Whining on frequency?
Hi,
Something I've long wondered is why some aircraft's radio transmissions carry with them a distinctive whine?
Its far less common that it once was - but it was very noticeable when a certain Nordic operator's MD82 came on frequency the other day - kind of took me back to the 1980s !
What is it? is it a fault that has developed? or is it a property of poor voltage regulation and bad design on some radios?
Cheers