Spread spectrum

Right.

Which is why every serious drone program since the 90s has used some form of spread spectrum, because the fixed channel drone is a dead drone the moment somebody turns on a jammer.

And Daniel's instinct.

Hugh's correct.

This is where it stops being a shouting match.

So take the two main techniques.

First, frequency hopping spread spectrum, FHSS.

The transmitter and receiver agree on a sequence, and they hop channels together, synchronized, many times a second.

B, when using a band where the amateur service is secondary.

C, when the station is transmitting spread spectrum emissions.

Or D, all these choices are correct.

Which of the following conditions require a licensed amateur radio operator to take specific steps to avoid harmful interference to other users or facilities? Um, hmm.

Um, w- we're second class citizens on, on some bands, so yeah, you, you wouldn't want to interfere with the military or, or whatever primary user might be there.

So that's two I think are possible.

C, when a station is transmitting spread spectrum emissions.

Yeah, you'd want to take steps so that you weren't, uh, causing harmful interference to others.