Unless I am mistaken (entirely possible), all of the K1 band filter boards were essentially the same except for the coils. I'd bet that there are several unused two band K1 filter boards out there ... the result of owners upgrading to the four band module. For example, I have an extra 40m/20m board left over from when I upgraded my K1, but I plan to hang on to mine.
If you can find somebody willing to give theirs up, it shouldn't be too difficult to find the coil winding instructions for the bands you're interested in. There was even a guy who used to wind the coils for a small fee, and if he's still around he probably still has the materials for them.
After all, you don't need a run of boards ... you just need one module. 73, Dave AB7E On 6/10/2019 8:57 AM, Douglas Hagerman via Elecraft wrote:
Apologies in advance if this has been answered before. I can’t find it in the mailing list archives although surely it has come up already. I have recently realized that I “need” a 30 + 17 meter band filter board for my 40 + 20 K1. Obviously I have had 15+ years to make this realization, but I’m slow. After the recent fire sale, it appears that no more K1 parts are available from Elecraft. If they are no longer selling K1 kits, and have therefore apparently given up on the K1 as a profit-making activity, and given that the schematics and BOMs are already in the documentation, is there a source for the circuit board layouts so that third-party boards could be sourced? I suppose the board layout is copyrighted. Or could Elecraft make a run of bare boards? It should not be too hard to collect the required parts if the boards were available. Seems like there could be a small-volume continuing product availability stream somehow… Thanks. Doug, W0UHU.
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