M2 Antenna Systems 40M4LLDD, Assembly Manual

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assemblies and align all holes. For both, insert a 1/4-20 x 2“ bolt and secure with 1/4-20 locknuts.
BESURE TO INSTALL THE FRONT DRIVEN ELEMENT TIPS ON THE ELEMENT CLAMP PLATE
ASSEMBLY WITH THE BALUN ANGLE BRACKET.
7
. LINEAR LOADING ROD INSTALLATION (FOR BOTH ELEMENT HALVES)
Place each element assembly on a level surface with the support post up. FROM THE ELEMENT
BUTT SIDE, feed a 3/16” x 120” LINEAR LOADING ROD through the flat support insulator and on to
each LL ARM. The rod should protrude just 1/2” from each arm. Tighten the 8-32 x 1/4" set screws.
Install a SHAFT RETAINER, onto this rod tip and snug up to linear loading arm. Repeat for all of the
other element halves.
NOTE: to start the RETAINER, hold the 3/8 x 3" PUSH TUBE in your hand with one end between your
thumb and forefinger. Now center the retainer on this end, “dish” into tube, and hold in place with the
same thumb and forefinger. Grasp the linear loading rod near the end with your other hand and firmly
push the retainer onto the rod.
8. SHORTING BAR PREPARATION
Locate the 16 shorting bar halves. Assemble the shorting bars with 8-32 x 1” screws and locknuts.
Finger tighten the locknuts for now. Next, begin to assemble the phyllistrand tension lines as shown
on the ELEMENT HARDWARE drawing. On each shorting bar, insert one end of each length of
PHILLISTRAN HPTG-1200 CORD into the CENTER hole of the shorting bar. Loop the cord AROUND
THE STRAIN RELIEF and back through the other hole and allow about 2” to protrude. Place a cable
clip here as a “backup” to the final clamping action of the shorting bar halves. Don’t tighten the
hardware at this time.
(OPTIONAL)> On each phyllistrand tension line insert two more 1/8” cable clips and allow them to
slide all the way to the shorting bar for now.
9. SHORTING BAR INSTALLATION
Next, feed each shorting bar onto the pair of linear rod ends and position about them at the
measurement as shown on the DIMENSION SHEET. NOTE the dimension is measured from the
OUTSIDE edge of the LL arm to the OUTSIDE edge of the shorting bar. (USING A BLACK
MPERMANENT MARKING PEN OR EQUIVALENT, MARK THE SPOT ON THE ROD WHERE THE
SHORTING BAR SHOULD BE) Be sure the linear loading lines are centered about the main element.
Once the shorting bars have been correctly set, tighten all of the 8-32 hardware. Cut off the excess
material so that about 1” of rod extends beyond the shorting bar. Start a SHAFT RETAINER onto each
rod tip. Push the retainers up against the shorting bar. Repeat for all of the other element halves.
10. SUSPENSION OF PHYLLISTRAND TENSION LINES
At this point you might want to perform the remaining steps with a friend.
On a flat surface, support the ends of each element tip up so that it is at the same height as the center
section. Next insert the phyllistrand tension lines through their respective turnbuckles, around each
thimble eye, and then finally back through the two cable clips. See the ELEMENT HARDWARE
drawing for an illustration. Now pull on the free end of the phyllistrand until the entire element appears
to be level. (IT MAY BE HELPFUL TO RAISE THE OUTER END OF THE ELEMENT HALF WITH A
4” BLOCK OF WOOD OR BRICK. At this point, secure the tension line by tightening the two 1/8” cable
clips. Repeat this procedure for all the other element halves. The final tensioning of the linear loading
rods is done with the TURNBUCKLES. This can be performed after the elements have been secured
to the boom.
11. BOOM ASSEMBLY
Use the BOOM HARDWARE drawing as a guide to assemble the boom. At this point it will be helpful
to perform the remaining assembly steps with the antenna elevated off the ground (about 3 feet). This
can be accomplished by using sawhorses or something similar. Wipe off the swaged ends of each
boom section and apply a small amount of Penetrox. Insert the swaged ends of the two similar boom
sections into either end of the straight piece. Align all of the holes, install the 1/4-20 x 3-1/2" bolts and
locknuts, and tighten.
40M4LLDD ASSEMBLY MANUAL