[Elecraft] Filters for K3

[Don Wilhelm]

Al,

As has been pointed out - the K3 does it a bit differently because you 
can control both the width and the shift.
For the K3, the width remains constant (whatever you set it at), and the 
shift moves that entire passband higher or lower.
In the K3 it is no as you describe, but for transceivers with fixed 
width filters (and Pre-DSP filters), the way you described it is how 
they work

73,
Don W3FPR

Al Lorona wrote:
>> It depends entirely on which brand of radio you were using 
>> and how the manufacturer implemented IF shift and/or width. 
>>     
>
> Originally, IF shift was defined as moving one IF passband within another IF passband, making the resulting passband the intersection (not the union) of the two passbands.
>
> When  you do that, you effectively reduce the width *and* the center frequency of the IF passband... it has nothing to do with manufacturers failing to make it work correctly.
>
> Take two pieces of paper and cut a square in each. Hold them up to a window, and slide one square horizontally across the other one, and note how the width *and* center of the opening shifts left or right. This is what I mean when I say, "IF shift". We might be talking about two different things.
>
> Regards,
>
> Al W6LX
>   
>