[Elecraft] K3 2.7 k Filter vs. 2.8 k

[K4IA at aol.com]

In a message dated 9/18/2007 4:36:17 P.M.  Eastern Daylight Time, 
w3fpr at embarqmail.com writes:
If the roofing filter is  able to knock down the 
unwanted signal to a level the DSP can handle, then  the DSP will not 
overload and the DSP itself will provide great ultimate  rejection.  

Well, sorta kinda.  If the unwanted signal gets in  and pumps the AGC, then 
the DSP might knock down the signal but won't be able to  do anything about the 
AGC pumping.  Then, you won't hear the signal if it  is weak.  That is the 
whole issue of the DSP being in or out of the AGC  loop and it generated a 
mountain of controversy with the Orion when TT moved the  DSP to within the loop.

I believe I read the K3 did not follow that  mistake but a little 
clarification from the gurus who know a whole lot more  about this issue would be helpful.

Craig  "Buck"
k4ia
Fredericksburg, Virginia USA  




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