Home › Forums › temp › 15.219 and 15.239 do not specify the modulation scheme to use › Modulation Modes
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The glorious thing about part 15 is we aren’t limited in what mode we can broadcast in.
Remember Part 15 was and is for experimentation. I have always wondered if FM would work well in the medium wave band. FM seems more resiliant to noise, but I am unsure if this is just a characteristic of VHF vs. MW. That being said the NFM broadcasts in the 20mhz area used for STLs sounds fantastic.
That being said, heres the answers to your questions:
SSB on AM reciever: The Classic “wah wah quack”
FM on AM Reciever: Garbled mess, think the Talking House Transmitter’s garble on the fringe.
AM on FM Reciever: White Noise.
Basically on an FM reciever anything recieved not in frequency modulation will just come out as white noise.
“In terms of range per watt, depending on local noise, SSB > AM > FM.”
Actually I’d put this, SSB > Narrow FM > FM > AM. Although in a zero noise environment AM would likely come ahead. Also some law enforecement swear NFM is no where near as good as Wideband FM.