M2 Antenna Systems 11M5DX User manual

M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722
Tel: [phone] Fax: [phone] Web: www.m2inc.com
©2015 M2 Antenna Systems Incorporated 02/16/15
Rev.02
Model .........................................11M5DX
Frequency Range.......................26.8 To 27.6 MHz
*Gain ..........................................10.44 dBi
Front to back ..............................24 dB Typical
Beamwidth ...............................E=34° H=39°
Feed type ...................................Direct feed
Feed Impedance. .......................50 Ohms Unbalanced
Maximum VSWR........................1:1 Typical
Input Connector..........................SO-239
Power Handling ..........................3 kW, Higher avl.
Boom Length / Dia......................26.7’ / 2”
Maximum Element Length..........18.75’
Turning Radius: ..........................14.8’
Stacking Distance.......................Call Factory
Mast Size....................................2” Nom.
Wind area / Survival ...................5.13 Sq. Ft. / 100 MPH
Weight / Ship Wt.........................30 Lbs. / 36 Lbs.
M2 Antenna Systems, Inc.
Model No: 11M5DX
FEATURES:
The 11M5DX is a great performer for its size. IT’S UPSABLE! Like all our “DX” series. The computer optimized design allows
full band coverage with good gain and front to back. Mechanically, CNC machined aluminum (6061-T6) rings clamps ground the ele-
ments to the boom and make assembly a snap. An overhead guy system is supplied. A hairpin type match couples the 3 kW 1:1 bal-
un to the feed line. The antenna is completely DC grounded.
SPECIFICATIONS:
*Subtract 2.14 from dBi for dBd

11M5DX ASSEMBLY MANUAL
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. LAYOUT 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. 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. 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 60” 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
cradle. 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. RE-CHECK and tighten all the hairpin match assembly and driven element
assembly hardware, including the balun studs.
PARASITIC ELEMENT ASSEMBLY
6. Assemble the other four 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.

11M5DX ASSEMBLY MANUAL
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. Center the BOOM TO MAST PLATE 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.
8. To prepare the overhead guy system, begin by temporarily installing a 2” U-bolt through the
TURNBUCKLE PLATE and into the top set of 2” U-bolt holes on the boom to mast plate. Add a couple of
5/16” nuts to hold it in place. UNSCREW the turnbuckle eyes / hooks until only a thread or two shows
inside the turnbuckle body and hook them to turnbuckle plate.
9. Uncoil DACRON CORD. Secure one end to rear eyebolt, taking two turns through the eyebolt, then
adding three TIGHT half-hitches. Pull hard on cord to set the knots. Repeat for the front eyebolt. Seal cord
ends with heat (lighter, propane torch, etc) and tape to main length.
10. Equalize cord length at turnbuckle plate and cut. Put two turns trough rear turnbuckle eye. Pull the
Dacron rope as tight as possible and add three TIGHT half-hitches. Repeat for front cord section. Seal and
tape cord ends. When finished the overhead guys should be taught and laying parallel with the boom.
Now remove the turnbuckle plate from the boom to mast plate and lift it temporarily to note the
approximate height at which the boom becomes level. (usually about 3 feet).
11. During final installation on the tower / mast, secure the turnbuckle plate at the appropriate height with
the 2” U-bolt. Then lean or pull on the cords to increase the tension and help the knots take their final “set.”
Make sure the knots are not slipping. When the guy system has taken a “set”, loosen the 2” U-bolt and
adjust turnbuckle plate height until boom is straight and level. Finer adjustments can be made with the
turnbuckles at any time, if necessary.
12. This completes the ASSEMBLY.
REMEMBER to support the feedline at the antenna boom and on the mast. Leave an adequate feedline
loop for rotation around the tower. When stacking this antenna with other H.F. models, maintain at least 8’
separation; more if practical. Mount horizontally polarized VHF and UHF antennas at least 40” above or
below this antenna to minimize interaction.
Carefully designed and manufactured by:
M2ANTENNA SYSTEMS, INC.
4402 N. SELLAND AVE.
FRESNO, CA 93722
[phone] FAX: [phone]
www.m2inc.com Email: [email protected]

11M5DX DIMENSION SHEET
45.25”

D.E., REFLECTOR & DIRECTOR DETAIL
M2ANTENNA SYSTEMS, INC.
4402 N. SELLAND AVE.
FRESNO, CA 93722
[phone] FAX: [phone]
www.m2inc.com Email: [email protected]
DRIVEN ELEMENT ASSEMBLY
REFLECTOR & DIRECTOR ASSEMBLY

GENERIC COMPRESSION CLAMP DETAIL

11M5DX PARTS & HARDWARE
DESCRIPTION ......................................................................................... QTY
BOOM SECTION #1: 2” X .065 X 84” SOE .............................................. 1
BOOM SECTION #2 & #3: 2” X .065 X 84“ SOE......................................2
BOOM SECTION #4: 2” X .065 X 80“....................................................... 1
D.E. ELEMENT SECTION #1: 1” X .058 X 12” SOE ................................ 2
D.E. ELEMENT SECTION #2: 3/4” X .049 X 60” SOE ............................. 2
ELEMENT SECTION #1: 3/4” X .049 X 60” SOE (W/ONE HOLE) ........... 8
ELEMENT TIP SECTIONS, 1/2” X .049 X SEE CUT LIST....................... 10
ELEMENT SLEEVE, 7/8” X 15” ................................................................ 4
HAIRPIN TUBE, 24” ................................................................................. 2
FIBERGLASS ROD, 7/8” X 15” ................................................................ 1
RING CLAMP, 2” ...................................................................................... 5
3/8” CLAMP BLOCK, 1” X 1-1/4” .............................................................. 4
BALUN, 1:1, 3-30MHz .............................................................................. 1
BALUN STRAP......................................................................................... 2
BALUN MOUNTING PLATE, 2” X 4” X 1/8”.............................................. 1
SHORTING BAR, 1/2” X 1/2” X 5” ............................................................1
POLY DISC, 2”OD WITH 7/8” HOLE........................................................ 2
BAND CLAMP, 2-1/2” with hole ............................................................... 1
SPACER, 3/8” X 1” ................................................................................... 1
BOOM TO MAST PLATE, 4” X 6” X 3/16” ................................................1
TURNBUCKLE PLATE, 2” X 4” x 1/4” ...................................................... 1
TURNBUCKLE, 5/16” ............................................................................... 2
DACRON ROPE, 5/16” X 25’.................................................................... 1
NYLON TIE, 11” (LARGE BLACK) ........................................................... 6
ZINC PASTE, 1 oz. CUP .......................................................................... 1
ASSEMBLY MANUAL .............................................................................. 1
HARDWARE:
COMPRESSION CLAMP, 5/8” ................................................................. 10
U-BOLT AND CRADLE, 2.5” .................................................................... 1
U-BOLT AND CRADLE, 2" ....................................................................... 5
EYEBOLT, 5/16-18 X 4”, ZINC ................................................................. 2
LOCKWASHER, 5/16, SS ........................................................................ 14
NUT, 5/16-18, SS ..................................................................................... 14
BOLT, 1/4-20 X 2-1/2”, SS .......................................................................6
BOLT, 1/4-20 X 2”, SS.............................................................................. 5
BOLT, 1/4-20 X 1-3/4”, SS .......................................................................8
BOLT, 1/4-20 X 1”, SS.............................................................................. 5
SET SCREW, 1/4-20 X 1/4”, SS............................................................... 2
LOCKNUT, 1/4-20, SS .............................................................................24
SCREW, 8-32 X 1-1/4”, SS ...................................................................... 4
SCREW, 8-32 X 1/2”, SS..........................................................................10
NUT, 8-32, SS .......................................................................................... 10
LOCKNUT, 8-32, SS ................................................................................4
ALLEN WRENCH, 1/8”............................................................................. 1
M2ANTENNA SYSTEMS, INC.
4402 N. SELLAND AVE.
FRESNO, CA 93722
[phone] FAX: [phone]
www.m2inc.com Email: [email protected]