Worth bearing in mind that in the majority of cases the source(s) of the passenger's frustration had nothing to do with you but the passenger wants to get something out of their system and you present one of the few available options ! If you stay polite and seem sympathetic then not sure how you can blame yourself if it isnt enough.
Oh and IF probably means intermediate frequency, a radio term. Received signals are converted to an intermediate frequency in a superhet system. An oscillator in the receiver generates a mixing sign to enable the frequency conversion and this oscillator could act as a transmitter if the design is not good. Apropo of what I am not sure.....
Last edited by Mr Optimistic; 1st Apr 2013 at 21:24.