[Discussion] Tuning LW MW HF
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To extend the reception to LW up to now we used different solutions.
Initially a button on the Extio GUI selects LW or HF mode in BBRF103.
In ExtIO_sddc_v1.01 we tried to use the tuning value to switch LWMODE but it is was not straightforward to use.
In ExtIO_RX888 the toggle switch selects Zero-IF
When it is set a half of the spectrum in HDSDR is unused.
This discussion is separated by Optimize r2iq one as it seems more related to the user interface than to the technique used inside the DDC.
I made an experimental branch " Tuning_of_LW_MW_HF " to exercise on this topic.
It is designed and tested with HDSDR.
There is a single mode HFMODE for LW NW HF from near 0 to 30 MHz and no switch in the GUI.
The goal will be also to switch off HDSDR and switch it back up with the exact same layout.
The idea is to upshift the input complex stream by 1 MHz during the ddc tuning.
At this moment the code has bugs in the reference frequency correction, in the sampling rate switching and ....
The experimental branch " Tuning_of_LW_MW_HF " merged to master