[Elecraft] 250 HZ XFIL QUESTION

[n4lq]

Mark
Why did you put that 250hz filter in slot 5 then select filter 2?
Steve Ellington
N4LQ at insightbb.com
----- Original Message ----- 
From: "Mark" <m2steven at bellsouth.net>
To: <elecraft at mailman.qth.net>
Sent: Monday, June 23, 2008 8:42 PM
Subject: [Elecraft] 250 HZ XFIL QUESTION


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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