03-20-2012, 07:39 AM
Crotchety Old Bastard
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Join Date: Apr 2005
filters have no affect on sensitivity, they only determine selectivity, a completely different thing altogether.
Would it help in hearing weak signals? They probably could. Are they worth the money? Beats me, that'd be entirely up to you.
From previous experience with Kenwood filters, I think you'd be well advised to skip them and look for an International filter (Inrad, if they make them yet). Huge difference in performance.
All filters attenuate signals to a certain extent. The selectivity off-sets that attenuation to a limited degree. Narrower filters also affect the 'quality'/'tone' of signals. There's a limit to how narrow a filter can be before it get's to be objectionable/noticeable to the listener. It's a personal thing, but 1.8 Khz filters are too narrow for me.