[AMRadio] Re: SpaceShip One uses AM


Robert A. Poff wb3awj at blazenet.net
Wed Oct 6 10:34:50 EDT 2004


But of course don't forget that all the ATC over the ocean communications is
SSB.


----- Original Message ----- 
From: "Mahlon Haunschild" <mahlonhaunschild at cox.net>
To: <amradio at mailman.qth.net>
Sent: Wednesday, October 06, 2004 7:05 AM
Subject: [AMRadio] Re: SpaceShip One uses AM


> Fun fact:  All aviation voice communications is AM, albeit VHF.
> SpaceShip One isn't unique.
>
> It's AM because the blocking effect that FM exhibits is considered
> unacceptable.  With AM, if two stations interfere you can usually hear
> both signals to some degree through the heterodyne.  With FM, one
> station would block the other.  The flight safety boffins wouldn't like
> that.
>
> SSB of course would be too labor-intensive for aviation service.
>
> regards,
>
> Mahlon - K4OQ




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