M2 Antenna Systems 420-50-11 Bedienungsanleitung

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

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

REV A

Model .........................................420-50-11

Frequency Range.......................420 To 450 MHz

*Gain ..........................................13.44 dBi

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

Beamwidth ...............................E=34° H=43°

Feed type ...................................Folded Dipole

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

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

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

Power Handling..........................1 kW

Boom Length / Dia......................60” / 1”

Maximum Element Length..........13-3/4”

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

Stacking Distance.......................34” High & 36” Wide

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

Wind area / Survival...................0.6 Sq. Ft. / 100 MPH

Weight / Ship Wt.........................4 Lbs. / 6 Lbs.

M2 Antenna Systems, Inc.

Model No: 420-50-11

SPECIFICATIONS:

*Subtract 2.14 from dBi for dBd

FEATURES:

The 420-50-11 has been computer designed to cover the entire amateur 70 CM band. It is ideal for repeater link-

ing or any point to point application. Comparing it to a common reference, the KLM 420-450-11, it has the same usable

bandwidth with a full one dB more gain and the pattern is much cleaner. Clean patterns in most applications provide more

reliable communications with less intermod. An optional stacking harness is available when more than one antenna is

required for reduced beamwidth or additional gain. Because the antenna covers the whole band, many users find it a nat-

ural for ATV and general repeater use. Users are surprised by the performance of this compact but potent antenna.

Construction is classic M2for long term electrical and mechanical integrity. Elements are 3/16” 6061-T6 rod,

mounted through the boom on UV stabilized insulators and locked in place with stainless steel shaft retainers. The driven

element module is CNC machined and all connectors O-ring sealed. Internal connections are encapsulated in a space-

age silicone gel with nearly 4 times the dielectric strength of air. Balun connectors are triple-sealed to the coax.

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

wrenches / sockets, measuring tape.

1. This antenna uses a one-piece boom. A factory installed 7/8” x 29” sleeve provides additional

boom strength for rear mounting the antenna. Check that sleeve is in position, flush with rear end

of boom and all holes are aligned with boom.

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

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 internal locking “KEEPERS” 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. Install the stainless steel SHAFT RETAINERS to secure the elements. NOTE: For portable or

temporary use of the antenna, the retainers may be left off. The button insulators, normally a tight

fit, hold the elements quite securely.

To install, use thumb and forefinger to hold the retainer over the end of the PUSH TUBE ( 3/8" x 3"

420-50-11 ASSEMBLY MANUAL

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, push retainer completely off the element, and start over. Install

another retainer to the opposite side of the element. Continue installing retainers until all elements

are locked in place.

6. Mount the DRIVEN ELEMENT BLOCK to the boom using a single 8-32 X 1-1/4" screw and lock

washer. Orient the block with type “N” feed connector facing to the rear and balun connectors

facing to the front. Block orientation may be reversed if you wish to center mount antenna.

7. Attach balun and tighten the connectors gently using a 7/16" 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 1/8” 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 the rear of the boom using 1" U-bolts and the

stainless locknuts provided. DO NOT OVER TIGHTEN. 2” U-bolts, cradles, and stainless hardware

are provided for mounting the antenna to your mast. Secure feed coax to boom and mast with

harness ties.

10. MOUNTING

THIS ANTENNA CAN BE REAR MOUNTED IN ANY POLARITY TO ANY TYPE OF 2” MAST.

IF YOU PLAN TO CENTER-MOUNT THE ANTENNA PLEASE FOLLOW THE GUIDELINES

BELOW:

Maintain good VSWR and pattern: Keep metallic masts, cross booms and the feed coax out of the

element plane.

FOR HORIZONTAL POLARIZATION, the antenna may be center-mounted to a metallic vertical mast

or a horizontal NON-METALLIC cross boom (no conductive material in element plane). If mounted

to a horizontal cross boom, route the feedline forward to the boom-to-mast plate, loop down at

right angles to the element plane, and bring back to cross boom at least 6” beyond element tips.

FOR VERTICAL POLARIZATION, the antenna may be center-mounted to a NON METALLIC

VERTICAL MAST (no conductive material in element plane) or a horizontal metallic cross boom. If

mounted to a vertical mast, route the feed line forward to the boom-to-mast plate, loop out at a

right angle to the boom, and bring down to the mast at least 6 inches BELOW THE ELEMENT

TIPS. The feedline may also exit at the rear of the boom and loop back to the mast.

Stacking? Call M2and let us help you DO IT RIGHT

THIS COMPLETES THE ANTENNA ASSEMBLY.

DESCRIPTION QTY

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

420-50-11 ASSEMBLY MANUAL

420-50-11 DIMENSION SHEET

SLEEVE, 7/8 X .058 X 29” (factory installed).... 1

ELEMENTS, 3/16 ROD x Dimension Sheet...... 11

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

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

BOOM-TO-MAST PLATE, .188 X 3” X 4”........ 1

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

U-BOLT, 1” ....................................................... 2

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

IN HARDWARE BAG:

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

BUTTON INSULATORS................................... 22

KEEPER, SS .................................................... 22

NUT, 5/16-18 SS .............................................. 4

LOCK WASHER, 5/16 SS................................. 4

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

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

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

LOCK WASHER, #8 SS.................................... 1

CABLE TIE, NYLON ........................................ 2

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

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

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]

420-50-11 PARTS & HARDWARE

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