I have added an extra receiver to my QO-100 setup.
In addition to the "normal" (knob-tunable) receiver I now have a RTL-SDR connected to the LNB IF output, too.
Being able to see the whole spectrum of the narrow band transponder makes finding signals a lot easier. I know that there a re web-SDRs that can be used for that, but I like being independent on the Internet when working with radio. Receiving signals via a web-SDR is cheating to me ;). Until I get a better, more stable and accurate reference frequency, I do find the web-SDR a good tool to get my TX signal on a pre-defined frequency, though.
Also, I now have a constant overview of what is going on on the NB transponder.
When the weather gets warmer, and it gets easier to meet up, I expect to improve the receive set-up, so DATV reception on the satellite should be possible. But DATV is for later. Also, if I want to transmit
DATV on QO-100, I will need quite a bit of power output, and a better feed antenna for my 110cm dish.