over end of the 3/8 x 3” push tube (Shaft Retainer dished into tube). Hold the element firmly and
start the keeper onto the rod by applying pressure with the push tube. Push the Shaft Retainer
until up tight against the button insulator (Locking pliers,
lightly
clamped up against opposite button
insulator will help maintain center reference and keep you from pushing the first Shaft Retainer too
far). Repeat for the opposite side. Continue installing Shaft Retainers until all The HORIZONTAL
elements are locked in place. NOW repeat steps 2-5 for the VERTICAL elements.
6. Mount the DRIVEN ELEMENT T-MATCH BLOCKS per the position on the DIMENSION SHEET
using a single 8-32 X 1-1/4" screw for each. Orient the HORIZONTAL block with feed connector
facing to center the VERTICAL block with the feed connector facing the rear. VERTICAL block
orientation may be reversed if you wish LEFT HAND CIRCULAR.
7. Before installing the baluns, thread a 3/8” SEAL NUT all the way onto each connector, with the
black Neoprene side out. Now coil the rear or HORIZONTAL balun so it will not extend beyond the
reflector when installed. Attach balun to the Block and tighten the connectors
gently
using a 7/16"
end wrench. Once the connectors are tight, back the Seal Nuts out and finger-tighten firmly up
against the face of the connectors (or tighten
gently
with 1/2” end wrench). A lot of torque is
unnecessary. Squeeze the balun coil across the middle until it is 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 then onto the 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 116” from rear of boom. This should be the perfect
position when using the M
2
“T” BRACE KIT. Use two 1-12" U-bolts and the stainless nuts and lock
washers provided. DO NOT OVER TIGHTEN. 2” and 1-1/2” U-bolts are provided for mounting the
antenna to your 2” or 1-1/2” mast.
THIS COMPLETES THE ANTENNA ASSEMBLY.
10.
MOUNTING AND STACKING INFORMATION for 4 antennas.
Stacking distance is BEST at 144” to 152”.
Be sure all antennas are oriented so the
HORIZONTAL and VERTICAL driven element blocks are on the SAME SIDE of the boom and
NOT MIRROR IMAGE to each other. Holes in rear 1 inch boom section are provided for the “T”
brace kit mounting. Route the phasing lines onto the vertical legs of the “T” brace kit and then
forward to the main “H” frame cross boom. To minimize phasing line length, cutting across the
corners is fine and will not cause pattern degradation. M
2
can provide low loss LMR400 or LMR600
phase lines and 4 port power dividers.
M
2
ANTENNA SYSTEMS, INC.
4402 N. SELLAND AVE.
FRESNO, CA 93722
(559) 432-8873 FAX: 432-3059
www.m2inc.com
Email:
2MXP20 ASSEMBLY MANUAL
Summary of Contents for 2MXP20
Page 4: ...2MXP20 DIMENSION SHEET...
