M2 Antenna Systems 23CM22EZB Manual de usuario

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

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

Rev.02

Model ......................................... 23CM22EZB

Frequency Range ....................... 1250 To 1300 MHz

*Gain .......................................... 18.2dbi 1290-1300 MHz

Front to back .............................. 28 dB Typical

Beamwidth ............................... E=24° H=24°

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

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

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

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

Power Handling .......................... 600 Watts

Boom Length / Dia ...................... 70” / 0.50”

Maximum Element Length .......... 4.5”

Turning Radius: .......................... 68”

Stacking Distance ....................... 23” High & 23” Wide

Mast Size .................................... 1-1/4” to 2” Nom.

Wind area / Survival ................... 0.3 Sq. Ft. / 100 MPH

Weight / Ship Wt. ........................ 2 Lbs. / 3.5 Lbs.

M2 Antenna Systems, Inc.

Model No: 23CM22EZB

SPECIFICATIONS:

*Subtract 2.14 from dBi for dBd

FEATURES:

The 23CM22EZB is a revised version of our popular and proven 23CM22EZ. The 23CM22EZB now supports rear and

center* mounting (*with some restrictions). While rear mounting is the preferred mounting method, center mounting pro-

vides mounting flexibility for more compact installations or rovers. The element sets are laser cut, holding spacing and

element lengths to .003” tolerance. Each antenna performs as perfectly as the next and the gain tops any other antenna

of comparable boom length. With excellent directivity and a very clean pattern, it is perfect for high gain stacked arrays.

Vertical stacks provide the gain of a much larger antenna with a smaller turning radius and without reducing the azimuth

beam width. Applications are long haul tropo, EME, ATV, Repeater, Rover and satellite operations. The 'EZ' is handy for

‘hill-topping’ and portable uses because of its modest size, weight, simple construction and rear mounting.

Structurally, the 23CM22EZB elements are fabricated in just TWO sets, eliminating ALL measurement and assembly

errors. The Broad band folded dipole driven element design is unique, with a balun and matching inside the folded dipole

itself. External connections are limited to a single O-ring sealed “N” feed. Internal connections are sealed in a machined

and aluminum brazed housing. When other designs are deteriorating from environmental factors, the '23CM22EZB will

still be as good as new and performing to 'spec'!

23CM22EZB ASSEMBLY DETAIL

UNI-CRADLE & U-BOLT

& 1/4-20 NUT AND

LOCKWASHER

FITS FROM 1 1/4 DIA

TO 2.0 DIA MAST

DRIVEN ELEMENT ASSEMBLY

MOUNTS USING THE FORWARD

HOLE WITH THE ACCESS

CAP FORWARD

BOOM SECTION#2

BOOM SECTION#1

ELEMENT SECTION#2

ELEMENT SECTION#1

SCREW, 8-32 X 7/8

MOUNTS DRIVEN

ELEMENT ASSEMBLY

SCREW, 8-32 X 1”

MOUNTS REAR

MAST BRACKET

SCREW, 6-32 X 1.0”

AND LOCKNUTS

(9 PLC.)

23CM22EZB CENTER MOUNT OPTION

NOTE THE DISTANCE

FROM THE TOP OF

THE MAST TO THE

ELEMENTS

When using the center mount option keep the top of the mast as far from the antenna boom as

the U-bolts allow. Do not allow the mast to pass up through the element plane as it WILL

CAUSE GREAT PERFORMANCE DEGRADATION.

23CM22EZB TUNNING DETAIL

COMMENT: The dipole is fabricated with the dipole straight up so the mounting screw can be

inserted and tightened and for best match. If you have good VSWR measurement equipment,

using this tipping method to optimize the match at the frequency of choice. A good match (well

under 1.5:1) will occur from 1250 to 1300 mHz. Place the screwdriver as shown and in about the

middle of each element half to make the bend, making small bends and checking VSWR as you

go is recommended

(see the drawing). Looking from the rear, the LEFT SIDE OF THE DIPOLE IS NORMALLY A

SOLID 1/4” ROD and is quite stiff. The other half of the dipole is soft aluminum tubing and bends

quite easily. Alternate back and forth until the dipole slants forward or back to achieve the desired

VSWR

Attach the feedline and route towards the boom to mast bracket. Secure at regular intervals with

cable ties. 2" U-bolts and uni-cradles are supplied for attaching to mast sizes 1 1/4 to 2” dia.

When using the center mount option keep the top of the mast as far from the antenna boom as

the U-bolts allow. Do not allow the mast to pass up through the element plane as it WILL CAUSE

GREAT PERFORMANCE DEGRADATION.

GENERAL COMMENTS. It is always a good idea to check out the antenna with a little RF prior

to installing it in some inaccessible location. DO NOT use any PL-259 fittings or adapters at

these frequencies. Very small problems in coax and in connectors can cause MAJOR VSWR

problems. Even a loose connector will affect the VSWR noticeably.

Be sure to use good quality feedline. We recommend Times LMR-400 or larger coax. For long

runs of 50 feet or more, 7/8” hard line is highly recommended. For higher gain, these antennas

can be stacked. Stacking one above the other WILL NOT narrow the azimuth beamwidth which

is already narrow. M2 can supply phasing lines and power dividers and structures for your stack-

ing requirements. We can also supply technical information to make sure you optimize your sys-

tem

COMPLEX PHASING TECHNIQUES

EXPLAINED

When phasing antenna arrays, there are some standard

rules, such as: “all antennas need to mount identically not

mirror image” and “phasing lines need to be ALL EVEN or

ALL ODD halfwave multiples”. These are good basic rules.

There are situations however, where reduced phasing line

length and routing simplicity can be important but it may re-

quire different antenna mounting parameters.

In the case of the 23CM22EZA, rear mounting reduces phas-

ing line length and mounting mirror image makes it even bet-

ter. Mounting mirror image normally puts the two antennas

180 degrees out of phase because one driven element is ro-

tated by 180 degrees with respect to the other. We give you

two mounting holes that allows you to swap ends of the driv-

en element and there by taking the 180 phase shift back out

of the phasing system.

To be sure your array ends up all “in phase” do the following:

1. Lay all the driven elements side by side with the connect-

ors pointing away from you and the Access caps up.

2. With a permanent marking felt pen, make a band of black

on the RIGHT end of each driven element.

3. Mount the driven elements on the antennas so all the

black bands end up on the RIGHT side of the array. And

the access caps are as shown.

4. Be sure they are now all the same distance from the rear

element. This is what the second hole if for.

5. Keep all the phasing lines equal length between pairs of

antennas. That is it. You are now in phase.

Phasing line kits available for most popular stacking tech-

niques. If in doubt, do it right and call M2 for stacking and

phasing info.

Access cap

23CM22EZB ASSEMBLY MANUAL

DESCRIPTION QTY

BOOM SECTION #1, 1/2 X 37.125” ........................................... 1

BOOM SECTION #2, 1/2 X 31.875” ........................................... 1

ELEMENT SET #1, REAR .......................................................... 1

ELEMENT SET #2, FRONT ....................................................... 1

DRIVEN ELEMENT ASSY (SADEA23CM) ................................. 1

REAR MOUN BRACKET (M2APT0058) ..................................... 1

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

HARDWARE BAG ..................................................................... QTY

BOOM COUPLING (M2ASR0150) ............................................. 1

UNI-CRADLE,(M2AMC0070) ..................................................... 2

U-BOLT, 2 SS” (HINDLEY) ......................................................... 2

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

LOCKWASHER, 1/4”, SS ........................................................... 4

SCREW, 8-32 X 1” ..................................................................... 2

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

LOCKNUT, 8-32 ......................................................................... 2

LOCKWASHER, 8-32, SS .......................................................... 1

SCREW, 6-32 X 1” ..................................................................... 9

LOCKNUT, 6-32, SS .................................................................. 9

M2 ANTENNA SYSTEMS, INC.

4402 N. Selland Ave.

Fresno, CA 93722

(559) 432-8873 Fax: 432-3059

www.m2inc.com Email: [email protected]

23CM22EZB PARTS & HARDWARE

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