HF aerials
Question from an ancient.....
Remember the long HF wire aerials from just behind the cockpit to the fin?
Like DC-4 or Connie?
Those had to go at some point....
On Concorde they were replaced by two deep "saw-cut" slot aerials in the fin (visible on old photos of Concorde 002, painted over ever since).
Not overly efficient, RF-wise.... the HF currents set up in the surrounding structure were enough to wag the tail via the rate gyros installed in that area.... until we put in some more filters.
Since my long-ago Concorde days I've totally lost contact with present-day HF aeronautical radio systems, but I'm still curious.
Anybody here willing to, very briefly, explain what the HF aerials on, say, an A320 or a B777 are like?