I just received a KAF2 audio filter kit for my K2 and I am considering a few mods when I build it, to increase the bandwidth somewhat, and to increase the gain. My use of the K2 is mostly for VHF weak signal work with transverters, often outdoors with lots of background noise (surf, crickets !) so more overall gain would be useful on weak signals, and in HF CW contests where I'd like to get more rejection of signals far off frequency more than I need really narrow bandwidth. I am familiar with the notes from KI6WX on bandwidth and from Elecraft on increasing gain (both referenced in LA3ZA's mods list) and I have the capability to model the circuit and predict frequency response.
Has anyone else tried different variations on the filter bandwidths and if so what are your impressions of the results, and are there any hidden traps in making changes ?
73,
Steve VE3SMA
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