Dear all, In the "Roofing Filter Notes from Wayne and Eric" link on the Order page I see the two sentences: "Add narrower/wider filters as you prefer. I like to use the 1.0 kHz crystal filter when tuning a crowded band or listening to a pile up." Can anyone point me to a place that can tell me what "the 1.0 kHz crystal filter" is, where to obtain one and when it is worth using? Vy 73 OZ1CCM Kjeld
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