6. BALUN
INSTALLATION
Before installing the balun, thread a 3/8” SEAL NUT all the way onto both connectors, with the black
Neoprene face of the nuts facing out. Attach balun to the Block and tighten the connectors
gently
using a
7/16" end wrench. Once the connectors are tight, back the Seal Nuts out and finger-tighten firmly up against
the face of the connectors (or tighten
gently
with 1/2” end wrench). A lot of torque is unnecessary. Form the
balun close to the boom and secure to boom with a nylon cable tie. Tie should be snug but not crushing or
kinking the coax.
7. SHORTING
BAR
INSTALLATION
Install the 8-32 x 1/4” set screws (internal Allen head - tool supplied) into the SHORTING BARS. Slide the
bars onto the 3/16” driven element tips mounted through the boom and then onto the 1/4” rod of the “T”
match assembly. Position the Shorting Bars at
1-3/8”
from the outer edge of the “ T” match block to the
inner edge of the Shorting Bar. See Dimension Sheet. NO SWR ADJUSTMENT should be necessary for a
nearly perfect match at 144.2 MHz but adjusting these bars should allow you some optimization if you care
to place the minimum SWR somewhere within your antenna’s specified operating bandwidth. Align the bars
and rods with each other and tighten the setscrews.
8. BOOM TO MAST PLATE AND CENTER OF ROTATION
If you followed step 2 earlier, re-orient the BOOM TO MAST PLATE perpendicular to the elements and
relocate along the boom at or near the physical balance point of the antenna, which should be about 24”
from the first element on the front side of the center most boom section. You can also determine this
location simply by picking the antenna up. Re-tighten the boom to mast plate to the boom. 2” U-bolts are
supplied for attaching the plate to your mast.
9. INSTALLATION OF EYEBOLTS
See the Dimension Sheet for the eyebolt hole locations. Install the two 5/16 x 4 “ EYEBOLTS in the boom.
Use 5/16 stainless nuts and lockwashers to secure.
10. OVERHEAD GUY SYSTEM
Unscrew the turnbuckle eyes / hooks until only a thread or two shows inside the turnbuckle body. Install the
two turnbuckles into the two bottom U-bolt holes (closest to the boom). Uncoil DACRON ROPE. Secure one
end to the rear eyebolt, taking two turns through the eyebolt, then adding three TIGHT half-hitches. Pull hard
on cord to set the knots. Repeat for the front eyebolt. Cut excess lengths from cord, leaving 2” to 4”. To
prevent fraying melt ends with heat or flame and tape back to main line. Equalize cord length at turnbuckle
plate and cut. Put two turns trough rear turnbuckle eye, pull slack out of rope, and add three TIGHT half-
hitches. Repeat for front cord section. Seal and tape cord ends. Both cords should now be fairly taut and
parallel with boom.
Supplied with this kit is a vertical support tube (VERTICAL RISER). You have the option to attach the
Summary of Contents for 2M8WL
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