M2 Antenna Systems 140CP14M 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 Incorporated 09/11/15
Rev.01
Model .........................................140CP14M
Frequency Range.......................135 To 144.5 MHz
*Gain ..........................................12.53 dBi
Front to back ..............................19 dB Typical
Feed type ...................................Folded Dipole
Feed Impedance........................50 Ohms Unbalanced
Maximum VSWR........................1.5:1
Input Connector..........................“N” Female
Power Handling..........................1.5 kW
Boom Length / Dia......................134” / 2”
Maximum Element Length..........43”
Turning Radius:..........................71”
Stacking Distance.......................92” HIGH—96” WIDE
Mast Size....................................2” Nom.
Wind area / Survival...................1.0 Sq. Ft. / 100MPH
Weight / Ship Wt.........................6 Lbs. / 10 Lbs.
M2 Antenna Systems, Inc.
Model No: 140CP14M
FEATURES:
The 140CP14M is high performance circular polarized antenna with a remarkably clean pattern. The pattern is important
in order to match the antenna’s noise temperature with modern low noise preamps. This antenna is ideal for satellite work
but is also excellent for terrestrial uses like long haul tropo communications.
The CNC machined driven element module is O-ring sealed and weather tight for low maintenance and long-term
peak performance. Internal connected are encapsulated in a space-age silicone gel that seals out moisture and improves
power handling. The 3/8” 6061-T6 rod elements are centered on the boom to minimize interaction and maintain good el-
lipticity. Insulators are UV stabilized and locked in place with stainless keepers. Rugged construction, uncompromising
performance for the boom length: that’s the M2140CP14M!
SPECIFICATIONS:
*Subtract 2.14 from dBi for dBd

TOOLS REQUIRED FOR ASSEMBLY: flat and Phillips screwdriver, 7/16 and 1/2" end wrench , small
pliers, measuring tape.
NOTE: THIS CIRCULAR POLARIZED ANTENNA IS MADE UP OF TWO IDENTICAL SEVEN
(7) ELEMENT YAGI ANTENNAS THAT MOUNT IN OPPOSITE PLANES ON THE BOOM. ONE YAGI
IS SHIFTED A QUARTER WAVELENGTH (90 DEGREES) AHEAD OF THE OTHER ON THE BOOM
AND THEN THE TWO ARE PHASED AND MATCHED TOGETHER TO PRODUCE EITHER RIGHT
OR LEFT HAND CIRCULAR POLARITY. THESE INSTRUCTIONS WILL DESCRIBE ASSEMBLY
FOR RIGHT HAND CIRCULAR POLARITY.
1. Use a screwdriver to slightly spread the fingers on two 2” RING CLAMPS and slide them
onto rear of boom. Position about 64” from rear. Install a 1/4-20 x 1” bolt and locknut into
each clamp, but do not tighten at this time.
NOTE: IF MOUNTING ANTENNA TO H-FRAME, SLIDE
T-BRACE CLAMP ON THE BOOM BEFORE
INSTALLING ELEMENTS INTO BOOM.
2. MOUNTING THE REAR (HORIZONTAL) SET
OF ELEMENTS: Refer to the DIMENSIONAL DRAWING
for the length and locations of elements. Start with the
longest element, the REFLECTOR. Balance the 3/8”
Element over your forefinger to find the approximate
center. Slide on a black INSULATOR BUTTON to just
about 1" off center. Insert the element through the hole 1”
from the REAR of the boom and feed the small end of the
insulator into the hole until it bottoms on the insulator
shoulder. Add the second button insulator. DON'T
BOTHER WITH ACCURATE CENTERING YET.
3. Install the 3/8” HORIZONTAL DRIVEN ELEMENT as in step #2, above.
140CP14M ASSEMBLY MANUAL

4. Find the DRIVEN ELEMENT CONNECTOR BLOCK with the short 1/4” rod match elements.
Position it over the 1/4” hole slightly forward of the driven element. Orient so the 2 connectors in the
block are facing to the FRONT. Secure with a 1/4-20 x 2-1/4" bolt and lockwasher and tighten in
place. 5. Now install 5 horizontal DIRECTOR elements to boom.
6. Using a tape measure, carefully center each of the 7 installed elements by matching the
exposed element length on each side of the boom. After all horizontal elements are physically
centered, double check quickly for symmetry by sighting along the element tips from the rear of the
boom on each side and look for any differences. Correct if found.
7. NOTE: The SHAFT RETAINERS should always be used for permanent and long term
antenna installations. However, 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. The button insulators,
normally a tight fit, hold the elements quite securely.
To install the stainless steel element SHAFT RETAINERS, start by using thumb and forefinger
to hold the retainer against the end of the PUSH TUBE (3" gray PVC 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 on the element up against opposite button insulator,
will help maintain center reference. If you push the first retainer too far, remove element from boom
and push retainer completely off the element, then try again). Now repeat for the other side of the
element. Continue installing retainers until all seven elements are locked in place.
8. Install two 8-32 x 1/4” set screws (internal Allen head - tool supplied) into each of the
SHORTING BARS. Slide the bars onto the 3/8” rod driven element tips and 1/4” Driven Element Block
Rods. Position the Shorting Bars as specified on the Dimension Sheet: measurement is from the outer
face of the driven element block to the inner face of the shorting bar. Align the bars and rods with each
other and tighten the setscrews.
THIS COMPLETES THE ASSEMBLY OF THE HORIZONTAL YAGI MODULE EXCEPT FOR
ADDING THE COAX BALUN AND THE MATCHING / PHASING HARNESS.
9. Now install the (VERTICAL) yagi element set. The longest element (REFLECTOR) mounts
forward of, and perpendicular to the first horizontal director already in position. Install as IN STEP #2.
10. Install the vertical 3/8” driven element.
11. CONSTRUCTION FOR RIGHT HAND CIRCULAR POLARITY: The installed position of
the VERTICAL DRIVEN ELEMENT BLOCK on the boom is critical to proper circularity. Using the
HORIZONTAL elements and the ASSEMBLY DRAWING as a reference, orient the boom so the
rearmost reflector is horizontal and the horizontal driven element block is on top of the boom.
LOOKING AT THE ANTENNA FROM THE REAR, MOUNT THE VERTICAL DRIVEN ELEMENT
BLOCK ON THE LEFT HAND SIDE OF THE BOOM, ORIENTING THE TWO CONNECTORS TO
THE FRONT. See the Hardware dwg. Secure with 1/4-20 x 2-1/4” bolt and lockwasher. Install the
Shorting Bars as in step #8.
For Left hand Circularity, mount the block to the LEFT-hand side of the boom with the two
connectors to the front.
12. Now continue installing the DIRECTORS as before. Center the elements and add the
retainers. THIS COMPLETES THE SECOND YAGI (VERTICAL).
140CP14M ASSEMBLY MANUAL

13. Install the “T” BLOCK to the 1/4” boom hole between the two driven elements. Position on
the OPPOSITE side of boom as the forward driven element, “N” connector facing to rear. Secure with
a 1/4-20 x 2-1/4” bolt and lockwasher.
14. Before installing the Baluns and Matching / Phasing Harness, thread 3/8” SEAL NUTS fully
onto all small connectors, with the black Neoprene side of the nuts facing out.
15. Attach Baluns and Phasing lines to the Driven Element Blocks and Junction Block as
shown on the Hardware Dwg. There is no polarity requirement for connections to "T" block and
phasing lines are of equal length - select best routing. Tighten the connectors gently using a 7/16" end
wrench. Once the connectors are tight, back the Seal Nuts out and finger-tighten firmly up against the
face of the connectors (or tighten gently with 1/2” end wrench). A lot of torque is unnecessary.
Depending on model and polarity, baluns may loop around or straddle an element in the opposite
polarity. This is normal. A balun that extends
beyond the boom end may be looped to shorten.
Form baluns and phasing lines close to the boom
and secure with nylon cable ties. Ties should be
snug but not crushing or kinking the coax.
16. For finding balance point of antenna,
attach the feedline, even temporarily, to the "N"
connector on the "T" Junction Block. Secure coax to
boom near connector to relieve stress. Route feed
coax to rear and secure to boom again between the
reflector and driven element. Allow about 60 inches
of cable to hang in a loop from the REAR of the
antenna before routing back to a mast or cross-
boom attach-point. Feedline should clear all
element tips and sides by al least 12”. This will
maintain top antenna performance and good
standing wave ratio.
17. Locate the BALANCE POINT of the
antenna and slide the 2” ring clamps, installed earlier, to that point. Install the BOOM TO MAST
PLATE to the clamps, long side to boom, using 1/4-20 x 1-1/4” bolts and locknuts. Two additional 2”
clamps and 1/4-20 hardware are supplied for installation to a 2” mast. Bolt to boom-to-mast plate on
opposite side from boom clamps. Loosely install 1/4-20 x 1” bolt and locknut in each set of clamp
fingers.
18. INSTALLATION TIPS: This antenna, when assembled as described above, creates a field
in all planes or polarities around the antenna. For this reason do not mount the antenna on a metal
mast or cross-boom. The performance will be severely reduced. A suitable 2” mast of any non
conductive material can be used. FIBERGLASS is the first choice because of its strength and
resistance to the weather and UV. Choose a nonconductive section long enough to keep the closest
element tip at least 12" from any metal mast, tower or feedline.
NOTE: CLAMPING TO THE 3” DIAMETER MAST IS DONE WITH PAIRS OF 3” MACHINED
SADDLE CLAMPS FACING EACH OTHER AROUND THE MAST AND SECURED WITH 1/4”-20 x 4”
BOLTS PASSING THROUGH BOTH SADDLE CLAMPS AND THE BOOM TO MAST PLATE.
THIS COMPLETES THE ANTENNA ASSEMBLY.
140CP14M ASSEMBLY MANAUL

140CP14M DIMENSION SHEET

DESCRIPTION.............................................................QTY
Boom, 2” x 133.625 x .125”, alum, .............................1
Element Rod, 3/8 alum. X See Chart ...........................14
Driven element block assembly....................................2
Junction block assembly (SADE0070) .........................1
Balun cable, RG-6U .....................................................2
Matching / phasing cable, RG-6U, 18.5" .....................2
Boom to mast plate, 4” X 6” X .250” (M2APT0030)......1
Rings clamp, 2” (M2AEC0190).....................................4
Shorting block, 1/4 x 3/4 x 2-3/16" (M2ASB0310)........4
Button insulators, black polyethelene, 3/8”...................30
Shaft Retainer, 3/8”, SS ...............................................30
Nut seal, 3/8-32 with neoprene face.............................8
Cable ties, 8" black nylon.............................................6
Assembly instructions...................................................1
IN HARDWARE BAG
1/4-20 x 2-1/4” bolt, SS ................................................3
1/4 Lockwasher SS ......................................................3
1/4-20 x 1” bolt SS........................................................12
1/4-20 locknut SS.........................................................12
Set screws 8-32 x 1/4" SS............................................8
Allen Wrench, 5/64” .....................................................1
Push tube, 5/8 for 3/8” Element Rods ..........................1
M2ANTENNA SYSTEMS, INC.
4402 N. Selland Ave.
Fresno, CA 93722
[phone] Fax: [phone]
www.m2inc.com Email: [email protected]
140CP14M PARTS & HARDWARE

DESCRIPTION.............................................................QTY
Driven element block assembly....................................2
Junction block assembly (SADE0070) .........................1
Shorting block, 1/4 x 3/4 x 2-3/16" (M2ASB0310)........4
Balun cable, RG-6U .....................................................2
Matching / phasing cable, RG-6U, 18.5" .....................2
Nut seal, 3/8-32 with neoprene face.............................8
Cable ties, 8" black nylon.............................................6
Penetrox / Zinc Paste...................................................1
Assembly instructions...................................................1
IN HARDWARE BAG
1/4-20 x 2-1/4” bolt, SS ................................................3
1/4 Lockwasher SS ......................................................3
Set screws 8-32 x 1/4" SS............................................8
Allen Wrench, 5/64” .....................................................1
M2ANTENNA SYSTEMS, INC.
4402 N. Selland Ave.
Fresno, CA 93722
[phone] Fax: [phone]
www.m2inc.com Email: [email protected]
140CP14M REFRESHER KIT