I am not able to open the code you posted. Says can't open sketch.
Does this part of the Raduino code make any sense, and help at all?
#define INIT_BFO_FREQ (1199800L)
unsigned long baseTune = ?7100000L;
unsigned long bfo_freq = 11998000L;
LSB: The VFO frequency is subtracted from the BFO. Suppose the BFO is set to exactly 12 MHz
?* and the VFO is at 5 MHz. The output will be at 12.000 - 5.000 ?= 7.000 MHz
