M2 Antenna Systems 440-18X 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
©2015 M2 Antenna Systems Incorporated 05/22/21
Rev.01
Model .........................................440-18X
Frequency Range.......................420 To 450 MHz
*Gain ..........................................16.5 dBi
Front to back ..............................24 dB Typical
Beamwidth ...............................E=27° H=32°
Feed type ...................................Folded Dipole
Feed Impedance. .......................50 Ohms Unbalanced
Maximum VSWR........................1.5:1 Average
Input Connector..........................“N” Female
Power Handling ..........................1.5 kW
Boom Length / Dia......................135”’ / 1” To 3/4”
Maximum Element Length..........14”
Turning Radius: ..........................69’
Stacking Distance.......................51” High & 52” Wide
Mast Size....................................2”
Wind area / Survival ...................0.68 Sq. Ft. / 100 MPH
Weight / Ship Wt.........................5 Lbs. / 7 Lbs.
M2 Antenna Systems, Inc.
Model No: 440-18X
FEATURES:
M2 is always trying to design and build new antennas to fit the needs of amateur radio operators. The “X” series of antennas are all designed
to keep the packaging under 48” long to minimize oversize surcharges applied by shippers. The “X” series antennas offer the same performance as its
predecessor, but with shorter boom sections. The boom sections also have a thicker wall for added strength. A side benefit of the “X” series antennas
are that they are more portable with the smaller sections.
The 440-18X replaces our very popular 440-18. The 440-18X is a computer optimized broadband yagi featuring an excellent pattern and good
gain across its bandwidth. It can be mounted vertically or horizontally and is ideal for stacking two or more for additional gain. Its light weight yet sturdy
construction keep the cost low and the performance high. Use it for ATV, OSCAR, FM, LONG HAUL TROPO, ETC. We guarantee you will be im-
pressed.
The heart of the 440-18X is a unique Driven Element Module with superior weather resistance and power handling abilities. All connectors are
O-ring sealed to the CNC machined block and internal connections are sealed in a space-age silicone gel with a dielectric strength nearly 4 times
greater than air. The Balun coax connectors are triple O-ring sealed. Other key mechanical and electrical parts are CNC machined from 6061-T6 alumi-
num and all hardware except U-bolts is stainless steel.
The 440-18X offers you uncompromising performance, enduring mechanical construction, and long term electrical integrity.
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 sections. Sections may be swaged to fit each other or use short internal splice sections.
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. 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
or installed on one side only. 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 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). It is a good idea to install the second
SHAFT RETAINER after final testing.
6. Mount the DRIVEN ELEMENT BLOCK to the boom using a single 8-32 X 1-1/4" screw and lockwasher.
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.
440-18X ASSEMBLY MANUAL
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 balance point, approximately 52” from the rear . 1" 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 balancing the boom and mounting the plate.
10. INSTALLATION, TESTING & STACKING INFORMATION
A. To protect your investment in this high performance antenna, always use high quality coax and
connectors. Old, corroded, or poor quality materials are common sources of serious performance losses.
B. Test the antenna, connectors and feedline, 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 close to “spec” across the rated
bandwidth. When satisfied, add the second SHAFT RETAINERS as described in step 5.
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 1/2 wavelength in order to maintain
equal phasing in the array. Improper phasing can severely deteriorate performance.
4. As a general rule, you never want to have metallic structures, such as a mast or feed lines parallel to the
elements unless it is behind the reflector. Having a metallic structure in the same plane as the elements in
front of the reflector element can cause VSWR problems and or skewed patterns.
FOR HORIZONTAL POLARIZATION, the antenna may be mounted to a METALLIC vertical mast or a
horizontal NON-METALLIC cross boom. If mounted to a horizontal cross boom, route the feedline forward to
the boom-to-mast plate, loop down, and bring back to cross boom at least 6” beyond element tips. Antennas
are typically stacked one above the other in horizontal polarity. SEE SPEC SHEET FOR STACKING
DISTANCE. See Stacking Reminders.
FOR VERTICAL POLARIZATION, the antenna may be mounted to a NON METALLIC VERTICAL MAST or
a horizontal METALLIC cross boom. If mounted to a NON METALLIC vertical mast, turn the driven element
180 degrees so the feed line and “N” connector is facing to the rear of the antenna. Route the feed line to
the rear of the antenna, keeping 4” to 6” behind the reflector element. Let the cable droop at least 6 inches
BELOW THE VERTICAL ELEMENT TIPS. Re-attach the feed line to the mast below the element tips. A
simple structure can easily be fabricated if you want something to support the feed line. See M2 “L” brace kit
for ideas. Vertically polarized Antennas are typically stacked side by side on a horizontal cross boom. See
Stacking Reminders.
If you are unsure about stacking multiple antennas, please call M2 and let us help you DO IT RIGHT! Visit
our website, https://www.m2inc.com/blog/ for other tips.
Stacking? Call M2and let us help you DO IT RIGHT
THIS COMPLETES THE ANTENNA ASSEMBLY.
CAREFULLY MANUFACTURED BY:
M2 ANTENNA SYSTEMS, INC.
4402 N. Selland Ave.
Fresno, CA 93722
(559) 432-8873 Fax: 432-3059
www.m2inc.com Email: sales@m2inc.com
440-18X ASSEMBLY MANUAL
440-18X DIMENSION SHEET
BTM PLATE POSITION
ANTENNAS CENTER OF BALANCE
52.00” FROM THE REAR OF ANTENNA
440-18X PARTS & HARDWARE
DESCRIPTION QTY
BOOM SECTION, 1 X .065 X 37-3/4” SOE(M2ABS44018X-1)....................1
BOOM SECTION, 1 X .065 X 37-3/4” SOE(M2ABS44018X-2)....................1
BOOM SECTION, 1 X .065 X 37-3/4” SOE(M2ABS44018X-3)....................1
BOOM SECTION, 3/4 X .049 X 27-3/4”(M2ABS44018X-4) .........................1
ELEMENTS, 3/16 ROD x DIMENSION SHEET ...........................................18
DRIVEN ELEMENT ASSEMBLY(SADEA432UHF1)....................................1
BALUN, RG-6 1/2 WAVE(SABL70CM) ........................................................1
BOOM-TO-MAST PLATE, .188 X 3” X 4”(M2APT0019) .............................1
U-BOLT AND CRADLE, 2”...........................................................................2
U-BOLT, 1”...................................................................................................2
ASSEMBLY MANUAL..................................................................................1
IN HARDWARE BAG:
SHORTING BAR(M2ASB0080) ...................................................................2
BUTTON INSULATORS...............................................................................36
KEEPER, SS................................................................................................36
NUT, 5/16-18 SS..........................................................................................4
LOCKWASHER, 5/16 SS .............................................................................4
NUT, 1/4-20 SS............................................................................................4
LOCKWASHERS, 1/4 SS.............................................................................4
SETSCREW, 8-32 X 1/4, SS........................................................................4
SCREW, 8-32 X 1-1/4 SS ............................................................................7
LOCKNUT, 8-32 SS .....................................................................................6
CABLE TIE, NYLON ....................................................................................3
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: 432-3059
www.m2inc.com Email: [email protected]
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