--- In [email protected], "[EMAIL PROTECTED]" <[EMAIL PROTECTED]>
wrote:
> [snip]
> Ken brought up the question of whether you can notch
> the I and Q signals in the audio chain of a receiver?
> I have had receivers with i.f. notch before and as far
> as I understand the two phase shifted signals you should
> be able to do this.
>
> The two signals although phased 90 degrees from each
> other still are sine wave components of frequency and
> amplitude. Being generated by a transmitter somewheres
> on the airwaves. I see no reason why a notch filter
> would not work in the audio chain of the two port signals
> I and Q.
> [snip]
A hardware notch filter ? Aren't we talking of SDR, i.e. Software
Defined Radios ? A notch filter belongs to the software part of the
radio, and it is not even much difficult to implement. If the software
has already an LMS denoiser (as in SDRadio), it is just matter of some
minor changes and it can be transformed into an automatic, multiple
notch filter...
73 Alberto I2PHD
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