M2 Antenna Systems 23CM22EZB User manual

M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722
Tel: [phone] Fax: [phone] Web: www.m2inc.com
©2015 M2 Antenna Systems Incoporated 04/29/20
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
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
[phone] Fax: [phone]
www.m2inc.com Email: [email protected]
23CM22EZB PARTS & HARDWARE