[Elecraft] K3: 2.7 v 2.8 filters

[Don Wilhelm]

George,

I don't believe any data that can be trusted has been generated.  About 
all I have heard is reports like yours.  Since the DSP controls the 
width and quality of the transmitted signal much more than the IF 
filter, I would believe that there is little to no difference at all in 
the TX signal.
It is difficult to judge differences in the filters from an on-the-air 
signal unless the same person transmitting has 2 K3s sitting right next 
to each other and uses the same microphone and TX EQ settings while you 
evaluate for any differences in the filters - there are just too many 
other variables involved including propagation variances from 2 
different locations.

Of course, if you are trying to justify a 2.8 filter for your K3 rather 
than the 2.7, then by all means, order the 2.8 if you don't mind 
spending the extra $$$ :-) .

73,
Don W3FPR

George wrote:
> Has anyone done a critical comparison of the 2.7 vs 2.8 as to the quality of transmitted audio??  I participate in a 75 m net which has several K3 owners, and it seems to my somewhat defective ears the 2.8/ 8 pole filter sounds a bit better and is easier to EQ than the 2.7/ 5 pole filter.  
>
> Comments would be welcome.  
>
> thanks, 
> George, n4ym
>   
>