[Elecraft] KX3 - Filters? Am I missing something or??

[Steve KC8QVO]

I plugged an antenna in to my KX3 this evening for the first time - dead. I
got to playing around with it and cranked the filter wide open and the
receiver came back to life. 

Every time I crank the knob past Fil1 to Fil2 I loose the receiver. I
flipped through the manual and didn't see much pertaining to this. 

I am thinking that the roofing filters are just that - roofing filters. I do
not have them installed. Shouldn't the receiver allow DSP filtering down to
50Hz? I see there are spaces for Fil4 and Fil5 on the display, but mine
don't light up past Fil3 even if I go down to 50Hz. 

Steve, KC8QVO

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