[Elecraft] 250 HZ XFIL QUESTION

[N5EAT]

Thanks for the emails I received concerning the egregious error in thinking I
made.  Basically - since I was installing my second filter I configured
filter slot 2 instead of the correct slot.  Sometimes one reads what one is
expecting instead of what's on the page......


N5EAT wrote:
> 
> The below applies to cw mode only at this time.
> 
> I have a basic K3 2.7hz 100 watt unit.  Tonite I added an 8 pole 250 hz
> filter.  After
> installation and software setup it appears that the filter does not work
> when I select
> filter 2.  The radio was purchased assembled and the 2.7 hz filter is in
> slot one and
> i placed the 250hz filter in slot 5.
> 
> However - if I select Dual Passband - the filter appears to work. The
> display shows both
> filter skirts and the bandwidth of the received signal is obviously
> isolated by the narrow setting.
> 
> My questions are these:  Do I have to use dual passband to use the 2nd
> filter?  Does dual passband use some combination of main filter (2.7) and
> 250hz DSP filtering instead of passing the signal thru the first crystal
> filter and then the 250 hz crystal filter?  If I have the
> K3 software setup correctly - if I select the 2nd filter - does this
> bypass the 2.7 hz filter and use the 2nd filter; and if so,  why would it
> appear that my 250 hz filter is not passing a signal in this mode while it
> appears that it's passing it in Dual Passband mode.
> 
> I'm aware that i've probably phrased my questions incomprehensibly, but
> I'm just wondering
> if i'm getting any use out of my 2nd 250hz crystal, or if it's not working
> because of some software setup error i've made or whether it's defective.
> 
> Thanks - Mark (N5EAT)
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