Hello:

Re commercial aero. usage:

Saw this on a link:

"Aeronautical SSB Frequencies
Aircraft crossing the Atlantic still use SSB to communicate with the
National Air Traffic Service (NATS) in Shannon, Ireland and..."

I thought that all commercial aero. stuff was always just plain AM.

Can someone please explain when (and if) SSB is used rather than plain AM
for commercial air communications for
air to ground, and vice versa ?

Or, is this a very out of date link, perhaps ?

Thanks,
Bob

Robert11 wrote:
Can someone please explain when (and if) SSB is used rather than plain AM
for commercial air communications for
air to ground, and vice versa ?

VHF air band is AM. Long distance communication (HF) to aircraft is USB.

Geoff.


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Geoffrey S. Mendelson, Jerusalem, Israel N3OWJ/4X1GM
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Do a search for, Key Brothers Meridian Mississippi VHF

That is where (and when,in 1935) Very High Frequency was first used.
Old Terminal Building,Hanger and Powerhouse at Key Field.
cuhulin