7. BOOM ASSEMBLY
Wipe off any dirt or grit from the coupling rings on the end of the long 3” section. Also clean the
inside of the 4” x 20 foot section. Lubricate the inside of the 4” tube and the coupling rings lightly
with oil or zinc paste Gently insert the 3” section into the 4” boom section. Align the holes, install
the 13/8-16 x 4-1/2” bolts and locknuts and tighten. Clean the boom tip section and slip it into the
main section. Install the 1/4-20 x 3-1/2” bolts and locknuts.
Install the 3/8 EYEBOLTS to the outer ends of the boom, securing with
3/8-16 nuts and lock washers. Align the eyes parallel with the boom and tighten.
8. Orient the boom with the eyebolts "up”. Using a tape measure and a marking pen or masking tape,
place a mark 1/2” in from the
rear
of the boom. This will be where you position the back edge of
the clamp plate for element #1. Now measure forward 98” from that mark and make another mark
for element #2. Continue marking the locations of all the elements using the element spacing
figures given on the Dimension Sheet.
9. Attach Element #1, the linear loaded element, to the boom. For ease of element installation,
support the boom about 3’ above ground, eyebolts "up." Slip Element #1 over the rear of the boom,
placing the back edge of the rear plate on your first mark. ALIGN the elements horizontal
perpendicular to the eyebolts and tighten bolts EVENLY and firmly. Use element #1 as the element
alignment reference.
10. Mount element #2 and align and tighten as before. Note it is usually easier to begin installing the
phasing lines at this time between each new element mounted. Mount the next to the longest pair
as shown on the dimension sheet. Hold the spacer in place loosely around the boom with a large
nylon tie but don't tighten it yet. Adjust phasing lines so that their bends are even and the lines run
parallel to the boom.
ALSO ATTACH THE 13 TURN COIL ACROSS ELEMENT #1 Tighten only the clamps on Element #1
at this time. After installing element number #3, then install the longest set of phasing lines
between #2 and #3 and tighten the clamps at Element #2, and so on. Continue until you get to
element #8 where the 4:1 BALUN is attached. Add the two 3 turn COILS to the balun and attach
the other end of the coil leads to the bolts that tighten the rod clamps.
11. Now mount the DIRECTOR as shown on the DIMENSION SHEET. Align the completed elements
as required with the element #1 at the other end of the boom.
.
Attach the BOOM TO MAST PLATE using 4 more 4” machined saddles. Mount the plate at the end
of the 4” boom section. This should be close to the physical balance point as well. Reshape the
phasing lines as needed to clear the plate by at least 1/2”.
8-30LP9 ASSEMBLY MANUAL
Summary of Contents for 8-30LP9
Page 5: ...8 30LP9 DIMENSION SHEET ...
Page 6: ...8 30LP9 ELEMENT ASSEMBLY ...
