I know you have a few of these in your closet/garage and was wondering about the following 85Khz IF info because I use these things: What is the first IF in an R23 receiver ? (R23A is different) 1st ? (2nd is a 9641, 3rd is a 9642) Which receiver uses the following ? (1st IF is a 12011, 2nd IF is a 12012), 3rd IF is a ? 73s Kees K5BCQ