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Re: Geosynchronous Satellites



On Mon, Dec 25, 2000 at 11:35:28PM -0600, Jon Ogden wrote:
> modulated signal.  Phil Karn feels that FM signals, particularly digital
> ones, perform better than AM signals.  My statement was that an AM modulated
> digital signal could be used.  However, digital FM modulation is used in
> subscriber handsets for cellular because you don't need a PA as linear as
> you would for a digital AM signal.  For analog FM, you can use a handset PA
> with typical Class C efficiencies.  For digital signals, you need more

What are "digital AM", "digital FM", "analog FM"? What do these
terms mean, and can you give an example? You've completely lost me
here.

> If we are going to talk engineering and design here, let us talk in the
> technically correct terms.  If a linearized amplifier with about 7%
> efficiency is not capable of amplifying an FM signal then how did Lucent

I don't think anyone disputes than a linear amplifier can cleanly
amplify an FM signal (digital or analogue, whatever that means).



Hamish
-- 
Hamish Moffatt VK3SB <hamish@debian.org> <hamish@cloud.net.au>
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