M2 Antenna Systems 2M8WL Manuel utilisateur

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

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

Rev.00

Model .........................................2M8WL

Frequency Range.......................144 To 144.6 MHz

*Gain ..........................................18.5 dBi

Front to back ..............................26 dB Typical

Beamwidth ...............................E=20° H=21°

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......................55’ / 2-1/2” To 1-1/2”

Maximum Element Length..........21-3/16”

Turning Radius:..........................29’

Stacking Distance.......................17’ High & 17’ Wide

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

Wind area / Survival...................5.5 Sq. Ft. / 100 MPH

Weight / Ship Wt.........................50 Lbs. / 59 Lbs.

M2 Antenna Systems, Inc.

Model No: 2M8WL

FEATURES:

The 2M8WL provides the user with not just improvements in gain and front to back ratio but also features a robust

boom design, making the antenna capable of handling winds over 100 MPH. The 2M8WLHD features the same highly

reliable, CNC machined, driven element components used on our other VHF and UHF yagis. The boom tapers from 2.5"

in the 23 foot middle section to 1.5" at the rear and front. It is top guyed with dacron cord. A single 2M8WL provides the

gain requirement to make EME contacts with even small 4 yagi stations. It passes the echo test by producing its own

audible echoes even when pointed up with no ground gain! Obviously it is dynamite on Tropo! There's absolutely nothing

else like it.

SPECIFICATIONS:

*Subtract 2.14 from dBi for dBd

TOOLS REQUIRED: Screwdriver, 11/32 wrench, socket or spintite, a 7/16" and 1/2" wrench or socket,

tape measure. Please review these instructions and the 2M8WLHD DIMENSION SHEET before assembly.

1. BOOM ASSEMBLY

Refer to the 2M8WLHD DIMENSION SHEET as a guide. Note the FRONT and REAR locations of the

antenna and that it is pictured looking from underneath. Prior to beginning the assembly of the boom find a

LONG level surface to work on. Start by laying out the boom sections. Use 1/4-20 x 2” bolts and locknuts to

join 1-1/2” to 2” sections; 2-1/2” bolts for 2” to 2” sections and 2” to 2-1/2” sections; 3” bolts for 2-1/2” to 2-

1/2” sections. You will notice that several of the boom sections are the same length. The following notes will

help you determine which-one-goes-where:

1-1/2” sections: The rear section has 4 through holes for the elements and one through hole

perpendicular to the others. Orient this section piece with the cross bolt holes facing towards the front.

2 x 48” sections: The rear section has the 5/16” element through holecloser to its swaged end.

2 x 95” sections: Both the front and rear sections have 11/32” holes for the eyebolts. The rear

section has a through hole for an element closer to its unswaged end.

2-1/2 x 95” SOE: The front section has a through hole for an element closer to its unswaged end.

2-1/2 x 95” SBE: The rear end has a through hole closer to a swaged end.

After assembly, double check boom sections against ELEMENT SPACING figures on Dimension Sheet.

2. BOOM TO MAST PLATE

At this time it may be convenient to add the boom to mast plate. The 6 x 8 x 1/4” plate mounts approximately

24” from the front element hole on the center most section of the boom. Use two 2-1/2 inch U-bolts and

cradles and the 5/16” stainless steel lockwashers and nuts. TEMPORARILY position the plate under the

boom. This way the boom can be laid across a bench or bucks and the plate will keep the boom from

rotating while installing the elements.

3. ELEMENT ASSEMBLY

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

(longest) element. Balance across finger to find center and push on a black button insulator to about 1/2”

from center. Insert the element through the holes 1/2" 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 internal locking “KEEPERS” yet. This is easier to do after all

the elements are installed in the boom. Note that the Director Elements do not consistently diminish in

length from rear to front, so pay close attention to length and position. We have enclosed a 1:1

scaled dimension chart to help sort out the 21 elements.

Now begin centering the elements. Use a tape measure to EQUALIZE element length on each side of the

boom. Once you have all the elements centered, sight down the element tips from the rear comparing each

side. Look for any obvious discrepancies and correct if found.

4. ELEMENT KEEPER INSTALLATION

Begin installing the stainless “keepers.” Use thumb and index finger to hold a keeper over end of the 3/8 x 3”

push tube (keeper dished into tube). Hold the element firmly and start the keeper onto the rod by applying

pressure with the push tube. Push the keeper 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 keeper too far). Repeat for the opposite side. Continue installing keepers until all elements are

locked in place.

5. DRIVEN ELEMENT INSTALLATION

Mount the DRIVEN ELEMENT “T” MATCH ASSEMBLY to the BOTTOM of the boom using a single 1/4-20 x

1-3/4" bolt and lockwasher. Orient the block with feed connector facing to center and balun connectors

facing to rear.

6. BALUN INSTALLATION

Before installing the balun, thread a 3/8” SEAL NUT all the way onto both connectors, 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 to boom with a nylon cable tie. Tie should be snug but not crushing or

kinking the coax.

7. SHORTING BAR INSTALLATION

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” driven element tips mounted through the boom and then onto the 1/4” rod of the “T”

match assembly. Position the Shorting Bars at 1-3/8” from the outer edge of the “T” match block to the

inner edge of the Shorting Bar. See Dimension Sheet. NO SWR ADJUSTMENT should be necessary for a

nearly perfect match at 144.2 MHz but adjusting these bars should allow you some optimization if you care

to place the minimum SWR somewhere within your antenna’s specified operating bandwidth. Align the bars

and rods with each other and tighten the setscrews.

8. BOOM TO MAST PLATE AND CENTER OF ROTATION

If you followed step 2 earlier, re-orient the BOOM TO MAST PLATE perpendicular to the elements and

relocate along the boom at or near the physical balance point of the antenna, which should be about 24”

from the first element on the front side of the center most boom section. You can also determine this

location simply by picking the antenna up. Re-tighten the boom to mast plate to the boom. 2” U-bolts are

supplied for attaching the plate to your mast.

9. INSTALLATION OF EYEBOLTS

See the Dimension Sheet for the eyebolt hole locations. Install the two 5/16 x 4 “ EYEBOLTS in the boom.

Use 5/16 stainless nuts and lockwashers to secure.

10. OVERHEAD GUY SYSTEM

Unscrew the turnbuckle eyes / hooks until only a thread or two shows inside the turnbuckle body. Install the

two turnbuckles into the two bottom U-bolt holes (closest to the boom). Uncoil DACRON ROPE. Secure one

end to the 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. Cut excess lengths from cord, leaving 2” to 4”. To

prevent fraying melt ends with heat or flame and tape back to main line. Equalize cord length at turnbuckle

plate and cut. Put two turns trough rear turnbuckle eye, pull slack out of rope, and add three TIGHT half-

hitches. Repeat for front cord section. Seal and tape cord ends. Both cords should now be fairly taut and

parallel with boom.

Supplied with this kit is a vertical support tube (VERTICAL RISER). You have the option to attach the

TURNBUCKLE L-BRACKET to the VERTICAL RISER OR to your mast. The Riser will enable you to install

the antenna at the very top of your mast, should you require it. It also allows the boom to be straight in two

dimensions. MAKE SURE THAT YOU HAVE DETERMINED THAT TOP MAST MOUNTING IS SAFE FOR

YOUR SYSTEM.

A). MAST MOUNTED OPTION

Disconnect the two turnbuckles from the boom to mast plate and install into the two holes on the L-bracket.

Install the a 2” U-bolt into the L-bracket and lift the Bracket up until the boom bows up slightly. This is

approximately how high the Bracket will need to be mounted on the mast when the antenna is installed.

During the final installation on the tower / mast, secure the Turnbuckle L-bracket at the appropriate height

with the 2” U-bolt. Then lean or pull on the cords to increase the tension and tighten the knots.

B). VERTICAL RISER OPTION

Install the Vertical Riser as shown in the figure on the next page. Make sure the bottom 8-32 x 1-1/4” screws

are oriented as shown with the locknuts on the boom side. Insert the remaining two 8-32 x 1-1/4” screws

into the Bracket and install the Bracket onto the Riser. Secure the assembly with the 8-32 locknuts. Now

temporarily lift the front and rear ends of the boom about 2’ above the ground (use small chairs, boxes, or

get a couple of friends to help), disconnect the two turnbuckles from the boom to mast plate, and install them

into the two holes onto the L-bracket. This should straighten the boom.

For both options, if possible, let guy system take a set overnight. Then adjust turnbuckles so boom ends

bow up slightly (and equally). A few days on the mast should leave the boom straight.

11. ANTENNA INSTALLATION AND STACKING INFORMATION

A. Never mount the antenna with a metallic mast or crossboom in the element plane: pattern and

performance will deteriorate. FOR HORIZONTAL POLARIZATION, the antenna may be mounted to a

metallic vertical mast or a horizontal NON-METALLIC / NON-CONDUCTIVE crossboom. 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. Antenna pairs are typically stacked one above the other in

horizontal polarity. See Stacking Reminders, below.

If you plan on stacking this antenna above / below other nonresonant antennas maintain at least 5’ of

separation distance.

For best noise reduction on terrestrial use stack this antenna 18.5’ in either plane. Stack this antenna 20’ in

either plane for moon bounce applications. An array of 4 (stacked 2 x 2) antennas should yield about 23dBd

of gain.

B. To optimize the performance from this high quality antenna, always use high quality coax and

connectors, as old, corroded, or poor quality materials are common sources of performance losses.

C. 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 that the match is close to the rated specifications. Remember, the

2M8WLHD is tailored for the lower half of two meters where horizontal polarity and sideband / CW are the

common modes.

STACKING REMINDERS:

1. All driven element blocks MUST be oriented to the same side of boom.

2. All boom-to-mast plates MUST be mounted at the same point on the boom.

3. Feed / phasing lines MUST be of equal electrical length or multiples of 1 wavelength in order to maintain

equal phasing in the array. Improper phasing can severely deteriorate performance.

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]

1-7-00 2M8WLHD

2M8WLHD

PARTS LIST 1-10-00

REV. 7-11-00

DESCRIPTION QTY

BOOM SECTION, 2.5 x .125 x 95” SBE...................1

BOOM SECTION, 2.5 x .125 x 95” SOE ..................2

BOOM SECTION, 2 x .065 x 95” SOE .....................2

BOOM SECTION, 2 x .065 x 48” SOE .....................2

BOOM SECTION, 1-1/2 x .065 x 60” SOE...............2

ELEMENTS, 3/16 ROD x Dimension Sheet.............21

DRIVEN ELEMENT “T” MATCH ASSEMBLY .........1

BALUN, RG-6 1/2 WAVE..........................................1

BOOM-TO-MAST PLATE, 6 x 8 x 1/4”.....................1

VERTICAL RISER, 3/4 X 24”....................................1

TURNBUCKLE EXT. BRKT......................................1

U-BOLT AND CRADLE, 2”.......................................5

U-BOLT AND CRADLE, 2-1/2”.................................2

DACRON CORD, 5/16” X 48’...................................1

ASSEMBLY MANUAL ..............................................1

IN HARDWARE BAG:

SHORTING BAR, 1/4 x 3/4 x 1-3/4...........................2

EYEBOLTS, 5/16 x 4”...............................................2

TURNBUCKLES, 1/4”...............................................2

BUTTON INSULATORS...........................................48

KEEPER, 3/16 SS ....................................................48

BOLT, 1/4-20 x 1-3/4”...............................................1

BOLT, 1/4-20 x 2”.....................................................4

BOLT, 1/4-20 x 2-1/2”...............................................8

BOLT, 1/4-20 x 3”.....................................................4

SCREW, 8-32 x 1-1/4”..............................................4

NUT, 5/16-18 SS ......................................................14

LOCKWASHER, 5/16 SS .........................................14

LOCKWASHER, 1/4-20 SS......................................1

LOCKNUT, 1/4-20 SS...............................................16

LOCKNUT, 8/32 SS..................................................4

SETSCREW, 8-32 X 1/4, SS....................................4

CABLE TIE, LARGE, NYLON ..................................6

SEAL NUTS, 3/8-32 .................................................2

ALLEN HEAD WRENCH, 5/64”................................1

PUSH TUBE, 3/8 X 3”...............................................1

M2ANTENNA SYSTEMS, INC.

4402 N. Selland Ave.

Fresno, CA 93722

(559) 432-8873 Fax: 432-3059

www.m2inc.com Email: [email protected]

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