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SunSDR2 DX User Manual
© 2020 Expert Electronics
ExpertSDR2 SOFTWARE DESCRIPTION
5.1
Global controls panel
This panel consists of the following buttons:
- the St art button switches on/off the ExpertSDR2 software.
- enable/disable button of the second software receiver (RX2).
- In the RX2 drop-down menu, you can select receiver's window configuration.
RX2 window has the same interface as the RX1.
Note:
·
Two independent software receivers can operate simultaneously only in one Nyquist zone 0-
80 MHz or 80-160 MHz.
·
Even with enabled RX2, BPFs are still controlled by the RX1.
- At t enuat or level can be set via the drop down menu or by successive
presses of the indicator button, which cycles upwards the attenuation coefficient in the following
order: -20dB, -10dB, 0dB, +10dB.
Note:
·
While using Band Pass Filters (BPFs), the attenuator and the preamplifier values are stored
for each filter and each band accordingly. When you use the WideRX filter (LPF) for the whole
Nyquist zone, attenuator/preamplifier level is the same for each band.
·
Attenuator specifics: S-meter values and audio level have program compensation when
you use the attenuator because signal level on the antenna input is always the same and
doesn't depend on the attenuator level. With this solution, a user doesn't need to calculate
real values on his own, every time when the -20 dB attenuator is used. Also, he doesn't need
to adjust AF or RF level every time when the -20 dB attenuator is used, like in most classic
transceivers.
Attenuator influences only the level of the receiving dynamic range, S-meter and audio level
stay the same. If you disconnect antenna you can see how receiver’s noises are changing
when you switch the ATT. Receiver's noise level is lower when you select ATT 0 dB, it means
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