I bought my K3S about 30 months ago and also a 700 Hz roofing filter from Inrad. I have operated nearly 100 % CW for 64 years, and am glad I got this filter. Through the years I have found that something like approximately a 700 Hz filter is very helpful in scanning the bands and for casual QSO’s. However if you are on a budget something like a 1000 Hz or even one of the SSB filters will give your nearly identical performance since the Elecraft DSP filtering is so good. I cut my CW teeth in the old days with wide bandpass receivers and we used our brain filters quite effectively so enjoy a somewhat wider filter so we will be aware of things happening near our operating frequency. Now for sure in contest operating I do often need or want to switch in my 400 Hz filter often. I do agree with IK4EWX that CW sounds SLIGHTLY better (to my ears) with crystal filtering than using mostly DSP filtering, however the difference is small in most situations. So if you are a serious CW operator and have the extra funds you may appreciate the 700 Hz filter, however something like the 500 Hz filter or a wider filter with DSP should be satisfactory for many folks. Rick KL7CW
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