I need pypy to speed up my python code. While the pypy doesn't support a lot of modules I need (e.g. GNU Radio). Could I use pypy to speed up parts of my python code. Could I use pypy to only speed up some of my python files? How can I do that?
No, you can't. You can only have one interpreter instance running all of the code in a single program at a time. The exception is if you break out some of your functionality into a totally separate program that communicates with the other part of your code through some form of inter-process communication; then you can run those totally separate programs however you like. But for code that is not separated like that, it's not possible.
It will probably be more straightforward to adapt the entirety of your code to work with PyPy one way or another, instead of trying to break out bits and pieces. If that's absolutely not possible, then PyPy probably can't help you.
Could pypy speed up parts of my python code?