How to determine QPSK slopes?

[mcandre]

I get some data back from the PO-32 Tonic backup signal with a dumb BPSK decoder. However, people online are saying that the signal resembles a QPSK. I think I can adjust my rouge program to do this. But I am not sure how to determine the slopes for the QPSK 00, 01, 10, 11 bit code.

Just trial and error?

[punji]

Some previous discussions on that:

PO-32 Transfer data without microtonic?

Looking at an old (v2) microtonic preset (mtdp, if anyone has a v3 preset, i'd love if you sent me one). If all the numbers inside were 32-bit floats, a patch would fit inside about 80 bytes. *Could be* 1200bps but that would be a little too slow to transfer 16 sounds and patterns as in the other video. 2400? Compressed? Anyway, below is a crop of TE's photo of Magnus Lidström's desktop, showing "DPSKModem" and "FSKModem" .h/.cpp and some "PocketRhinoEngine" parameters.. [magnus_srcx]

Have you tried to visually inspect the signal to get a feeling for the modulation type?