M2 Antenna Systems 2M4 User manual

M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722

Tel: (559) 432-8873 Fax: (559) 432-3059 Web: www.m2inc.com

Rev.01

Model .........................................2M4

Frequency Range.......................144 To 148 MHz

*Gain ..........................................9.6 dBi

Front to back ..............................20 dB Typical

Beamwidth ...............................E=54° H=74°

Feed type ...................................“T” Match

Feed Impedance. .......................50 Ohms Unbalanced

Maximum VSWR........................1.5:1

Input Connector..........................“N” Female

Power Handling ..........................2.5 kW

Boom Length / Dia......................48” / 1”

Maximum Element Length..........40-1/2”

Turning Radius: ..........................55”

Stacking Distance.......................66” High & 80” Wide

Mast Size....................................1-1/2” to 2” Nom.

Wind area / Survival ...................0.50 Sq. Ft. / 100 MPH

Weight / Ship Wt.........................3 Lbs. / 4 Lbs.

M2 Antenna Systems, Inc.

Model No: 2M4

FEATURES:

Clean mechanical design, full band coverage and computer optimized performance make the 2M4 an exceptional

antenna. A totally sealed and grounded driven element design with a unique internal balun provides the heart that will

beat for years to come. It is perfect for base and portable use, with FM, Packet or SSB. Every station needs one!!!

SPECIFICATIONS:

*Subtract 2.14 from dBi for dBd

Tools handy for assembly process: screwdriver, 11/32” spin-tite or socket, 7/16” and 1/2” end wrenches /

sockets, measuring tape.

1. Lay out the elements by length and position as shown the DIMENSION sheet. Start with the

REFLECTOR (longest) element. Balance on finger to find rough center and push on a black button

insulator to about 1/2” from center. Push the element through the holes 10" from the rear of the boom

and install the second button, snugging it up into boom. DO NOT BOTHER WITH ACCURATELY

CENTERING the element at this time and DO NOT INSTALL the stainless steel SHAFT RETAINERS

yet. This is easier to do after all the elements are installed in the boom. Install the 3/16” rod DRIVEN

ELEMENT as you did the reflector and then the DIRECTORS.

2. Now accurately center the elements. Use a tape measure to EQUALIZE the amount the element

sticking out on each side of the boom. Begin installing the stainless SHAFT RETAINERS.” Use thumb

and index finger to hold a retainer over end of the 3/8 x 3” push tube (retainer dished into tube). Hold

the element firmly and start the retainer onto the rod by applying pressure with the push tube. Push

the 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

retainer too far). Repeat for the opposite side. Continue installing retainers until all elements are

locked in place.

3. Mount the “T” MATCH BLOCK ASSEMBLY to the top of the boom using a single 8-32 X 1-1/4" screw.

Orient the block with feed connector facing the rear and balun connectors facing forward.

4. Before installing the balun, thread a 3/8” SEAL NUT all the way onto each connector, with the black

Neoprene face of the nuts facing out. 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. Form the balun close to the boom and secure with a nylon cable tie. Tie should be snug

but not crushing or kinking the coax.

2M4 ASSEMBLY MANUAL

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.

THIS 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:

M2ANTENNA SYSTEMS, INC.

4402 N. Selland Ave.

Fresno, CA 93722

(559) 432-8873 Fax: 432-3059

www.m2inc.com Email: [email protected]

2M4 ASSEMBLY MANUAL

2M4 DIMENSION SHEET

Description Qty

Boom, 1 x .058 x 53" alum.................................1

Boom insert, 7/8 x .058 x 9.0" alum. ..................1

Elements, 3/16" rod alum. .................................4

“T” match block &1/4” rods ................................1

BTM plate, 3 x 4 x 1/8” (M2APT0019) ...............1

Balun, RG-6.......................................................1

U-bolt and cradle, 2" ........................................2

U-bolt, 1" ...........................................................2

Assembly instructions........................................1

Hardware Bag

Shorting Bar (M2ASB0090) ...............................2

Nut, 5/16-18 ss ..................................................4

Lock washer, 5/16" split ring ss .........................4

Nut, 1/4-20 ss ....................................................4

Lock washer, 1/4" split ring ss ...........................4

Setscrew, 8-32 x 1/4” int. Allen head, ss ...........4

Screw, 8-32 x 1-1/4" pan head ss......................1

Seal Nut.............................................................2

Button insulator 3/16" black polyethylene ..........8

Shaft retainer, 3/16" ss ......................................8

Push tube, 3 x 3/16" (retainer tool) ...................1

Allen wrench, 5/64"............................................1

Cable tie ............................................................3

M2ANTENNA SYSTEMS, INC.

4402 N. Selland Ave.

Fresno, CA 93722

(559) 432-8873 Fax: 432-3059

www.m2inc.com Email: [email protected]

2M4 PARTS & HARDWARE

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