[Elecraft] Quick Way To Accurately Measure K3s CW Filter Offset?

[Nr4c]

The 409 is zero. 

Are the passband centered on display?

Sent from my iPhone
...nr4c. bill


> On Feb 18, 2017, at 3:30 AM, Dave AD6A <dave at ad6a.com> wrote:
> 
> Hi Folks,
> 
> 
> 
> I'm having a go at my first CW contest for many years (and boy, am I
> rusty!!).
> 
> I've worked several new countries already, BUT, I noticed my K3s main and
> sub receivers' 400Hz and 200Hz CW filter offsets are all quite a bit off
> (even though I put the offsets in that were written on the filters), causing
> me to tune the stations in at a lower than optimal tone (in order to hear
> them properly) and trying to put in an XIT offset so they can hear me in
> their tight RX passband. So far, it's not working that well. At a rough
> guess, I'd say they were about 200 to 300Hz low of where I need them to be
> (600Hz tone is my chosen optimal listening frequency).
> 
> 
> 
> So, my question is, is there a simple way to accurately determine what the
> frequency offset of each filter is without having to open the rig up and
> dive in with test equipment?
> 
> 
> 
> I'm guessing it could be something like:
> 
> a.    Tune in a strong-ish CW station or carrier to exactly 600Hz audio
> (use the tone mon to compare with the 600Hz reference audibly)
> b.    Note the VFO frequency (on FINE)
> c.    Use the RIT function to tune the station/carrier in to the peak of
> the crystal filter
> d.    Note the offset
> e.    Apply the offset to the crystal filter bank
> 
> 
> 
> What do you think of this procedure?
> 
> Got a better/quicker one?
> 
> Any/all input most gratefully accepted.
> 
> 
> 
> Cheers es 73,
> 
> Dave AD6A
> 
> 
> 
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