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Re: AM on existing Satellites?



And if you have a small amount of carrier, perhaps 20dB down on peak 
sideband signal, you can build AFC into your receiver to counteract doppler.


Howie wrote:

>".....old fashioned full carrier double sideband AM has no place on
> existing OSCAR satellites!....."
>
>Agreed... however, I belive many HF rigs generate an "AM equivalent" signal
>by inserting a user adjustable amount of carrier into an SSB transmission.
>This could be an interesting mode for LEO operation where doppler is a
>factor.  Since the carrier reference is transmitted with the modulated
>sideband doppler is tracked, so to speak. Less bandwidth than FM, similar
>power requirements to digital modes, no capture effect to "eliminate" weaker
>uplinks.....or I could be wrong !
>
>Howie AB2S
>
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>
>  
>


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Nigel A. Gunn. 59 Beadlemead, Milton Keynes, MK6 4HF, England. 
Tel +44 (0)1908 604044 or 07774 478270 (mobile)
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