[Elecraft] K3 as a SW receiver

[ab2tc]

Hi,

I use the K3 for AM SWL reception all the time and find it quite capable. I
use the 13kHz FM filter. I don't even have the 6kHz filter. I have no
intention of ever transmitting on AM or for that matter FM. For good strong
AM stations I set the passband from 100Hz to 4.2kHz and enjoy quite good
audio. Yes, I wouldn't mind even a little wider hi cut but once you reach
5kHz whistles form adjacent stations become a problem. Right now I am
monitoring WWV with Spectrum Laboratory on the line output and Heil
headphones on the front panel and clearly see and hear the full spectrum
from 100-4200Hz. WWV has a tone at 100Hz which is clearly audible and
visible (my DSP hardware is unmodified). I don't know how much more you can
ask. Well OK, please get rid of the bugs associated with the passband tuning
and the associated graphic. E.g. the low cut of 200Hz is skipped on the way
up but available on the way down (and others that are well documented).



Joe Subich, W4TV-4 wrote:
> 
> 
>> Also note that our 6-kHz 8-pole filter is targeted specifically 
>> at AM operation, and will provide better adjacent-channel QRM 
>> rejection than the FM filter, if needed. 
> 
> "Targeted specifically at AM operation" is correct only in 
> the context of amateur "communications."  The 6 KHz filter 
> bandwidth limits the audio bandwidth to 3 KHz before the 
> skirt selectivity starts to create significant rolloff.  If 
> one is looking for SW or MW broadcast reception the 13 KHz 
> FM filter would provide significantly better fidelity - 
> particularly if the 4 KHz DSP audio frequency limit was 
> increased to 5.5 or 6.0 KHz (at least for AM).  
> 
> 
> 


-----
AB2TC - Knut
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