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ColibriDDC User Manual
© 2022 Expert Electronics
ExpertSDR2 SOFTWARE DESCRIPTION
- 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 optional BPF-kit, the attenuator and the preamplifier values are stored for each
filter and each band accordingly. When the Low Pass Filter (LPF) is enabled for the whole first
Nyquist zone, its attenuator/preamplifier level is already stored.
·
When you use BPFs along with the RX2, the filters are controlled by the RX1.
·
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 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 that RX sensitivity is
higher, but RX noise level is higher when you use ATT -20 dB, it means that RX sensitivity is
worse. It is done in the hardware.
- enable/disable the wide bandscope in the same Nyquist zone as the RX1, from 0 to 62
MHz or 62-124 MHz or 124-186 MHz and so on up to 800 MHz (BS).
When you use the bandscope, set the Use LPF checkbox in the Options > Device menu, for
better receiving on 0-55 MHz.
The bandscope window can be either adjusted inside the ExpertSDR2 window or can be
displayed as the separate window on the second monitor. Navigation and settings of the
bandscope are similar to the panorama settings of the main receiver.
- enable/disable sound output from the PC's sound card (SC). It doesn't stop sound
output from the front panel, it duplicates output from the PC's sound card.
- enable/disable button of the frequency memory panel (MEM).