Re: LF: RE: Re: 518khz - Notch Filter.

[Michel F5WK <f5wk@mterrier.net>]

Gary,

You can get more than 80 dB image rejection on a particular frequency with
SpectrumLab. The LO on the capture is precisely 511.500 kHz on a modified
softrock. Please note that you have to exercise great care when adjusting
the I/Q balance and that the antenna input impedance *does* matter.

> I thought I could do the filtering within the SpecLab software but all my
> attempts have had no effect at all, I am not really aware how to manipulate
> the filter controls to do this, if anyone can help with that it could be the
> answer. I will post a query to the SpecLab group.

73,

Michel /f5wk

SLimage rejection.gif
Description: GIF image