we only see a digital signal 0 1
You should be seeing a digital signal if you're placing a scope probe on GP2. This is a digital
I/O-pin connected to pin #14 DATAask on your tx board. That's your outbound data being
used to control the PA.

Read the data sheet, section 9.4, ASK Modulation and you'll see why an I/O-pin
would be connected to pin #14.

You can find a modulated signal on the antenna output, but you'll be loading it with your
scope probe.