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SunSDR2 DX User Manual
© 2020 Expert Electronics
ExpertSDR2 SOFTWARE DESCRIPTION
Noise gat e or gat e, removes
signals below Threshold level. Usually it is used to reduce the noise in pauses.
G at e passes signal only when it’s level is higher than set Threshold: gate is open. If the signal
is lower than set Threshold, gate will not pass it (or significantly attenuate): gate is closed.
G at e should be used when the level of the desired signal is higher than the noise level. G at e’s
level is set higher than the noise, so when there is no desired signal (higher than Threshold)
gate is closed. G at e does not cleanse the signal from noises. When the gate is open, both
signals get through, useful signal and noise.
Paramet ers:
Rat io – attenuation value, when G at e is closed. Usually this parameter is set for full rejection,
i.e. signal does not pass through G at e, when it’s closed. But sometimes you might require a
mild rejection in this case adjust Rat io.
Threshold – it sets the level for G at e to open – pass the useful signal. It supposed to be set
above the noise level, but below the useful signal level.
At t ack – it sets time (ms), required for G at e to change state from closed to fully opened. If
At t ack time is short, as soon as the signal level goes higher than Threshold, it creates a sharp
noise, longer At t ack time creates a smooth transition from closed to opened state, but
because of it, you may miss first sharp characters, like T, K.
Release - it sets time (ms), required for G at e to change state from opened to fully closed. If
Release time is short, as soon as the signal level goes lower than Threshold, it creates a
sharp noise, longer Release time creates a smooth transition from opened to closed state, it
may sound like fading.
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