M2 Antenna Systems 2M5WL 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

Model .........................................2M5WL

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

*Gain ..........................................16.84 dBi

Front to back ..............................22 dB Typical

Beamwidth ...............................E=26° H=29°

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

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

Maximum VSWR........................1.2:1

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

Power Handling ..........................1.5 kW

Boom Length / Dia......................33’ / 1-1/2” to 3/4”

Maximum Element Length..........40-5/8”

Turning Radius: ..........................18’ 9”

Stacking Distance.......................14’ High & 14’ Wide

Mast Size....................................2” Nom.

Wind area / Survival ...................2.7 Sq. Ft. / 100 MPH

Weight / Ship Wt.........................13 Lbs. / 14 Lbs.

M2 Antenna Systems, Inc.

Model No: 2M5WL

FEATURES:

The 2M5WL is designed with the SERIOUS “Weak Signal” enthusiast in mind. It provides excellent gain for min-

imum weight and wind load yet is strong enough to survive 100+ mph winds. The modified folded dipole driven element is

also unique as it’s center is a CNC machined block of aluminum fitted with 'O' ringed connectors and access cap. After

factory assembly, the block is filled with a space age silicone gel which further seals and increases dielectric breakdown

and arc-over protection. The 3/16” rod elements mount through the boom on UV stabilized button insulators. All hardware

is stainless steel except for U-bolts. A vertical riser and an overhead Dacron cord guy system is supplied for boom sup-

port. This antenna is widely used in EME (W5UN’s 48 2M5WL’s and many others) and large Tropo scatter arrays. Sever-

al optional items are available to provide more gain from your 2M5WL’s. 2 and 4 port power dividers are available for

matching stacks of 2 or 4 antennas. 50 Ohm phasing lines model VHF-50-2M5WL2 and VHF-50-2M5WL4 can be ordered

for phasing 2 or 4 antennas together. ‘H’ frames, OR-2800 and MT-3000 AZ and EL rotators are also available as well as

Rohn and US towers.

SPECIFICATIONS:

*Subtract 2.14 from dBi for dBd

1. Start by laying out the boom sections using the DIMENSION sheet as a guide. Use 8-32 X 1-1/4

screws and locknuts to join 3/4” to 1” sections; 1-1/2” screws for 1” to 1-1/4” sections; 1-3/4”

screws for 1-1/4” to 1-1/2” and 1-1/2" to 1-1/2" sections.

To make assembly easier, support the boom about waist high on bucks, tables, etc. Or, drive a 1-

1/2” to 2” pipe into the ground and temporarily attach boom using boom to mast plate and U-bolts

at balance point.

2. 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. Push 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 shaft retainers yet. This is easier to do after all the elements are installed in the

boom.

3. Install the 3/16” rod DRIVEN ELEMENT as you did the reflector. Then continue with the installation

of the DIRECTORS. Note that the Director Elements do not consistently diminish in length

from rear to front, so pay close attention to length and position.

4. Now begin centering the elements. Use a tape measure to EQUALIZE the amount the element

sticking out 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.

5. NOTE: The SHAFT RETAINERS should always be used to secure the elements for permanent

and long term antenna installations. However, for portable or temporary use, or whenever it is

anticipated that the antenna will be disassembled within a short time, the retainers may be left off.

The button insulators, normally a tight fit, will hold the elements quite securely.

To install the stainless steel element SHAFT RETAINERS, start by using thumb and forefinger to

hold the retainer against the end of the PUSH TUBE ( 3/8 x 3” push tube, supplied in the kit),

internal fingers on retainer dished into tube. HOLD THE ELEMENT FIRMLY TO PREVENT IT

FROM SLIDING OFF CENTER and press the retainer onto the element end and continue until

retainer butts on insulator button (Locking pliers, lightly clamped up against opposite button

insulator will help maintain center reference. If you push the first retainer too far, remove element

from boom and push retainer completely off the element). Now repeat for the other side of the

element. Continue installing retainers until all elements are locked in place.

6. Mount the DRIVEN ELEMENT 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 to center and balun connectors facing to

rear. Block orientation may be reversed if you wish feedline to exit from rear of boom.

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

black Neoprene face 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.

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 at the very ends of the 3/16” rod (through the boom). Align the

bars and rods with each other and tighten the set screws.

9. Attach the square 18” RISER TUBE to the boom-to-mast plate using two 8-32 x 1-1/4” screws and

locknuts. The large holes at the top of the riser are slightly off-center and should be oriented away

from the boom-to-mast plate and closer to the centerline of the boom.

2M5WL ASSEMBLY MANUAL

SETSHORTINGBARSAT:

DIMENSIONSHEET

176.25

329.937

396.437

363.188

297.437

9.437

288.0

234.875

265.75

205.0

3.875 231.0

122.313

148.625

97.562

BOOMTOMAST

PLATE

SEESTEP#9

174.0

2.25

8.313

114.0

ELEMENTSPACING

22.50

74.688

36.25

15.75

0.50

17.688

57.0

2M5WL

17.75"

DECIMALTO

FRACTION

CONVERSION

.062=1/16

.125=1/8

.188=3/16

.250=1/4

.313=5/16

.375=3/8

.437=7/16

.500=1/2

.562=9/16

.625=5/8

.688=11/16

.750=3/4

.813=13/16

.875=7/8

.937=15/16

35.625

34.75

34.25

34.937

DIMSA

M.STAAL

5-25-89

REV9-11-02

35.25

35.062

35.437

36.062

35.75

36.25

ELEMENTLENGTH

37.5

36.562

36.937

37.25

38.0(3/16"rod)

40.625

2M5WL DIMENSION SHEET

10. The boom to mast plate is normally mounted at the balance point, about 13’ 2” from rear of boom.

Use two 1-1/2" U-bolts and the stainless nuts and lock washers provided. DO NOT OVER

TIGHTEN. 2” U-bolts are provided for mounting the antenna to your mast. Since the feed line

represents significant weight it is best to have it attached and fastened along the boom with cable

ties before final mounting the plate.

11. Refer to Boom support drawing. Install the two small “U” shaped rods into the top side of the

boom. Secure with SHAFT RETAINERS.

12. Install the two turnbuckles into the top of the riser with open ends of the hooks “UP”. Adjust

threads until just one or two show inside turnbuckle body. Adjust the boom with supports until the

middle is 4” to 6” LOWER than the ends. Attach one end of the Dacron cord to the rear eye bolt by

taking two wraps through the eye and finishing with two half-hitches or a square knot. Adjust to

leave 2” to 4” of cord after knots. Attach the other end of the cord to the front eye bolt in the same

way. Equalize excess cord at the riser tube and cut. Take rear cord end and make two wraps

through rear turnbuckle eye, then pull line taut and knot as above. Repeat for front cord and

turnbuckle.

13. Now support antenna at the boom-to-mast plate. This tensions the cord and helps the knots to

take a set. If possible, let this process extend overnight. Then adjust turnbuckles so boom ends

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

lengths from cord, leaving 2” to 4”. To prevent fraying melt ends with heat or flame and tape back

to main line.

THIS COMPLETES THE ANTENNA ASSEMBLY.

INSTALLATION AND STACKING INFORMATION

A. Always use high quality coax and connectors, as old, corroded, or poor quality materials are

common sources of performance degradation and failure.

B. If possible, test the antenna, connectors and feed line 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 band. It should be 1.5:1

or better from 144 to 146 MHz and then rise to about 2:1 at 148 MHz. Remember, the 2M5WL is

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

common modes.

C. 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.

If you are unsure about stacking multiple antennas, please call M2 and let us help you DO IT

RIGHT

CAREFULLY MANUFACTURED BY:

M2 ANTENNA SYSTEMS INC.

4402 N. Selland Ave.

FRESNO, CA 93722

(559) 432-8873 FAX (559) 432-3059 Web:www.m2inc.com Email:[email protected]m

2M5WL ASSEMBLY MANUAL

2M5WL D.E. & OVERHEAD DETAIL

REPLACE

WITH

EYE BOLT

DESCRIPTION QTY

BOOM SECTION #1, 1 X .058 X 60” STR ............................ 1

BOOM SECTION #2, 1-1/4 X .058 X 60” SOE...................... 1

BOOM SECTION #3, 1-1/2 X .058 X 60” SOE...................... 1

BOOM SECTION #4, 1-1/2 X .058 X 60” SBE ...................... 1

BOOM SECTION #5, 1-1/4 X .058 X 60” SOE...................... 1

BOOM SECTION #6, 1 X .058 X 60” SOE............................ 1

BOOM SECTION #7, 3/4 X .049 X 55” STR ......................... 1

ELEMENTS, 3/16 ROD x Dimension Sheet.......................... 17

DRIVEN ELEMENT BLOCK ASSEMBLY ............................. 1

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

BOOM-TO-MAST PLATE, .188 X 6 X 4”............................... 1

VERTICAL RISER, 3/4 X 18” ................................................ 1

TURNBUCKLES, 1/4 X 4’ ..................................................... 2

U-BOLT AND CRADLE, 2’ .................................................... 2

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

DACRON CORD, 3/32” X 25’................................................ 1

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

IN HARDWARE BAG:

SHORTING BAR................................................................... 2

EYE BOLT X 2.5 ZN ............................................................. 2

BUTTON INSULATORS ....................................................... 34

SHAFT RETAINER, SS ........................................................ 34

NUT, 5/16-18 SS................................................................... 8

LOCKWASHER, 5/16 SS...................................................... 8

NUT, 1/4-20 SS..................................................................... 2

LOCK WASER, 1/4 SS ......................................................... 2

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

SCREW, 8-32 X 1-1/4 SS ..................................................... 7

SCREW, 8-32 X 1-1/2 SS ..................................................... 4

SCREW, 8-32 X 1-3/4 SS ..................................................... 4

SCREW, 8-32 X 2 SS ........................................................... 2

LOCKNUT, 8-32 SS .............................................................. 16

CABLE TIE, NYLON ............................................................ 5

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

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

CAREFULLY MANUFACTURED BY:

M2 Antenna Systems, Inc.

4402 N. Selland Ave.

FRESNO, CA 93722

(559) 432-8873 FAX (559) 432-3059

2M5WL PARTS & HARDWARE

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