MFJ-1789 Rotatable Mini-Dipole
Instruction Manual
7
Note:
When the balun is mounted as shown, the mast size is limited to 1-3/8” diameter maximum.
For a 1-1/2” diameter mast, you must mount the balun directly on the mast below the
fiberglass rod with the additional U-bolt set provided.
7)
Slide the 1-1/8 x 60” aluminum radiator tubes over the center insulator/balun assembly with the
slot on each aluminum tube on the topside of the fiberglass rod/balun assembly. Insert the ¼-20
bolts through the aluminum tube/fiberglass assembly and through the balun lugs. Add the ¼-20
split lock-washers and nuts and tighten securely. See Figure 3.
8)
Slide four hose clamps over each aluminum tube. Slide two hose clamps (one on each aluminum
radiator tube) up against the ¼-20 hardware and clamp the four aluminum stub channel brackets
(two on each radiator) on opposite sides of the aluminum radiator tubes as shown in Figure 4.
Figure 3: Radiator Tube Assembly – Top View
Fiberglass Rod
Balun wire
(2 plcs)
Slot
¼-20 hdwr
(2 plcs)
AL Radiator (2 pcs)
Balun
¼-20 hdwr
(end view)
~3”
~20”
Balun
Figure 4: 6 and 2-meter stub assembly and mounting
~35”
~11”
AL brkt
Fiberglass brkt
Fiberglass brkt
AL brkt
#10 nuts (2),
Lock Washer (1)
#10 nuts (2),
Lock Washer (1)
