Who here is experimenting with milliwatt QRP?
I've been transmitting milliwatt and sub-milliwatt WSPR signals from my Hermes Lite 2 SDR by generating low IQ signal levels with customized SDR code. I then measure the Vpp of the Tx output into a dummy load with my oscilloscope to confirm the output wattage.
The WSPR format seems to not have an encoding for Tx levels below 0 dBm, so I have to annotate test signals below 1 mW in my Tx log. So far, I regularly get multiple spots at 0 dBm. But have limited success at -6 dBm and lower, getting only a few spots very occasionally, mostly from contest stations with monster antenna farms. But I'm not only running mW QRP, but only using a simple wire (vertical) antenna.
The standard FT8 frequencies seem to be filled with more and more stations operating QRO and saturating the bandwidth. Is there any organized separate FT8 wateringhole and day for experimenting with milliwatt QRP FT8? Or enough interest to propose one? For example, for CW, there's the NAQCC mW sprint on 12/16.