[TenTec] PBT function in Omni V, Omni VI and others

[Dr. Gerald N. Johnson]

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