Originally Posted by
magpienja
Thankyou Sir.....can you remember...did they have a separate Antenna Tuner ATU....I remember a tuning sound often heard on the frequency.
I suspect todays HF kit has auto antenna tuning.
Most modern airliners still have a separate ATU and this is normally placed as close to the antenna as possible, which can be a bit of a pain when they fail. On the Boeing 777, for example the ATU is located high up on the fin behind an 'access panel' [well that's what Boeing call it....I would just say it is a normal non-structural panel] and it is definitely not 'quick access' as it has about 250+ countersunk screws in in that have to be removed to get the panel off before you can access the [two] ATUs that are at the top of the fin.