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Old 30th Sep 2017, 10:34 am   #3
Jon_G4MDC
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Join Date: Nov 2015
Location: Welwyn Garden City, Hertfordshire, UK.
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Default Re: Why is aeronautical VHF AM?

Because they want hetorodynes to show that two signals were transmitted at once.
No capture effect.
Simulcast from multiple sites is simpler too.
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