Luckily, there are several online calculators to work out what values of resistor are needed for a given degree of RF attenuation. In the past, I have added attenuators right on the output of my FT817 to get really low power with WSPR on HF bands.
Starting tomorrow, I hope to do some very low ERP tests on 8m locally. Initially, I shall be sending 8m WSPR with my normal power, to make sure locals are looking in the correct place. Later, I am proposing to send 10mW ERP 8m WSPR with a different callsign to see who can still copy me. This should give some idea of what would be possible on the 8m ISM band with very low powered beacons.
Recent OFCOM statements have indicated to me that such operation would be legal without a licence as long as the technical requirements and IR 2030 are met i.e. 10mW ERP at 8m.
If successful, I think many more UK people could legally experiment at 8m on the ISM band albeit with very low power. I know that Jason M0NYW is proposing such tests in his local area. In my view, this is exactly what research is all about. This is not amateur radio, but it is very much radio by amateurs.
Now, I am no legal expert, so you have to decide what the rules indicate.
