M2 Antenna Systems 40M3FS Assembly Manual page 3

40M3FS ASSEMBLY MANUAL
6. Assemble the boom using 3/8-16 x 4" bolts, lock washers and nuts. Install the eyebolts
with the 1/8" wire rope attached. Using the correct spacing mark the driven element posi-
tion. Mount the 12 x 12 x 3/8" boom to mast plate on the DIRECTOR end loosely using 3-
1/2" saddles.
7. If a temporary 2" mast can be installed at this time, you can set up the overhead turn-
buckle plate with two (2) 2" u-bolts and , two (2) 3/8" forged turnbuckles. Install 4 heavy du-
ty 2" u-bolts on the plate and add the mast. Place the turnbuckle plate 6 to 7 feet above the
boom and loosely install the overhead cable.
8. Mount the inner sections of each element on the boom and align elements perpendicular
with the plane of the 3/8" forged eyebolts. You can determine the CENTER OF BALANCE
at this point since the element tips are very close to the same weight. Mount the BOOM TO
MAST (BMP) at this point using 3-1/2" saddles and 3/8-16 x 5" bolts and locknuts. Align the
plate and tighten. Then the cables can be final tensioned and the temporary mast re-
moved, readying the antenna for final installation
9. Attach the 1-1/2" and smaller element tips. Note the rear hole is enlarged so a 1/4"
u-bolt can be installed at this joint. Also install the 8-32 x 1-3/4" screw and locknut and
tighten securely. Align the eyebolt in the plane of the element and tighten securely.
10. With the antenna laying on flat ground, connect the outer end of each of the element
support cables using a 3/16" thimble or cable eye and two clips (small cable u-bolts). re-
move all the slack and tighten the clips. Final tensioning can be done from the center with
the other eyebolts and locknuts.
Before installing the antenna on a tower, go over all the hardware connections and be sure
each has been tightened. No movement should be detected in the element joints. Be care-
ful during installation and be sure you are clear of all power lines and other high obstruc-
tions. C U on 40! 73, Mike, K6MYC
CAREFULLY DESIGNED AND MANUFACTURED BY:
2
M ANTENNA SYSTEMS INC.
4402 N. Selland Ave.
Fresno, CA 93722
www.m2inc.com sales@m2inc.com