MFJ -1775 Instruction Manual page 7

MFJ-1775 Rotatable Mini-Dipole
11) Install the 6-32 screws in all rings of both loading coil assemblies, loosely holding them in place with
their associated nuts. Position the screws so the threaded ends of the screws are pointed outward
towards the two ends of each loading coil assembly as shown in Figure 5. .
NOTE: You can ease your tuning effort by pre-marking the outer ends of the spokes prior
to installation. You can do this by placing 1", 2", and 3" marks on one end of each
spoke using a black permanent marker pen.
sections into ¼" segments using a red permanent marker pen.
NOTE: Install the spokes through the rings until they come in contact with the fiberglass
rod. This will give you about 1/4" of spoke available to slide back out should you
trim too much off a spoke during tuning.
12) Install four short spokes in the 20-meter rings of both loading coil assemblies. With a 5/16" nut
driver, tighten the nuts until the spokes are snug.
13) Install four short spokes in the 15-meter rings of both loading coil assemblies. With a 5/16" nut
driver, tighten the nuts until the spokes are snug.
14) Install four short spokes in the 10-eter rings of both loading coil assemblies. With a 5/16" nut driver,
tighten the nuts until the spokes are snug.
15) Install four medium (see note below) spokes in the 40 meter rings of both loading coil assemblies.
With a 5/16" nut driver, tighten the nuts until the spokes are snug.
Note: One or two of the 40 meter medium spokes on one loading coil only may need to be
replaced with long spokes, depending on the desired 40 meter operating frequency. See
the 40 meter tuning instructions below.
Loosen to slide
AL tube under
the tab
AL tube fits
under this tab
Screw orientation
(4) 12" (4) 12"
spokes spokes
10 M 15 M
coil coil
Figure 5: Loading Coil Assembly
7
Instruction Manual
Then subdivide these marked
(4) 12"
spokes
20 M 40 M
coil coil
(4) 26"
spokes