Originally Posted by
The AvgasDinosaur
I admit I don’t know I wasn’t there.i believe the Airbus crew were actually monitoring closely ‘civil guard’ Their aircraft was not equipped to monitor military guard.
As I understood the situation.
Be lucky
David
About 50 years or so ago I was taught that 121.5 being a half frequency of 243 was a design feature in the hopes that an emergency transmission harmonic would break through. These days, with filters etc. that might not happen.