6. Mount the DRIVEN ELEMENT BLOCK to the boom using a single 8-32 X 1-1/4" screw and
lockwasher. Orient the block with feed connector facing to center and balun connectors facing to
rear. Block orientation may be reversed if you wish feedline to exit from rear of boom.
7. Attach balun and tighten the connectors
gently
using a 7/16" end wrench. A lot of torque is
unnecessary. Form the balun close to the boom and secure to boom with a nylon cable tie. Tie
should be snug but not crushing or kinking the coax.
8. Install the 8-32 x 1/4” set screws (internal Allen head - tool supplied) into the SHORTING BARS.
Slide the bars onto the 3/16” rod driven element tips and 1/8” Driven Element Block Rods. Position
the Shorting Bars as specified on the Dimension Sheet: the distance given is between the outer
edge of the Driven Element Block and the inner edge of the Shorting Bar. Align the bars and rods
with each other and tighten the setscrews.
9. The boom to mast plate is normally mounted at the balance point. 1" U-bolts and the stainless nuts
and lock washers provided. DO NOT OVER TIGHTEN. 2” U-bolts are provided for mounting the
antenna to your mast. Since the feed line represents significant weight it is best to have it attached
and fastened along the boom with cable ties before balancing the boom and mounting the plate.
10.
MOUNTING AND STACKING INFORMATION
Keeping metallic masts, crossbooms and the feed coax out of the element plane will help maintain
good VSWR and pattern.
FOR HORIZONTAL POLARIZATION, the 440-18 may be mounted to a metallic vertical mast or a
horizontal NON-METALLIC crossboom (no conductive material in element plane). If mounted to a
horizontal crossboom, route the feedline forward to the boom-to-mast plate, loop down, and bring
back to crossboom at least 6” beyond element tips.
FOR VERTICAL POLARIZATION, the 440-18 may be mounted to a NON METALLIC VERTICAL
MAST (no conductive material in element plane) or a horizontal metallic crossboom. If mounted to
a vertical mast, route the feed line forward to the boom-to-mast plate, loop out at a right angle to
the boom, and bring down to the mast at least 6 inches BELOW THE ELEMENT TIPS. The
feedline may also exit at the rear of the boom and loop back to the mast.
Stacking?
Call
M
2
and let us help you DO IT RIGHT
T
HIS COMPLETES THE ANTENNA ASSEMBLY.
CAREFULLY MANUFACTURED BY:
M
2
ANTENNA SYSTEMS, INC.
4402 N. Selland Ave.
Fresno, CA 93722
(559) 432-8873 Fax: 432-3059
www.m2inc.com
Email:
440-18 ASSEMBLY MANUAL
Summary of Contents for 440-18
Page 4: ...440 18 DIMENSION SHEET...
