M2 Antenna Systems, Inc.
Model No: 436CP16
SPECIFICATIONS:
Model ......................................... 436CP16 Power Handling ..........................1 kW
Frequency Range ....................... 432 To 438 MHz Boom Length / Dia ......................65-3/4” / 1”
*Gain .......................................... 13.3 dBic Maximum Element Length..........13-3/4”
Front to back .............................. 15 dB Typical Turning Radius: ..........................64”
Beamwidth ............................... 42° Circular Stacking Distance .......................36”
Feed type ................................... Folded Dipole Mast Size ....................................1-1/2” to 2” Nom.
Feed Impedance. ....................... 50 Ohms Unbalanced Wind area / Survival ...................0.4 Sq. Ft. / 100MPH
Maximum VSWR ........................ 1.5:1 Weight / Ship Wt. ........................4 Lbs. / 7 Lbs.
Input Connector .......................... “N” Female
*Subtract 2.14 from dBi for dBd
FEATURES:
The 436CP16 is a light weight, circularly polarized antenna optimized for Low Earth Orbit (LEO) satellite
communications or other applications where a small circular polarized antenna is required. Optimum match and gain are
between 432 & 440 MHz for the satellite band. Rear mounted for easy coaxial cable routing. A preamp can be mounted
close to the antenna for almost no coax loss before the preamp, maximizing your receive performance. Computer design
techniques help keep spurious side lobes low down for optimum signal to noise ratios. This antenna features the same
CNC machined, O-ring and silicone-gel sealed, driven element assemblies common to all M2 Yagi antennas. This insures
years of trouble free performance regardless of weather.
M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722
Tel: (559) 432-8873 Fax: (559) 432-3059 Web: www.m2inc.com
0725/19
©2016 M2 Antenna Systems Incorporated Rev.04
436CP16 DIMENSION SHEET
436CP16 ASSEMBLY MANUAL
TOOL REQUIRED FOR ASSEMBLY: Screwdriver, 11/32 nut driver or wrench, 7/16” and1/2” socket or
end wrenches, measuring tape.
1. Locate boom sections #1 & #2.
ASSEMBLING THE HORIZONTAL ELEMENTS
2. Lay out the elements by “H” length and position as shown in the DIMENSION SHEET. Start with
the reflector (longest) element. Balance it on your finger to find rough center and push on a black
button insulator to about 1/2” off center. Push the element through the hole in the boom and install
the second button, snugging it up into boom. DO NOT BOTHER CENTERING the element at this
time and DO NOT INSTALL the stainless steel shaft retainers yet. It is easier to do it 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 DIRECTORS. Note that the Director Elements MAY 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, within 1/32", 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. Correct any obvious misalignments.
5. Stainless steel SHAFT RETAINERS lock the elements in place. They should always be used for
permanent and long term antenna installations. For portable or temporary use, the button
insulators are adequate for holding the elements and the retainers may be left off.
To install the stainless steel SHAFT
RETAINERS, use thumb and forefinger to
hold the retainer over the end of the PUSH
TUBE (3/8" x 3" 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 secured.
6. Mount the HORIZONTAL DRIVEN ELEMENT BLOCK / ROD ASSEMBLY to the TOP of the boom
using a single 8-32 X 1-1/4" screw. Orient the block with the two balun connectors facing to front.
7. Install the 8-32 x 1/4” set screws (internal Allen head - tool supplied) into the SHORTING BARS.
Slide the bars onto the 1/8" Driven Element Block Rods and the 3/16" driven element rod. Position
the Shorting Bars as shown on the Dimension Sheet, with the given dimension between the outer
face of the driven element block and the inner face of the shorting bar. Align the bars with each
other and tighten the set screws.
ASSEMBLING THE VERTICAL ELEMENTS
8. Repeat steps #2 through #5 to install the Vertical elements, using the Dimension Sheet as your
guide to lengths and spacing. Note: The vertical element set is shifted forward on the boom by 1/4
wavelength. This increases isolation between element planes, improving circularity and ease of
phasing / matching the two element sets.
436CP16 ASSEMBLY MANUAL
9. INSTALLATION OF THE VERTICAL DRIVEN ELEMENT BLOCK DETERMINES THE
CIRCULARITY OF THIS ANTENNA. THE ORIENTATION OF THE BLOCK FOR RHC - RIGHT
HAND CIRCULARITY, IS SHOWN ON THE DIMENSION SHEET AND DRAWING AND
DESCRIBED BELOW:
Viewed from the rear of the boom (rearmost Reflector HORIZONTAL), the VERTICAL Driven
Element Block mounts to the RIGHT hand side of the boom with the two Balun connectors
oriented to the FRONT. Secure with 8-32 x 1-1/4” screw. Install the Shorting Bars as in step #7.
D.E. BLOCK
JUNCTION BLOCK
SCREW, 8-32 X 1-1/4”
PHAS LINE D.E. BLOCK
1/4 WAVE SCREW, 8-32 X 1-1/4”,SS
D.E. BALUN
PHASE LINE
3/4 WAVE D.E. BALUN
10. Install JUNCTION BLOCK to boom with 8-32 x 1-1/4" screw. Depending on model, orientation of
block may vary from drawing - see Dimension Sheet for exact placement. Attach Baluns and
Phasing lines to the Driven Element Blocks and Junction Block as shown in the picture. Tighten
the ‘F’ connectors gently using a 7/16" end wrench. Depending on model and polarity, the Vertical
balun may loop around another element. This is normal. Form balun coax until it is close to the
boom and secure with a nylon cable tie. Also secure the other balun and the matching / phasing
harness coax with cable ties. Ties should be snug but not crushing or kinking the coax.
11. Use good quality coax and “N” connector for your feedline (see Installation Tips). Secure feed coax
near connector on Junction Block, to provide stress relief. Allow coax to hang in a loop between
the rear end of the boom and the reattachment point (at least 12” beyond element tips) on the
mast or cross boom. Do not route feed line to boom to mast plate as exiting antenna here will
adversely affect circular field.
436CP16 ASSEMBLY MANUAL
12. The boom to mast plate is at the REAR of the boom. Use two 1" U-bolts and the stainless nuts and
lock washers provided. DO NOT OVER TIGHTEN. 2” U-bolts (and stainless steel nuts /
lockwashers) are provided for mounting the antenna to your mast or cross boom, other sizes are
available upon request.
INSTALLATION TIPS
13. A circular polarized antenna creates fields in all planes or polarities. Performance
DETERIORATES SIGNIFICANTLY if it is CENTER MOUNTED on a metal (conductive) mast or
crossboom. A mast or crossboom of any NON-CONDUCTIVE material can be used. Fiberglass is
the prime choice for its strength and weather resistance. Mount the antenna so that element tips
are at least 12” from any conductive material (mast, tower, feedline, etc.).
14. Try to keep the cable run to under 100 ft. to prevent excessive signal loss.
Recommended feedlines, in order of preference:
Andrews or Celwave 1/2” hardline
Times LMR400 or Belden 8214
15. To maintain proper phasing when stacking two or more antennas, mount each with the same
orientation of Driven Element Blocks. DO NOT MOUNT IN MIRROR IMAGE. See the Specification
Sheet for stacking distances. For more detailed stacking information contact M2.
THIS COMPLETES THE ANTENNA ASSEMBLY.
M2 ANTENNA SYSTEMS, INC.
4402 N. Selland Ave.
Fresno, CA 93722
(559) 432-8873 Fax: 432-3059
www.m2inc.com Email: sales@m2inc.com
436CP16 PARTS & HARDWARE
DESCRIPTION QTY.
Boom Section #1, 1 x .058 x 36" SOE ................................ 1
Boom Section #2, 1 x .058 x 35-1/4" .................................. 1
Elements, 3/16" alum. rod x (see dims.) ............................. 16
Driven Element Assembly .................................................... 2
Junction Block Assembly (SADE0065) ................................ 1
Balun Cable, RG6-U 1/2 Wave ............................................ 2
Phase Line Cable, RG6-U 3/4 Wave ................................... 1
Phase Line Cable, RG6-U 1/4 Wave ................................... 1
Shorting bars, .75 x 1.532 x .250" (M2ASB0080) ............... 4
Boom to mast plate, 3 x 4 x .125" (M2APT0019) ................. 1
U-bolt and cradle, 1-1/2” ...................................................... 2
U-bolt, 1" ............................................................................. 2
Assembly instructions ......................................................... 1
IN HARDWARE BAG
Button insulators, 3/16" black ............................................. 32
Shaft Retainers, 3/16" ss ..................................................... 32
Nut, 5/16-18 ss .................................................................... 4
Lockwasher, 5/16" ss ........................................................... 4
Screw, 8-32 x 1-1/4" panhead ss ........................................ 5
Set screw, 8-32 x 1/4" ss .................................................... 8
Locknut, 8-32, ss ................................................................. 2
Nuts, 1/4-20 ss ..................................................................... 4
Lockwasher, 1/4-20 ss ........................................................ 4
Allen wrench, 5/32" ............................................................. 1
Push tube, 3/8 x 3" (for keeper installation) ......................... 1
Cable ties, 8"........................................................................ 5
M2 ANTENNA SYSTEMS, INC.
4402 N. Selland Ave.
Fresno, CA 93722
(559) 432-8873 Fax: 432-3059
www.m2inc.com Email: sales@m2inc.com
