Total posts : 45366
I believe I understand what you wrote and I did not comment on any of it, so I wonder what point I missed. I simply reported on a paper experiment I performed using published FCC data.
You wrote: “The micro power FM broadcasters who get a letter or a visit from the FCC are operators openly and unabashedly violating more than just Part 15 rules.” I believe I allowed for that in my comments about interference and objectionable content, however the citations I used are for exceeding the allowable field strength. I tried, with my study, to demonstrate the very low power levels (calculated) which resulted in actual public record FCC action.
Since I used ERP, the antenna gain is irrelevant in that ERP includes the antenna gain. I also made no claim about the actual transmitter output power other than to state that the ERPs I reported are possible with low milliwatt transmitter output. Pick an antenna gain from -10 dB to 10 dB, which I trust you will accept as a typical and reasonable range for part 15 FM, and the field strength from a 1 mW. transmitter is still above the limit.
If, as you suggest, we should “dumb down” this so we can provide guidance for those who wish to operate legally, then I offer “if you can receive your FM transmission beyond 200 feet on a car radio, then you are exceeding the allowable field strength”. Though this does not directly relate to the numbers, it does represent the intent of the FCC rules as stated in their public notice on the subject.