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The picture is conclusive, radio transmission can be edited very easily. As mention by Bojan radio recordings are captured in one location so in real terms there will be no delay in one direction but 2 seconds delay in the other. Radio waves do travel at the speed of light or near enough to it, but to be realistic any audio captured would need to be listened to live. From that time on the radio traffic can be so easily edited, silence is not what people want to hear so a lot of the delays would have been easily cut. It is also now very easy to blend noise now. I have done this with a high level audio editing tools.
I would first like to listen to these recording, I could most probably determine they are true or not as my first 16 years of technical work was with HF, VHF, UHF 2 way radio communications before going into satelitte/microwave radio.
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