M2 Antenna Systems 2MXP20 Manuale utente

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

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

Rev.03

Model .........................................2MXP20

Frequency Range.......................144 To 146 MHz

*Gain ..........................................15.3 dBi

Front to back ..............................25 dB Typical

Beamwidth ...............................E=30° H=34°

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......................21’ 7” / 1-1/2” To 1”

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

Turning Radius:..........................146”

Stacking Distance.......................11’ 6” High & 12” Wide

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

Wind area / Survival...................1.9 Sq. Ft. / 100 MPH

Weight / Ship Wt.........................8 Lbs. / 12 Lbs.

M2 Antenna Systems, Inc.

Model No: 2MXP20

FEATURES:

This dual polarized yagi was computer designed for the serious Moonbouncer.The very good G/T is a result of

low side and back lobes and the design has been optimized for stacking. This antenna is remarkable in that the stacking

gain for four antennas exceeds 6 dB. Even using a single Horizontal/Vertical relay, you have a moonbounce package

that can outperform larger, linear arrays. Additional relay switching providing 4 different types of signals. Losses from spe-

cial polarity and Faraday rotation virtually disappear. EME reliability approaches 100%. M2's new 2MXP20 antennas,

power dividers and phasing lines (using Times' new light-weight, low-loss LMR400 and/or LMR600 cable) coupled with ‘T’

brace kits, fiberglass H-frame packages, OR2800P Azimuth Rotator, and our New MT-1000 Elevation Motor provide the

building blocks for a whole new generation of high performance EME arrays.

SPECIFICATIONS:

*Subtract 2.14 from dBi for dBd

2MXP20 4 Bay Array

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

and locknuts to join sections. Sections are swaged to fit each other.

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

HORIZONTAL reflector (longest) element 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 SHAFT RETAINERS yet. This is

easier to do after all the HORIZONTAL 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 HORIZONTAL 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, used for securing the elements, should always be used for

permanent and long term antenna installations. 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, hold the elements quite securely.

Begin installing the stainless shaft retainers. Use thumb and index finger to hold a Shaft Retainer

2MXP20 ASSEMBLY MANUAL

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 M2“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. M2can provide low loss LMR400 or LMR600

phase lines and 4 port power dividers.

M2ANTENNA SYSTEMS, INC.

4402 N. SELLAND AVE.

FRESNO, CA 93722

(559) 432-8873 FAX: 432-3059

www.m2inc.com Email: [email protected]

2MXP20 ASSEMBLY MANUAL

2MXP20 DIMENSION SHEET

2MXP20 (FM 145-148) DIMENSION SHEET

40.125

38.625

36.813

36.00

35.50

35.125

34.625

34.375

34.50

35.188

VERTICAL

ELEMENT

DIMENSIONS

FOR FM BAND

14-148 MHZ

DESCRIPTION QTY

BOOM, 1.0 X .058 X 51” ALUM. TUBE................................1

BOOM, 1.0 X .058 X 45.5” ALUM. TUBE............................. 1

BOOM, 1-1/4 X .058 X 60 SOE, ALUM................................2

BOOM, 1-1/2 X .058 X 60 SBE ALUM. ................................1

BOOM TO MAST PLATE, 3/16 X 4 X 6” .............................. 1

TURN BUCKLE PLATE, 1/8 X 2 X 4” (M2APT0102)...........1

‘T’ MATCH BLOCK ASSEMBLY ..........................................2

BALUN CABLE RG-6U, HALF WAVE..................................2

DACRON, 3/32” X 20 FT.....................................................1

ELEMENT, 3/16 X SEE DIMENSION SHEET....................20

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

HARDWARE BAG #1

U-BOLT AND CRADLE, 2”...................................................3

U-BOLT AND CRADLE, 1-1/2”............................................. 5

HARDWARE BAG #2

NUT SEAL............................................................................ 4

BUTTON INSULATOR, 3/16” POLY ..................................40

KEEPER, 3/16” SS............................................................. 44

TURNBUCKLE, 1/4”............................................................. 2

NUT, 5/16-18 SS................................................................ 10

LOCKWASHER, 5/16” SPLIT RING SS............................. 10

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

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

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

SET SCREW, 8-32 X 1/4” SS............................................... 8

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

SHORTING BLOCK .............................................................4

U-CLIP, 3/16” ROD ..............................................................2

NYLON TIE, (MEDIUM) .......................................................4

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

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

2MXP20 FM KIT

ELEMENT, 3/16 X SEE DIMENSION SHEET....................10

KEEPER, 3/16” SS............................................................. 22

M2ANTENNA SYSTEMS, INC.

4402 N. SELLAND AVE.

FRESNO, CA 93722

(559) 432-8873 FAX: 432-3059

www.m2inc.com Email: [email protected]

2MXP20 PARTS & HARDWARE

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