5. 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 then onto the Driven Element Block
Rods. Position the Shorting Bars as specified on the Dimension Sheet: 1-3/4”. Align the bars and
rods with each other and tighten the setscrews.
6. Insert the 7/8” x 9” REINFORCING SLEEVE into the rear of boom, flush with end. The boom to
mast plate is normally mounted at the rear. Use two 1" U-bolts and the stainless nuts and lock
washers provided (cradles are not used). DO NOT OVER TIGHTEN. 2” U-bolts are provided for
mounting the antenna to your mast.
T
HIS COMPLETES THE ANTENNA ASSEMBLY.
7. INSTALLATION AND STACKING INFORMATION
A. To protect your investment in this high performance antenna, always use high quality coax and
connectors. Old, corroded, or poor quality materials are common sources of serious performance
losses.
B. If possible, test the antenna, connectors and feedline BEFORE installing to your mast or tower.
At 6 feet or more the antenna will exhibit VSWR
similar
to higher mounting heights. Set antenna
on a ladder or temporary mast. Check for continuity and match across the rated bandwidth.
C. REAR MOUNTING: The 2M4 is easily rear-mounted in either horizontal or vertical polarity. A
metal mast or crossboom will have no effect on performance.
D. CENTER MOUNTING: Metal masts or crossbooms are OK for center mounting the antenna IF
they are at right angles to the element plane. ALWAYS use a NON-CONDUCTIVE mast or
crossboom IF it will be in the element plane. A metal mast in the element plane WILL adversely
affect performance. The feed coax, too, if routed to the center, must exit the boom at right angles
to the element plane. For example, with a vertically polarized antenna on a vertical non-
conductive mast, loop the coax out at a right angle from the elements and reattach to mast at least
6” below the element tips. Or, the coax can exit the rear of the boom and loop back to the mast.
Fiberglass is the prime material for a non-conductive mast because of it’s strength and weather
resistance. Wooden rod can also be used or thick-wall PVC pipe with a wooden rod inside for
support.
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: [email protected]
2M4 ASSEMBLY MANUAL
Summary of Contents for 2M4
Page 4: ...2M4 DIMENSION SHEET...
