Re: [Discuss-gnuradio] What's wrong with this constellation?

[Peter Monta]

Hi Mason,

> ... The amplitude of the receiver output seems to spray out pretty 
> widely from the constellation point intended.

It could be an AGC issue---is the AGC time constant long compared with a 
symbol?
Is the distribution of constellation points uniform (each is picked with 
equal
probability)?

One thing you could try, if the channel permits, is to temporarily hold 
the AGC
fixed to see if that gives a better constellation (perhaps at the wrong 
size;
or if you're using decision feedback, try to get it to the right size :-) ).

Cheers,
Peter Monta