Dear OM Fred,
You ask which K3 roofing filters are optimal to start with. In my humble opinion, the answers you get will be very subjective. They will depend a lot on the particular types of operating that the respondents do, and their particular past experiences with filters and radios they have used. Of course, since the K3 is not yet out, nobody can really say anything definitive.
For what its worth, here is what I did. I ordered my K3/100 with just the stock 2.7 khz SSB filter, and being mostly a CW guy, the 5-pole 500 hz filter. Why the 500 hz and not the narrower ones for CW? It is just personal preference. I have owned several radios in the past, in which I had installed both the available 500 hz and 250 hz filters. I found that I hardly ever used the 250 hz filters with those radios. I just didn't like how the radios sounded with them.
As another example, in my two K2s the filters are set upfor 1 khz, 700 hz, 400 hz, and 200 hz. However, ninety-nine percent of the time, I use them at 700 hz.
Others on the list may have different experiences/opinions. But in the end, it comes down to a matter of personal preference.
Happilly, Elecraft offeres us a lot of choices. I can always add a narrower (or wider) filter later on to deal with special situations, should they arise. And I will read with interest about the experiences/opinions of my fellow Elecrafters on this reflector once the K3 is out.
Hope this helps.
73,
John, W2GW
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