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6M7JHV ASSEMBLY MANUAL
8. Install the main feedline, or a pigtail section just to get to the middle of the boom. Tighten the Male
'N' connector carefully, and route the cable forward on the boom, securing it with the cable ties
provided.
9. Mount the BOOM TO MAST PLATE perpendicular to elements at the physical balance point of the
antenna with the feedline installed. Secure with the 1-1/2" U-bolts, 5/16" stainless steel lockwashers
and nuts. Tighten the U-bolts just enough to prevent the boom from sliding or rotating. Over-tightening
can deform and weaken the boom. . 2" U-bolts are supplied for attaching plate to your mast.
10. Install the 1/4" x 4" EYEBOLTS to the front and rear boom sections, eyes up and parallel with
boom. Secure with 1/4-20 locknuts.
11. To prepare the overhead guy system, begin by temporarily installing a 2" U-bolt through the 2" x 4"
TURNBUCKLE PLATE and into the top set of 2" U-bolt holes on the boom to mast plate. Add a couple
of 5/16" nuts to hold in place. Unscrew turnbuckle eyes / hooks until only a thread or two shows inside
the turnbuckle body and hook to turnbuckle plate.
12. Uncoil KEVLAR CORD. Secure one end to 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. Seal
cord ends with heat (lighter, propane torch, etc) and tape to main length.
13. 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.
14. Both cords should now be fairly taut and parallel with boom. Disconnect the 2" U-bolt securing the
turnbuckle plate and lift the turnbuckle plate up until the boom bows up slightly. This is approximately
how high the plate will need to be mounted on the mast when the antenna is installed.
15. During final installation on the tower / mast, secure the turnbuckle plate at the appropriate height
with the 2" U-bolt. Then lean or pull on the cords to increase the tension and help the knots take their
final "set." Make sure the knots are not slipping. When the guy system has taken a "set", readjust the
turnbuckle plate height until boom is straight and level. Finer adjustments can be made at any time, if
necessary, with the turnbuckles. Safety-wire the turnbuckles to preserve settings.
16. When the antenna is installed in position on the mast, the main feedline can be attached and
sealed at that time. REMEMBER to support the feedline at the antenna boom and on the mast. Leave
an adequate feedline loop for rotation around the tower. When stacking this antenna with other HF
models, maintain a minimum 5' of separation; more if practical. Mount horizontally polarized VHF and
UHF antennas at least 40" above or below this antenna to minimize interaction.
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