delay
References
{{FS1037C MS188
Telecommunications engineering
Radio technology