[Discuss-gnuradio] QAM receiving and frequency locking.

[Mason]

Hi list,
   So I'm still working on trying to get QAM transmissions between two 
USRPs using the following patch:
http://www.cae.wisc.edu/~masond/gr-qam-patch-rev3.diff

The QAM receiver works in simulation but the constellation just spins 
and spins when sent over the air.
It apparently is unable to cope well with offsets of frequency between 
sender and receiver. Does anyone know either a) better values for the 
'magic numbers' of the receiver to make it track better, (or even a 
source for the selection of the original values) or b) a better receiver 
algorithm to use than the M&M?

--Mason