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SunSDR2 PRO User Manual
© 2018 Expert Electronics
ExpertSDR2 SOFTWARE DESCRIPTION
APF - Analog peak filter for CW and SSB mode. Provides a more comfortable listening of the
CW signals by amplifying the CW signal in the center of the receive filter (triangle filter's AFC
(amplitude-frequency characteristic) in the filter bandpass).
·
G ain – Analog peak-filter amplifying factor.
·
Qualit y – Analog peak-filter quality (slope sharpness).
·
Frequency – central frequency of the voice signal.
Filt er t aps - receiver's filter taps for SSB, AM/NFM, DIGL/DIGU, CW modes, by default 1537.
The higher the receiver's filter taps value, the more rectangular the filter's shape, but it also
increases the signal pass delay. That is why the user should find the best settings for himself,
between acceptable filter slopes steepness and signal delay. Optimal filter taps are set by
default.
Noise blanker – removes impulse interference. Noise blanker parameters:
·
Threshold NB 1, 2 – filter trigger threshold. Set the required filter 1, 2 trigger thresholds,
depends on the interference level.
Note:
·
NB has a threshold, set it to cut pulse noise if it surpasses the threshold. As a rule, pulse
noise is a high-amplitude and short in time signal, with an amplitude much higher than useful
signal. If it will be cut from the mix of signals the useful signal won't be corrupted. For correct
operation, the threshold level should be adjusted higher than useful signals. In this case, NB
will work perfectly. If the threshold will have the same level as useful signals or lower, the NB
will try to cut useful signals and you'll hear and see distorted signals in phones and spectrum
scope. If noises have white spectrum (not pulse) with low level (lower than useful signals), the
NB cannot be used in this case, use NR.
DSE - Digital Surround Effect for CW signals. Provides a space orientation in stereo phones,
stations from lower frequencies are louder in the left channel, stations from higher frequencies
are louder in the right channel. The signal in the filter's center is equally heard in both channels
of stereo phones.
·
Qualit y – DSE filter quality. The higher the quality value the stronger the function's effect.
·
Swap channels - swap right and left receiver's channels. Set the Swap channels checkbox
for correct DSE functionality, if required. Correct functionality - slowly increasing the receiver
tuning frequency, while receiving the CW signal, sounds as if CW signal moves from the right
to the left channel.
Note:
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