RT high tone carrier wave on UAL?
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RT high tone carrier wave on UAL?
During the last couple of years while flying, I noticed that all transmissions of United airlines have a distinct carrier wave. Some sort of high monotonous tone in the background. (About 150 hertz).
Why is that? And why only with that airline?
I must say that in the airspace that i work in, all ual flights are wide bodies. (Europe)
If someone knows, i would be delighted.
Why is that? And why only with that airline?
I must say that in the airspace that i work in, all ual flights are wide bodies. (Europe)
If someone knows, i would be delighted.
Join Date: May 2010
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high monotonous tone in the background. (About 150 hertz)
For reference middle C on piano is about 262 Hz.
Google 'middle c' and you will find a link to a site that will play it and other notes in case you don't have perfect pitch
And as to why UAL more than others, perhaps others don't use hand mike above 10,000 and it is more likely to pick up the power 'hum', again pure speculation.
Last edited by MurphyWasRight; 3rd Jul 2017 at 21:30. Reason: Add note on hand mike