I use a Datong FL3 audio filter and the difference to my ears is amazing. The K3 sounds a lot lesser hissy and is very "warm" sounding when compared to the unfiltered radio. Yes, I have tried all AGC and EQ settings.The difference can not be equaled by just adjusting the RX EQ or by using a pink noise roll off mask. My Datong FL3 is hooked up permanently to the K3 and I can easily switch it in and out. Anecdotal comments from other hams also confirms the filters efficacy. I have the DSP board upgrade in the K3.
I have perfect hearing, so its not my ears coloring the results. The K3's hiss does have a sharp bite to it that was fixed by using the Datong filter. I know what real hiss is, having owned a TS530S and a FT990 both of which had the worst imaginable IF hiss. When I tried these radio again I could not believe how quiet the K3 really is,,,, however you then use a SDR radio and your perspective of what quiet is changes!
Maybe the K2 SCAF or some other SCAF will do the same job as the Datong. Datongs audio filter has a legendary reputation and its audio peak filter on CW and general filtering qualities leave many DSP radios for dead. Amazing for a 30 year old box!
If you can find a Datong FL3 buy it!
73
Craig
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