Source: Worked in TV news my whole life, with lots of time in news helicopters. The audio signal is split left and right with the announcer on one and the tel

Source: Worked in TV news my whole life, with lots of time in news helicopters. The audio signal is split left and right with the announcer on one and the telemetry on the other, it's easy to have some telemetry bleed over into the voice channel. The antenna on the helicopter is programmed to always point at any one receive antenna and the receive antenna uses that data to track the helicopter to maintain line-of-sight for the video feed. I believe many use cases of this have migrated to fully digital signal chains so the days of the weird audio may be ending.