[hpsdr] I didn't think it would happen again "PING"

[Murray Lang]

Thanks Eric,

By baseband I assume this means I/Q. But what needs to be shifted is the 
carrier, not the modulation. Maybe you have answered that and I just can't 
see it. Apologies if this the case.

Murray - VK6HL

At 10:37 AM 24/08/2006, Eric Blossom wrote:
>On Thu, Aug 24, 2006 at 09:22:30AM +0800, Murray Lang wrote:
> > ***** High Performance Software Defined Radio Discussion List *****
> >
>
> >
> > I have a rudimentary understanding of QSD. My question was really a more
> > specific one: what is the mathematical function applied to I and Q in
> > software that will produce a constant phase shift on the carrier that it
> > modulates? I wasn't really expecting anyone to answer. When I have a 
> better
> > understanding of the math (I'm working on it) then I'll be able to answer
> > it myself. Something doesn't smell right though - something about 
> frequency
> > response of the I/Q output. Anyway, I'll get over it.
>
>You can apply a constant phase shift of theta radians of a complex
>baseband signal by multiplying it by e^(j theta) == cos(theta) + 
>sin(theta) * j

>Eric, K7GNU



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