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

[Eric Blossom]

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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