M2 Antenna Systems 10M4DX Assembly Manual Download

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Note

: A cup of zinc paste (PENETROX, NOALOX, or equivalent) has been provided to enhance the

quality of all the electrical joints in this antenna.  Apply a thin coat wherever two pieces of aluminum
come in contact PARTICULARLY IN THE .DRIVEN ELEMENT MATCHING ASSEMBLY.

BOOM SETUP AND ASSEMBLY
1.  Refer to the Dimension Sheet. Note the different boom sections and the approximate position of
each element. LAY OUT the boom sections in order of assembly but do not couple together yet. Slide
the appropriate size and number of RING CLAMPS into their approximate positions on ALL boom
sections. For example, the rear boom section, 2” x 95”, has two 2” ring clamps.  Spread the ring
clamp fingers with a flatblade screwdriver to ease movement on boom. Loosely add a 1/4-20 x 1” bolt
and locknut to fingers of all clamps. NOW GO AHEAD AND ASSEMBLE THE BOOM. Add the two
EYEBOLTS and tighten in place. Then POSITION each ring clamp accurately starting with the rear
ring clamp about 1-1/2” in from the end of the boom. Final element alignment can be done once the
antenna is fully assembled.

DRIVEN ELEMENT ASSEMBLY
2. Locate the two 1” x 12” swaged tube sections. insert a 3/4 x 36” section into the swaged end and
add the 8-32 x 1-1/4” screws and locknuts. SPACE PERMITTING, add the correct set of 1/2” tips and
secure with 5/8” compression clamps. Locate the 7/8 x 15” center fiberglass section and slip the two
white polyethylene rings on the rod centering them between the outer and inner holes on each side.
Slide the two half element sections over the 7/8 x 15” center fiberglass rod insulator and add the 1/4-
20 x 2” bolts and locknuts loosely through the outer holes in the rod.
Locate the balun mounting plate and drop two 1/4-20 x 2” bolts through the smaller holes in the plate
and then down through the inner holes in the rod. Set this assembly onto the driven element ring
clamp. Add the 1/4" locknuts and tighten. Mount the 1:1 balun to the plate using one 2-1/2” U-bolt and
saddle. Orient the balun so the drain/vent hole is down and tighten the U-bolt gently.

3. Locate the 1/2” wide balun straps and connect one to each side of the balun finger tight. Now
remove the loose bolts holding the element halves to the rod and insert the bolts up from the bottom,
through the rod and element butt. Place two clamp blocks on each stud. Place the balun strap on the
remaining stud and add the nuts loosely.

4. Locate the band clamp and insert a 1/4-20 x 2” bolt through the hole from the inside. Add the 3/8” x
1” spacer tube to the bolt and set the shorting bar on the spacer. Add a locknut and finger tighten.
Slide the long, straight ends of the 3/8” hairpin tubes through the shorting bar and add the 1/4-20 x
1/4” set screws to each end of the shorting bar but don’t tighten yet. Set the open band clamp on the
boom just in front of the driven element and feed the hairpin tubes into the clamp block openings until
they are flush with the back edges. Align the tubes and begin to tighten up the clamp block bolts.

5. Adjust the shorting bar position,(see dimension sheet) align and tighten the set screws. Now
tighten the band clamp. RECHECK and tighten all the hairpin match assembly and driven element
assembly hardware, including the balun studs.

PARASITIC ELEMENT ASSEMBLY
6. Assemble the other three pairs of elements. Insert two 1/4-20 x 2” bolts down through the 1”
section and set each on the correct ring clamp on the boom. Add the 1/4-20 locking nuts and tighten.

OVERHEAD GUY ASSEMBLY
7. If possible, attach the feedline to the balun and route it forward to about 12 feet from the rear of the

boom. Seal the connector with black tape, coax seal or equivalent. Now pick up the antenna and
mark the balance point. It should be just under 12 feet from the rear of the boom Center the
BOOM TO MAST PLATE here and secure to the boom with two 2”- U-bolts, cradles, stainless
lockwashers and nuts. 2” U-bolts are supplied for attaching the antenna to the mast.

10M4DX ASSEMBLY MANUAL