Exit HDSDR to save the changes.
When you restart HDSDR you will be able to tune up to 70.5 MHz with the
SDR4+ receiver.
10 Setting up the RX Input Calibration in HDSDR
Open HDSDR.
Click “Options [F7]”.
Click on “Input Channel Calibration for RX”.
On the receiver test sheet are the results of measurements taken during
receiver commissioning. Move the sliders so that the Amplitude and Phase
values match the values noted on the test sheet.
Click OK.
11 Setting HDSDR for zero IF operation
Setting HDSDR for zero IF operation allows easy tuning of two HDSDR
sessions without having to set frequency offsets each time.
Open HDSDR.
Click “Options [F7]”.
Click on “Misc Options”.
Click on “set LO
Tune Offset”.
←→
Enter 0 as the new offset.
Click OK.
Click “Options [F7]”.
Click on “Misc Options”.
Click on “Tune fixed to ‘LO
Tune Offset”.
←→
12 Setting up two HDSDR sessions with the SDR4++ dual receiver
Open the first HDSDR session.
Click on “Soundcard [F5]”.
In “RX Input (from Radio)” select the USB Audio CODEC for RX1
In “RX Output (to Speaker)” select the corresponding USB Audio CODEC.
Click “OK”
