[Elecraft] Filters for K3

[David Gilbert]

I agree that shifting the FC is very important when using narrow filters 
on SSB.  For a while Inrad was selling 1.5 KHz 8-pole filters for really 
narrow SSB and I bought a pair for my K3.  They work great as long as I 
drop the FC down to 1.05 KHz. 

In extreme cases I've even narrowed the DSP filter down to as low as 1.1 
Khz and shifted FC to about 0.95, but that only works for some voices.

Which brings up another observation I've made ... for any given WIDTH, 
the optimum FC for best intelligibility will be different depending upon 
the characteristics of the voice you are trying to copy.  I can go an 
entire contest without changing the WIDTH, but I often adjust the SHIFT 
to dig out a difficult one.

73,
Dave   AB7E




Dave Hachadorian wrote:
>> Before you buy the 1.8, set your DSP to 1.8 and spend some time
>> listening at
>> that width to see if you like it
>>     
> ------------------------------
>
> When you set BW=1.8, set the FC at about 1.05.  That's where most
> people agree that SSB sounds best at that narrow bandwidth.
>
> In practice, the best way to get to that BW and FC is by
> normalizing, then putting the DSP controls into SHIFT/WIDTH mode
> and adjusting only HI CUT. Use only as much HI CUT as the QRM
> conditions require. Thanks to W0YK for that valuable tip.
>
> I use the 1.8 on SSB, but I told the K3 that it was a 2.1, so it
> cuts in when the DSP BW is reduced to 2.1 (by using HI CUT). The
> 1.8 filter sounds great at DSP BW=2.1. DSP BW can be reduced as
> far as 1.5 if necessary, and SSB remains intelligible.
>
> Dave Hachadorian, K6LL
> Yuma, AZ
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