When both JMP1 and JMP2 are "off" or not active, the front panel pre-amplifier switch selects either the internal whip antenna (PRE-AMP ON position of SW4) or the external AUXILIARY ANTENNA (PRE- AMP OFF position). The MFJ-1026 contains internal high-pass filters that begin to roll ...
The wider outside case parts should be glued up from narrower boards; a full-width board may cup over time. Before edge-gluing, clamp each mating pair of boards face to face and handplane the edges to “spring” the joint. Take a short pass along the middle of the edges, then ...