[Elecraft] kx3 roofing filter

[Don Wilhelm]

  Larry,

It is not for the K3, it will only work in the KX3.
 From what I can imagine (and it is only MY imagination), it is more 
akin to an active bandpass filter (like an audio filter, but at the high 
end of the audio range) where it filters the 11 kHz IF before the signal 
hits the ADC converter.  That should be almost as effective at reducing 
strong off-frequency signals that are within the receiver passband.  
Wayne did say they were "baseband" filters, so I am extending that 
statement without further detailed knowledge - excuse me if I got it wrong.

The K3 uses crystal filters at the 8 MHz 1st IF, the KX3 roofing filters 
work at the 2nd IF, but should still be quite effective.

73,
Don W3FPR

On 5/26/2011 6:16 PM, Larry Walker wrote:
> Is this "one size does all" roofing filter the one alluded to at the
> beginning of the K3 campaign that would be available at some point down
> the line?
>
> Will it fit the K3 or just KX3?
>