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There are a few problems with me using a cell phone to do it.
1. It costs me 10c/minute on T-Mobile’s prepaid service. (and I wouldn’t want to tie up someone else’s phone)
2. the audio quality isn’t good enough. There are too many compression artifacts, and I’m not confident in its ability to pass frequencies above 4.5kHz or below 27 Hz (the minimum range I want).
What about doing something like…
put wireless FM mic on podium, set for open frequency (or use another band if necessary – signal only needs to get outside building maybe 100 or 200 feet clearly) (this would be like a STL)
plug “STL” receiver into audio input of main transmitter outside building, set up antenna. (not sure if directional antennas can be legally used to focus signal so you have maybe more than the F/S limit in one direction (so long as you have less in other directions and it averages out to being at or under the legal F/S limit), and turn the TX and STL on.
at my end, use a fairly sensitive tuner and high-gain highly directional antenna.
Could something like that possibly work? I’m considering using the 13 mHz band, but should I look at 175kHz, 27MHz, or 49MHz instead?
Also, what are the FCC’s rules about using frequencies from 300GHz to above 10^20 Hz?