|[AMRadio] Grandpa's Radio ?|
k4kyv at hotmail.com
Sat Feb 4 13:37:09 EST 2006
>Why does the FAA still use AM? Our aviation industry depends on AM to keep
>our people safe and we have the best safety record in the world. AM should
>be eliminated as some would say ? HUMM.
Because of the capture effect of FM. They don't want a strong signal from
one aircraft to completely block a slightly weaker signal from another.
With AM, despite the QRM, both signals would be heard at the same time,
letting air traffic controllers know there was a second plane. With SSB,
there is too much liklihood one station may be too far off frequency to be
audible at a critical moment.
I have also heard it said that the doppler shift from a jet aircraft running
at full speed is enough to make SSB inaudible due to frequency error. Not
sure if this it true. Anyone know from experience?
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