Alan Melia wrote:

Hi Alberto, It occurs to me that to decode correctly we will need to be
listening on upper-sideband otherwise we will get a frequency translation of
the tones and thus an incorrect decode.

Hi Alan,
   no, the coding scheme relies only on the absolute value of the frequency
difference, so it's immaterial whether you are receiving LSB or USB...

Could your failure to decode attributed to the same initial problem of
Dave, i.e. CPU speed of the PC ? Until I produce a version a bit less
CPU-hungry, I reckon you need at least a 500 MHz CPU when receiving.
Dave did succeed when he switched from a 200 MHz PC to a 850 MHz one.

But probably tomorrow I will have ready a slowed-down version...

73  Alberto  I2PHD