I have been playing with GNU Radio and GRC (GNU Radio Companion) over the weekend and I ended up implementing a very simple CW receiver. This will be very handy on Tuesday when we will be testing the 5.8 GHz UNITEC-1 setup for the first time using the OZ7IGY beacon on 5.76093 GHz. Here is a quick video demo of the receiver where I use my Yaesu FT-817ND to transmit a test signal.
As you can see in the flow graph below it is really simple receiver, yet it has convenient features like variable band pass filter and automatic gain control. It shows how easy it is to implement a CW receiver in GNU Radio.
I used the WBX transceiver board during the demo.