On Sat, 2009-03-28 at 10:34 -1000, Ken Brown wrote:
> >
> > If the 6.3 filter is narrower than the 9 MHz filter then it
> (the 6.3 MHz IF filter)
>
>
> > will set the
> > receiver bandpass and one that is moved over the spectrum passed by the
> > 9 MHz filter until it gets to the edges.
> While the 6.3 MHz IF bandpass is completely within the 9 MHz bandpass,
> the 6.3 MHz filter will set the bandwidth, and the PBT adjustment will
> shift the position of the bandpass. This should be apparent when
> listening to wide band noise or modulation. The "tone" of the audio will
> shift as the PBT is moved.
>
> As the PBT is moved so far that the whole 6.3 MHz bandpass is no longer
> within the 9 MHz bandpass, the following begins to happen
> > Then depending on the direction
> > of offset one filter sets the high side and the other sets the low side.
> >
> >
> Now the PBT is not only changing the position of the passband, it is
> also changing the bandwidth.
>
> DE N6KB
Yes.
73, Jerry, K0CQ
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