[TenTec] Orion 565 AT Ver2.059

[Grant Youngman]

> With version 2.x firmware 
> the Orion 
> started using an IF AGC detection scheme which has fewer 
> general design 'issues'
> than the AGC derived from audio detection used in version 
> 1.x. Because 
> of this change the notch function must remain outside the AGC loop.

I admit to being slow, but perhaps someone could explain in simple words why
this is the case.  Is it unique to a DSP radio?  Every analog radio I've
ever used that has a "notch" has it INSIDE the AGC loop, somewhere prior to
the point where the AGC control signal is developed.  

Which is the whole point -- that which thou doest notch out shouldst not
affect thine AGC or lower thy receiver gain.

Grant/NQ5T