Northfield-MFJ-998RT

Installation

The bottom of the unit which faces toward the operating position. The ground connection is on the upper left and the antenna wire feeds through a hole on the top edge of mounting frame to its high voltage connection point on the upper right. The square box in the feed line is a Balun Designs 1:1 Isolation Balun (Model 1115u) to keep RF off the coax. The tuner is powered directly through the DC power jack mounted on the tuner itself. If mounted outdoors the unit would use the feed line and the “Bias T” unit. The tuner is held in place by a single screw into the self’s wooden vertical member seen on the black “MFJ” logo side and the bottom edge of the tuner is resting on the shelf itself so that screw is not supporting any of the tuner’s fairly substantial weight. Two small screws are also installed along the bottom edge to hold it securely in place.