The vessel with the pestle has the potion with the poison, but the chalice from the palace makes an excellent 70cm antenna. (Sorry, couldn't resist. Yea, verily, yea.).
Any FM signal is too wide for the 2.8 kHz channels, and what would be the point of a 9 watt signal that would take up the entire 15 kHz segment, even if it was allowed? To be demodulated, FM requires a much stronger signal at the receiver than what AM requires.
I don't think that is necessarily true, especially if you factor in the PEP differences of the two modes.
There Still no "Good Operating Practices" for U.S. hams, from any major sources, like the ARRL. So, Let the chaos begin.... ..
Another good question. Where do we measure the Erp power at, the transmitter or the antenna? there was conflicting information about this going back a number of years on 60 meters? They finally settled on 100 watts and dipole.
A NBFM signal achieves 12 db SINAD at 4 dB above the noise floor, an AM signal achieves 10dB SNR with a signal 10dB above the noise floor. An AM signal has a 3dB advantage over a NBFM signal due to to the bandwidth being half as wide. A 12dB SINAD signal on FM sounds somewhat better than a 10 dB SNR on AM. So, an FM signal should sound better at low levels.
In your example, what is the deviation of the NBFM signal? 2.5 kHz?, 5 kHz? This affects the S/N ratio and the minimum discernable signal. Also, you ignored the sidebands on an FM signal when you stated that the bandwidth of an AM signal is half that of an FM signal (Yes, FM does generate sidebands, sometimes lots of them, how many depends upon the modulation index). AM is detectable at much lower signal levels than FM, no matter how 'narrow band' the FM. FM 'sounds better' only when it is strong enough to achieve 'full quieting'. AM vs. FM is not the topic of this thread. I won't debate it any further.
AM bandwidth is about half the bandwidth of a 2.5KHz deviated signal on FM. That is 11.2KHz of FM bandwidth, compared to 6 KHz of AM bandwidth. A 5KHz deviated FM signal has a max bandwidth of around 16KHz. The 5KHz deviation has around a 3dB advantage over the 2.5, although in practical use it's really hard to see a difference.
I can listen to analog FM or a good-sounding AM signal all day long. I tolerate SSB signals mostly depending on the purpose, such as a contest. What I can not tolerate is the offensive sound of digital voice, which assaults my hearing. If you have a different opinion, that's what forums are for.
The quality of digital voice varies greatly. But as a general rule the low bit rate coders, below ~5 kbps, are pretty harsh. Of course higher bit rates require a stronger received signal (Shannon SNR).
Yes. Everything that consumers deal with today is basically digital. Except FM and AM radio. But cellphones use a much higher bandwidth coder (than typical DV voice for hams and commercial), and they sound really good, although the bitrate is still pretty slow compared to the modes that transmit music.
