Expert Electronics SunSDR2 DX

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SunSDR2 DX User Manual

ExpertSDR2 SOFTWARE DESCRIPTION

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.

Quality – 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:

DSE effect cannot be heard in mono phones.

WFM – Wide FM standard:

USA – set this checkbox to listen to WFM stations in the USA or South Korea.

Default - press to return settings to the default state. Each settings category has the Default

button. Press the Default button if you set wrong values and don't like the result.

Expert Electronics SunSDR2 DX - Page 58