[KaiserPro]

Squelch adjusts the noise floor, and in modern radios can be automagical. Also there is nought wrong with digital over HF, as other posts will attest.

[bsder]

There are lots of solutions.

But nobody is going to front the money to get it FAA certified so that it can be a required solution given that the most you will sell is 1,000 a year.

This is the real reason why air technology is so far behind. There is no profit in it.