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What’s the range on 13 MHz like, if for example I use SSB AM with a 5kHz response? It’s mostly voice, with some music in which the fundamentals shouldn’t be above 4.25 kHz (theoretically high C on a piano is approx 4186.009 Hz, but I like to sample a little above that to account for stretch tuning on the piano (where to have the piano sound in tune with itself (because of string inharmonicity – btw I’m a piano tuner) you have to tune the high treble a little bit sharp of the mathematical theoretical pitches), and some pianos having the high treble tuned excessively sharp, like as much as maybe a note or something like that) or so. (the music is mostly vocals and piano, sometimes acoustic guitar.)
Also, what’s the general guideline for exposure to high transmitter powers / RF fields at VLF and below (< 9kHz, which the FCC doesn’t have allocated)? I understand groundwave losses are EXTREMELY slow at that frequency, and like I said above, I don’t need CD-quality frequency response, but I DEFINITELY want up to at LEAST 4.25kHz (high C on a piano plus a little breathing room explained above) mono. (Stereo would be nice, but frequency response is more important so I’ll give up stereo to get frequency response.) I understand there is no specific limitations down there, so I could probably use an antenna around the perimeter of the building or property. I was wondering how much TX power I’d need to have in order to have about a 10dB signal to noise ratio at the farthest normal receiving location I specified (of course this depends on the receiving antenna and radio, but the receiving antenna would probably be only tiny fractions of a wavelength long)?
As for the frequency response (of cell phones and others), I do NOT want any artifacts from having compressed the stream too much. On my prepaid cell phone it’s ok for talking to someone for a few minutes, but is unacceptable for listening to something for a couple hours.