M2 Antenna Systems 40M3L User manual

8/17/11
Rev.00
Model ........................................40M3L
Frequency Range.......................7.0-7.3 MHz X 150 kHz
Gain............................................6.6 dBi
Front to back..............................23 dB
Beamwidth ...............................E=62°
Feed type...................................Hair pin match
Feed Impedance........................50 Ohms Unbalanced
Maximum VSWR........................1.3:1 typ. 2:1 max
Input Connector..........................SO-239, Other avl.
Power Handling..........................3 kW, Higher avl.
Boom Length / Dia......................29.5’ / 3.0 x .125 Wall
Element Length / Dia..................51 Ft
Turning Radius:..........................29 Ft
Stacking Distance....................... Call
Mast Size....................................2” to 3 ” Nom.
Wind area / Survival...................9.5 Sq. Ft. / 100 MPH
Weight / Ship Wt.........................99 Lbs. / 125 Lbs.
M2 Antenna Systems, Inc.
Model No: 40M3L
FEATURES:
The 40M3L is a linear loaded 40 meter Yagi designed with 20 years of experience and listening to
customer’s needs. The result is a powerful package of clean mechanical design, quality materials, and
outstanding performance that will deliver years of enjoyment on the 40 meter band.
Mechanically the elements are mounted between 1/2” thick, machined aluminum clamp plates! The
Driven element is split and insulated with a 1-1/4 inch solid fiberglass rod and fed with a weather sealed 1:1
balun. All elements use linear loading of 3/16" 6061-T6 aluminum rod to reduce overall length, wind load, and
turning radius. The linear loaded sections anchor 10" above the element to reduce inductive cancellation
(requiring LESS loading), reduce mechanical stress, and minimize element droop (in the air the antenna is
easily mistaken for a 15 or 20 meter Yagi!). Compare performance, construction and durability.... This is not
just another 40 meter Yagi!!
SPECIFICATIONS:
*Subtract 2.14 from dBi for dBd
M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722
Tel: [phone] Fax: [phone] Web: www.m2inc.com
©2011 M2 Antenna Systems Incoporated

BEFORE YOU BEGIN: Look over the DIMENSION SHEET, HARDWARE AND ELEMENT ASSEMBLY
DRAWINGS to get familiar with the various parts of the antenna. Tools handy for assembly process:
screwdriver, 11/32, 7/16, 1/2, 9/16 and 5/8” nut drivers, end wrenches and/or sockets, diagonal cutters,
and measuring tape. Small containers of zinc paste (Penetrox, Noalox, or equiv.) has been
provided to enhance and maintain the quality of all electrical junctions on this antenna. Apply a
thin coat wherever two pieces of aluminum come in contact or any other electrical connections
are made.
1. ELEMENT CLAMP BLOCK ASSEMBLY.
SEE “ELEMENT HARDWARE” drawing to aid in the assembly of this step. Start by assembling pairs
of ELEMENT CLAMP PLATES, #6 together with 1/4-20 x 2-1/2" bolts in the four outer holes. NOTE
THAT ONE SET OF CLAMP PLATES WILL ALSO GET A 1” X 1” X 6” ANGLE BRACKET FOR
MOUNTING THE BALUN. Add the 1/4-20 locknuts finger tight.
A. DRIVEN ELEMENT
On one of the element clamp plates assembled in the previous step, slip in the 1-1/4 X 24" fiberglass
rod and rotate until the element mounting holes are vertical. Center the rod and tighten the
hardware EVENLY, so the plates are parallel and the same amount of threads are showing
through all the locknuts. Slide the POLYETHYLENE DISC INSULATORS onto both ends of the
fiberglass rods and push them up against the clamp plates. The disc insulators can sometimes be a
very tight fit on the rods. If you can’t get them to fit place them in hot water a few minutes.
B. REFLECTOR, DIRECTOR ELEMENT
Slide a 1-1/4” x 24” aluminum CENTER COUPLING ROD into a CLAMP PLATE ASSEMBLY. Center
the assembly and align the bolt holes to vertical. Tighten all four outer element clamp plate bolts
EVENLY. Make sure plates remain parallel, top to bottom.
2. VERTICAL SUPPORT POST INSTALLATION. Use the ELEMENT HARDWARE drawing.
The element clamps require a 3/4” square x .125” wall x 11” WELDED VERTICAL SUPPORT POST to
raise and support the linear loading lines. Orient the WELDED PLATE over the element clamp plates.
Insert two 1/4-20 x 3-1/4” bolts through the holes in the SUPPORT POST . Then mount the posts to
the middle two holes of each clamp plate and secure with 1/4-20 locknuts.
Prepare the 1/4-20 x 6” turnbuckles by removing the RIGHT HAND THREAD END OF EACH
TURNBUCKLE and thread on a 1/4-20 “JAM NUT” as shown on the drawings, Thread the 1/4-20 nut
all the way up at this time. The nuts will be used to “LOCK UP” the turnbuckles once all the
adjustments are done. Install a TURNBUCKLE in each hole of the welded TOP PLATE as shown in the
drawing. NOTE: The hook is inserted from UNDER the plate through the hole. Finally, install a CABLE
EYE OR THIMBLE in the EYE of each turnbuckle.
3. HALF ELEMENT ASSEMBLIES
There are 6 half element assemblies. One pair each for the Reflector, Rear Driven, Front Driven, and
Director Elements. See the ELEMENT ASSEMBLY drawing to aid in the assembly of each half
element. Also refer to the DIMENSION SHEET and ELEMENT HARDWARE DETAIL drawings. Only
the 1/2” element tip sections are different lengths. The correct hardware to join the various sizes are as
follows:
For 1-1/2" to 1-1/4" tubing use 8-32 x 1-3/4" screws.
For 1-1/4" to 1" tubing use 8-32 x 1-1/2" screws.
For 1" to 1“ and 1” to 3/4" tubing use 8-32 x 1-1/4" screws.
For 3/4" to 1/2" tips use 5/8” compression clamps.
40M3L ASSEMBLY MANUAL

Locknuts have been provided for all the element assembly screws. Tighten the nuts until the joint
doesn't move when wiggled or shook. The element butt section closest to the boom always has one
hole located at the butt for a 1/4-20 bolt.
A. See the INSERT figure at the right of the ELEMENT ASSEMBLY drawing. Prepare the LINEAR
LOADING ARMS (1” center hole) with one 8-32 x 1/4” Allen head SET SCREW. (5/64 Allen
wrench supplied), one 8-32 x 1-1/2” screw and locknut. Slide a LINEAR LOADING ARM on each
1" section and position it next to the end screw.
B. Now slide the I” tube sections over the 7/8 x 9” fiberglass rod insulators. Connect the two sections
with 8-32 x 1-1/4" screws and locknuts. Orient the arms as shown and tighten the 8-32 x 1-1/2 screws
and locknuts. Be sure the arms are up against the screws closest to the fiberglass rod. THIS IS
IMPORTANT SINCE THE ARMS ARE USED FOR DIMENSIONING THE LINEAR LOADING
SHORTING BAR POSITION LATER IN THE ASSEMBLY
C. Locate the black plastic, 1” x 6” linear loading stabilizer bars. Attach them to the short 3/8” x 1-1/4”
x 3” support arm with the 1 inch hole. Use 8-32 x 1” screws and locknuts. Slide these on the SHORT,
one inch element sections and position about 3” in from the butt. Now attach the 1-1/4” x 60” element
sections. Add the 8-32 x 1-1/2” screws and locknuts but do not tighten until the STABALIZER BAR
AND ARM ASSEMBLY ARE IN THE FINAL POSITION. Orient the black stabalizer bar insulators
perpendicular to the element coupling holes and the support arms. Secure with 8-32 x 1-1/2” screws
and locknuts. Repeat for the other element halves.
E. Insert the 3/4 x 48” sections into the swaged 1” sections and secure with 8-32 x 1-1/4 screws and
locknuts.
NOW IS THE TIME TO DETERMINE WHAT PART OF THE BAND YOU WANT TO USE MOST AND
EMPHASISE. THE 3 BAND SEGMENTS INSURE VSWR UNDER 2:1 AND OPTIMUM GAIN & F/B.
F. Following the DIMENSION SHEET, add the 1/2” tip sections in pairs, noting that each element has
different tip lengths. Secure with 5/8” compression clamps.
G. As the outer element sections are being assembled, label each assembly as “REFLECTOR”,
DIRECTOR or “DRIVEN”, ” (according to the 1/2” tips) to avoid mix ups.
4. REFLECTOR AND DIRECTOR ASSEMBLY
See ELEMENT HARDWARE drawing.
Slide a 1-3/8” x 23-13/16" sleeve onto the 1-1/4” CENTER COUPLING ROD on the ELEMENT
CLAMP ASSEMBLY, and align the 1/4” holes. Temporarily pin the sleeve as necessary. Carefully slide
a 1-1/2” x 60” element section onto this assembly and align all holes. Insert a 1/4-20 x 2“ bolt and
tighten securely with 1/4-20 locknut. Repeat for the other element half. Now add the reflector element
outer half element assembly completed in the previous step to the 1-1/2" sections using 8-32 x 1-3/4"
screws and locknuts. Repeat for the other element halves.
5. DRIVEN ELEMENT ASSEMBLY
See ELEMENT HARDWARE drawing.
Slide a 1-3/8” x 23-13/16" sleeve onto each end of the two 1-1/4” fiberglass rods of the remaining
element clamp assemblies and align the 1/4” holes. Temporarily pin the sleeve as necessary.
Carefully slide the 1-1/2” x 60” element butt onto the element mounting plate assemblies and align all
holes. Locate 3/8” clamp blocks. Apply a little zinc paste to each of the channels. Loosely assemble
the blocks together, channel to channel. Install a 1/4-20 x 2-1/2” bolt up through the 1-1/2” element
butt and drop the blocks over the stud. Add a locknut but do not tighten the hardware at this time.
40M3L ASSEMBLY MANUAL

6. Now add the driven element outer half element assembly completed in previous steps to the 1-1/2"
sections using 8-32 x 1-3/4" screws and locknuts. Repeat for the other element half.
7. LINEAR LOADING ROD INSTALLATION (FOR BOTH ELEMENT HALVES)
Place each element assembly on a level surface with the support post up. FROM THE ELEMENT
BUTT SIDE, feed a 3/16” diameter LINEAR LOADING ROD through the flat support insulator.
Then insert the rod into the LL ARM. The rod should protrude just 1/2” through each arm. Tighten the
8-32 x 1/4" set screw and repeat for the other rod. Install a SHAFT RETAINERs, on these rod tips and
snug up against the LL arms. Repeat for the other element half. Repeat this step for each element.
NOTE: to start the RETAINER, hold the 3/8 x 3" PUSH TUBE in your hand with one end between your
thumb and forefinger. Now center the retainer on this end, “dish” into tube, and hold in place with the
same thumb and forefinger. Grasp the linear loading rod near the end with your other hand and firmly
push the retainer onto the rod.
8. SHORTING BAR PREPARATION
Locate the 16 shorting bar halves. Assemble the shorting bars with 8-32 x 1” screws and locknuts.
Finger tighten the locknuts for now. Next, begin to assemble the phyllistrand tension lines as shown
on the ELEMENT HARDWARE drawing. On each shorting bar, insert one end of each length of
PHILLISTRAN HPTG-1200 CORD into the CENTER hole of the shorting bar. Loop the cord AROUND
THE STRAIN RELIEF back through the other hole and allow about 2” to pertrude. Place a cable clip
here as a “backup” to the final clamping action of the shorting bar halves. Don’t tighten the hardware at
this time.
(OPTIONAL)> On each phyllistrand tension line insert two more 1/8” cable clips and allow them to
slide all the way to the shorting bar for now.
9. SHORTING BAR INSTALLATION
Next, feed each shorting bar onto the pair of linear rod ends and position about them at the
measurement as shown on the DIMENSION SHEET. NOTE the dimension is measured from the
OUTSIDE edge of the LL arm to the OUTSIDE edge of the shorting bar. (USING A BLACK
PERMANENT MARKING PEN OR EQUIVALENT, MARK THE SPOT ON THE ROD WHERE THE
SHORTING BAR SHOULD BE) Be sure the linear loading lines are centered about the main element.
Once the shorting bars have been correctly set, align, and tighten all of the 8-32 hardware. Cut off the
excess material (if any) so that about 1” of rod extends beyond the shorting bar. Start a SHAFT
RETAINER onto each rod end (just to backup the clamping function). Push the retainers up against
the shorting bar. Repeat for all of the other element halves.
10. SUSPENSION OF PHYLLISTRAN TENSION LINES
At this point you might want to perform the remaining steps on a flat surface. Support the ends of each
element tip up so that it is at the same height as the center section. Next insert the phyllistrand
tension lines through their respective turnbuckles, around each thimble or cable eye, and then finally
back through the two cable clips. See the ELEMENT HARDWARE drawing for an illustration. Now
pull on the free end of the phyllistrand until the entire element appears to be level. (IT MAY BE
HELPFUL TO RAISE THE OUTER END OF THE ELEMENT HALF WITH A 4” BLOCK OF WOOD OR
BRICK. At this point, secure the tension line by tightening the two 1/8” cable clips. Repeat this
procedure for all the other element halves. The final tensioning of the linear loading rods is done with
the TURNBUCKLES. This can be performed after the elements have been secured to the boom.
11. BOOM ASSEMBLY
Use the BOOM HARDWARE drawing as a guide to assemble the boom. At this point it will be helpful
to perform the remaining assembly steps with the antenna elevated off the ground (about 3 feet). This
can be accomplished by using sawhorses or something similar. Wipe off the swaged ends of each
boom section and apply a small amount of Penetrox. Insert the swaged end of the boom sections into
the straight piece. Align all of the holes, install the 1/4-20 x 3-1/2" bolts and locknuts, and tighten.
Install the 5/16 x 5” eyebolts near each end of the boom.
40M3L ASSEMBLY MANUAL

A. Install the 5/16” EYEBOLTS to the outer ends of the boom, securing with stainless 5/16” nuts and
lock washers. Align the eyes parallel with the boom and tighten.
12. For ease of element installation, support the boom about 2-3 feet above ground. Loosely attach
the BOTTOM CRADLES to the bottoms of the clamp plates using the 1/4-20 x 2-3/4" bolts. (BE SURE
TO USE ZINC PASTE ON THESE THREADS). Slide the REFLECTOR clamp plate onto the boom
end. Level the reflector element and tighten all four bolts EVENLY and firmly. Repeat for the DRIVEN
ELEMENT on the other end of the boom. ADJUST EITHER ELEMENT TO THE PROPER SPACING
BETWEEN ELEMENTS. Make sure the saddles are straight and level. A cocked clamp will loosen
quickly in the first wind. Align the elements and tighten the hardware
13. Now take a step back for a moment to observe any misalignment (if any) and the “droop” in each
element. Simply look down either the front or back of the boom to do this. If you have not already
done so, adjust each turnbuckle until each element droops 6 to 10 inches at the tip. NOTE: The
elements are the most stable in wind with a small amount of tip droop. ADJUST FOR LEVEL INNER
SECTIONS AND THE CORRECT TIP DROOP WILL BE AUTOMATIC. After the adjustments have
been made, proceed with tightening the 1/4-20 JAMNUT on all the turnbuckles.
14. 1:1 HF BALUN INSTALLATION — SEE ASSEMBLY DRAWINGS AND DIMENSION SHEET
Mount the balun to the angle plate on the driven element using a 2-1/2” U-bolt and saddle. Be sure the
balun vent hole is down. Do not over tighten as balun damage may occur.
15. INSTALLING THE HAIRPIN (MATCHING ASSEMBLY)
A. Apply a little Penetrox to the balun terminal lugs. Remove the nuts holding the 3/8 clamp blocks
and place the balun lead lugs over the studs. Replace the nuts loosely. Apply a little Penetrox to
the shorter bent ends of the hairpin tubes. INSERT the tubes into the grooved channels of 3/8”
clamp block assemblies on Driven element. Push the tubes through until at least 1/4" extends
beyond clamp and then tighten the clamp bolt slightly to hold the tubes from slipping. Rotate the
tubes so the bends are level and the long sections are parallel to the boom.
B. Install the 1/4-20 x 1/4” set screws into the ends of the HAIRPIN SHORTING BAR. Insert a 1/4-20
x 2” bolt into the hole of the #52 stainless band clamp from the inside and add the 3/8” x 1”
aluminum spacer. Add the shorting bar and the lock nut loosely to hold the assembly together.
Open the clamp and set it over the boom about 60 inches from the driven element. Now slide the
assembly to the ends of the hairpin tubes and insert the end into the shorting bar. ( lubricant like
WD-40 or zinc paste will let the shorting bar slide easier on the tubes. Position the shorting bar 38
inches from the driven element. Align the assembly, and tighten the band clamp. Next tighten the
nut securing the shorting bar and finally tighten the set screws onto the tube. NOTE: IF YOU CAN
DO FINAL VSWR MEASURMENTS AND ADJUSTMENTS DURING THE FINAL INSTALLATION,
DO NOT TIGHTEN THE SET SCREWS YET. SEE THE NOTE AT THE BOTTOM OF THE
“DIMENSION SHEET”
C. Now return the to balun end of the hairpin assembly and final tighten the bolts holding the tube
ends and the balun leads.
16 Attach the BOOM TO MAST PLATE at the balance point, using the two large 3” U-bolts, 3/8-16
stainless lockwashers, and nuts. Align plate to vertical and tighten nuts.
17. OVERHEAD BOOM SUPPORT SYSTEM.
A. Attach one end of the 5/16" Dacron cord to the rear eyebolt using two turns around the eyebolt and
a series of three half hitches or equivalent knots. Finish with about 6 inches of cord after the knots.
Without cutting the cord, do the same at the front eyebolt. Pull on the knots HARD to SET them.
Seal ends with heat or flame to prevent fraying. Tape the excess 6 inches of cord back to main cord
tightly with black vinyl electricians tape.
40M3L ASSEMBLY MANUAL

B. TEMPORARILY insert a 2 inch U-bolt through the turnbuckle plate and add two nuts so about 1/2
inch of the threads stick out. Insert this assembly through the top set of 2” U-bolt holes in the boom to
mast plate from the boom side and add two more nuts. Open the two turnbuckles up so just athread
or two from each end shows inside the body of the turnbuckle. Hook the turnbuckles into the holes at
the edge of the turnbuckle plate. Equalize the Dacron cord over the plate and cut it. Take two wraps
of the cord through the eye of the rear turnbuckle, PULL the cord as tight as possible and make the
knots as before. Repeat for the front cord section and turnbuckle. Cut off any excess over one foot
long and again seal and tape back to the main cord.
C. Now DISASSEMBLE the U-bolt from the boom to mast plate. Before installation, if possible, install
a short temporary mast, attach turnbuckle, and let the overhead guy system support the boom
overnight. The Dacron cord DOES NOT STRETCH UNDER THIS LOAD but it's weave will take a SET
and the boom may droop just a bit. If your boom droops again following final adjustments, check your
knots. They may be may be slipping.
D. After final installation of the antenna, the turnbuckle plate, installed loosely with a 2” U-bolt, is raised
up the mast. When the boom is straight the U-bolt is tightened. This should place the turnbuckle plate
4 to 6 feet above the boom. Do the final boom straightening with the turnbuckles and safety wire to
preserve adjustments.
18. Check ALL hardware for tightness. Check ALL element sections, especially tip sections, for correct
placement. Make any final adjustments to linear loading tension.
19. Attach the feedline section to the balun. Route it towards the boom to mast plate. Secure at
regular intervals with tape or nylon ties.
20. When mounting this antenna on a tower or mast with other antennas there may be interaction. In
general VHF and/ or UHF antennas mounted for HORIZONTAL POLARITY should be AT LEAST 40
inches above or below the antenna. Use good quality 50 Ohm coaxial cable to feed the antenna and
be sure your tower and rotator system can handle the wind loading and vertical weight of this antenna.
THIS COMPLETES ANTENNA ASSEMBLY
M2ANTENNA SYSTEMS, INC.
4402 N. SELLAND AVE.
FRESNO, CA 93722
[phone] FAX [phone]
www.m2inc.com Email: [email protected]
40M3L ASSEMBLY MANUAL

3/16" x 111" ROD
3/16" x 114" ROD
1-1/4" X 60"
DRIVEN ELEMENT
3/16" x 111" ROD
3/16" x 114" ROD
1-1/4" X 60"
REFLECTOR ELEMENT
3/16" x 111" ROD
3/16" x 114" ROD
OUTSIDE EDGES
1-1/4" X 60"
DIRECTOR ELEMENT
YOUR FINAL MATCH IS A BALANCE BETWEEN THE 'S' HAIRPIN DIMENSION
AND THE TIP LENGTH OF THE DRIVEN ELEMENT. IF YOU ADJUST EITHER,
DO IT IN 1" INCREMENTS AND ONLY ADJUST ONE AT A TIME BEFORE YOU
CHECK THE RESULT. 30 FEET ABOVE GROUND IS THE MINIMUM REQUIRED
MEASURMENT HEIGHT.READING MAY CHANGE RAPIDLY AND RADICALLY
BELOW 30 FEET.
BAND SEG. UNDER 2:1 7.0-7.130 7.1-7.240 7.150-7.30
REFLECTOR 58.50" 50.50" 47.50"
DRIVEN 44.50" 37.50" 34.50"
DIRECTOR 39.50" 31.50" 28.50"
'S' (HAIRPIN SHORT) 36" 36" 36"
108.5 "
108.5 "
108.5 "
ON ALL EIGHT
HALF ELEMENT
SECTIONS
1" X 1" X 6"
BALUN MTG.
ANGLE BKT.
3" x .125" x 180", PLAIN
1-1/2" X 60" SOE
EYEBOLT
355.0"
1-1/2" X 60" SOE
163"
'S'
HAIRPIN TUBES
AND SHORTING BAR
ELEMENT SPACINGS
1.5"
3" x .125" x 180" SOE
1/4-20 x 3-1/2"
BOLT AND LOCKNUT
189"
BOOM TO MAST PLATE
NEAR BALANCE POINT
1-1/2" X 60" SOE
EYEBOLT
CENTER
TO
CENTER 0
5/8"
COMPRESSION
CLAMP
1/2" X CHART
EXPOSED
1/2" X CHART
EXPOSED
1" X 60"
1" X 24" 5/8"
COMPRESSION
CLAMP
3/4" X 48"
1" X 60"
1" X 24"
3/4" X 48"
1/2" X CHART
EXPOSED
5/8"
COMPRESSION
CLAMP
40M3LL
1/2" TIP DIMENSIONS
1" X 60"
1" X 24"
3/4" X 48"
40M3L DIMENSION SHEET

1/2 x 1 x 4" CRADLE (2)
1/4" TURNBUCKLE (2)
PARASITIC ELEMENT
HARDWARE
1-1/4" X 24"
ALUM. ROD
1-3/8 X 23-13/16" SLEEVE
1-1/2 X 60" SOE
3/16" LINEAR
LOADING ROD (2)
1/4-20 X 2-3/4"
BOLT (4)
8-32 x 1"
SCREW &
LOCKNUT (5)
CABLE EYE
WIRE NUTS (2)
(CABLE CLIPS)
BOLT AND LOCKNUT
1/4-20 X 2-1/2"
BOOM, 3"O.D.
X .125 WALL
ELEMENT CLAMP BLOCK
1/2" X 3" X 6" (SIZE #6)
1/4-20 X 3-1/4"
BOLT & LOCKNUT
.
3/4" X 3/4" X .125" WALL
VERTICAL SUPPORT
1/4-20 SS
JAM NUTS
POST
1/4-20 X 2"
BOLT & LOCKNUT
DRIVEN ELEMENT HARDWARE
8-32 X 1"
SCREW &
LOCKNUT
5 PER SIDE
1-1/4" X 24"
FIBERGLASS ROD
1-3/8 X 23-13/16"
SLEEVE
1-1/2 X 60" SOE
1/4-20 X 2-3/4" BOLT
& LOCKWASHER
STRAIN RELIEF
HPTG 1200
PLILLISTRAN
(1) CABLE EYE
(3) CABLE CLIPS
8-32 X 1"
SCREW &
LOCKNUT
5 PER SIDE
ELEMENT CLAMP BLOCK
1/2" X 3" X 6" (SIZE #6)
1/4-20 X 2-1/2"
BOLT AND LOCKNUT
1/4-20 X 3-1/4"
BOLT & LOCKNUT
1/2" X 1" X 4"
INSULATOR
POLY DISC
BOOM, 3"O.D.
X .125 WALL
CRADLE
1/4-20 X 2-1/2"
BOLT & LOCKNUT
SHORTING BAR PAIRS
1/4" TURNBUCKLE
AND JAM NUT
3/4" X 11" SQ. RISER
& WELDED TOP PLATE
3/16" LINEAR
LOADING ROD
3/8" CLAMP
BLOCK
40M3L ASSEMBLY DETAIL

KEEPERS, OR
SHAFT RETAINERS
1 ON EACH END
BOOM HARDWARE ARRANGEMENT
SHORTING BAR HALVES
(2) PER ELEMENT HALF
3" X .125 X 180" SOE
LINEAR LOADING SUPPORT POST
WITH WELDED TOP PLATE
5/16 X 5"
EYEBOLT (2)
1/4" CABLE EYE (4)
2 PLCS. PER ELEMENT
BOLTS & LOCKNUTS
1/4-20 X 3-1/4"
TOP VIEW - LINEAR LOADING/ELEMENT CLAMP HDWE
1-3/8" x 23-13/16"
3/16 X 95' &
3/16" X 20" RODS
BOLTS & LOCKNUTS
4 PLCS PER ELEMENT
1/4-20 X 2-1/2"
1-1/2"x 60"
1/8" CABLE CLIPS (6)
1/8" CABLE EYE (2)
1-1/4" x 60
1/4 X 3/4 X 1"
COUPLING
2 PER SIDE
ALUMINUM=DRIVEN EL.
FIBERGLASS=REF& DIR
1-1/4" x 24" ROD:
1:1 BALUN
8-32 X 1-3/4"
SCREW &
LOCKNUT
1/4-20 X 2" BOLT
AND LOCKNUT (8)
2-1/2" U-BOLT & SADDLE (1)
5/16-18" NUTS (2)
5/16 LOCKWASHERS (2)
BALUN MOUNTING
'L' PLATE, 6" (1)
ATTACH BALUN LEADS TO
3/8" CLAMP BLOCKS
HAIRPIN TUBE
3/8" ALUM. TUBE (2)
1:1 BALUN AREA TOP VIEW
HAIRPIN SHORTING BAR DETAIL
(END VIEW)
3/8" X 1" SPACER
1/4-20 X 2" BOLT
& LOCKNUT
BAND CLAMP #52
1/-20 X 1/4" SET SCREW
LINEAR LOADING HARDWARE DETAIL
3" X .125 X 180" PLAIN
5/16" DACRON CORD,
X 30 FEET. CUT AS RQD.
5/16" TURNBUCKLES (2)
8 X 8 X 1/4 BOOM TO MAST PLATE
USE 1/4-20 X 3-1/2"
BOLTS & LOCKNUTS
8-32 X 1" SCREWS &
LOCKNUTS (5)
40M3LASY
M. STAAL
5-3-00
REV 12/03/07
8-32 X 1-1/2"
SCREW AND LOCKNUT
8-32 X 1-1/4"
SCREW &
LOCKNUT
7/8"x 9" FIBRGLASS ROD
1 X 6"
BLACK ABS
STABILIZER BAR
(BUTT AGAINST
1-1/4" TUBE)
8-32 X 1/4"
SET SCREW
1"x 60"
LINEAR LOADING
ARM (2)3/16" SHAFT
RETAINERS
8-32 X 1/4"
SET SCREW
7/8" X 9"
FIBERGLASS
ROD
8-32 X 1"
SCREW AND LOCKNUT
3/4"x48"
SUPPORT ARM FOR
STABILIZER BAR
1/2 X CHART
5/8"
COMPRESSION
CLAMP
ELEMENT ASSEMBLY
1/4-20 PLAIN
SS JAM NUT
8-32 X 1-1/2"
SCREW &
LOCKNUT
1"x24"
1/4-20 X 2-3/4"
BOLTS
8-32 X 1-1/4"
SCREW &
LOCKNUT
40M3L ASSEMBLY DETAIL

GENERIC COMPRESSION CLAMP DETAIL
NOTE:
Generic layout to show
how compression clamps work.
Your antenna may have one or the other
or may even have both compression
clamp sizes.

UNBAGED ITEMS
DESCRIPTION............................................................................................QTY
Assembly manual........................................................................................1
Insulator, 1-1/4” x 24" fiberglass rod...........................................................1
Coupling, center 1-1/4” x 24” alum. Rod.....................................................2
Boom to mast plate, 1/4” x 8” x 8" alum......................................................1
Balun, 1:1, 3-30 MHz SO-239 conn..........................................................1
Tension Line, Phyllistrand 1200 HTPG, 36”................................................6
Vertical support post, 3/4 sq x 11”, welded.................................................3
Zinc Paste ( Penetrox, Noalox or equivalent) container ............................1
Dacron cord, 5/16” x 30 feet........................................................................1
ALUMINUM TUBING
DESCRIPTION............................................................................................QTY
Boom section, 3” x .125” x 180" SOE (Drilled both ends)...........................1
Boom section, 3” x .125” x 180" STR..........................................................1
Sleeve, 1-3/8” x .058” x 23-13/16" .............................................................6
Element butt section, 1-1/2” x .058” x 60" SOE .........................................6
Element section, 1-1/4” x .058” x 60” SOE ...............................................6
Element section, 1.0” x .058” x 60” SOE.....................................................6
Element section, 1.0” x .058” x 24” SOE.....................................................6
Element section, 3/4” x .049” x 48" SOE.....................................................6
Element tip section, 1/2” x .049” x 61.50” ...................................................2
Element tip section, 1/2” x .049” x 47.50” ...................................................2
Element tip section, 1/2” x .049” x 42.50” ...................................................2
Hair pin tube, 3/8 x 55”................................................................................2
ALUMINUM ROD
DESCRIPTION............................................................................................QTY
Linear loading rod 3/16” x 114" alum. ........................................................6
Linear loading rod, 3/16 x 111" alum. .......................................................6
BAG #1
Linear loading arm, 3/8” x 1-1/4 ” x 3-3/4”, alum. 1” hole............................12
BAG #2
Insulator, stabilizer bar, 1/4” x 1” x 6” ABS. ................................................6
Support arm, for stabilizer bar 3/8” x 1-1/4” x 2-7/8”, alum. 1” hole............6
BAG #3
Disc insulator, 3/8” x 2" polyethylene, 1-1/4" hole......................................2
Clamp Block, hairpin, 1/4” x 1-1/4” x 1”” alum., 3/8” groove.......................4
Balun mounting angle bracket, 1” x 1” x 6” alum. .......................................1
Band clamp, #52 with hole..........................................................................1
Turnbuckle plate 3/16 x 2 x 5” , alum. ........................................................1
Turnbuckle, 1/4-20 x 6”, hook and eye .......................................................6
Turnbuckle, 5/16” hook and eye..................................................................2
Eyebolt, 5/16” x 5” #10843.........................................................................2
Cable eye, 1/4”............................................................................................4
Nylon ties, 12” .............................................................................................5
Spacer, 3/8 x 1” ( used in hairpin assembly)...............................................1
40M3L PARTS & HARDWARE

BAG #4
Shorting bar, 1/4” x 3/4” x 6".......................................................................12
Strain Relief, 1/2 x 1/2 blk delrin.................................................................6
Shorting bar, hairpin, 1/2 x 1/2 x 5” ...........................................................1
BAG #5
Saddle Clamp, 1/2” x 1.0” x 4" alum...........................................................6
Element Clamp plate, 1/2” x 3” x 6", 5/8” radius, alum #6..........................6
BAG #6
Fiberglass rod, 7/8” x 9” with 4 holes..........................................................6
BAG #7
U-bolt, 3" .....................................................................................................2
U-bolt, 2-1/2"...............................................................................................1
U-bolt, 2", HEAVY DUTY............................................................................4
U-bolt, 2” standard ......................................................................................1
BAG #8
Nut, 3/8-16 stainless ...................................................................................14
Lock washer, 3/8" split ring stainless..........................................................14
Nut, 5/16-18, stainless................................................................................6
Lock washer, 5/16" split ring, stainless.......................................................4
Bolt, 1/4-20 x 3-1/2" stainless .....................................................................2
Bolt, 1/4-20 x 3-1/4 stainless.......................................................................6
Bolt, 1/4-20 x 2-3/4" stainless .....................................................................12
Bolt, 1/4-20 x 2-1/2" stainless .....................................................................14
Bolt, 1/4-20 x 2.0" stainless.........................................................................5
Set screws, 1/4-20 x 1/4”,ss........................................................................2
Nut, 1/4-20”, stainless.................................................................................6
Nut, 1/4-20 locking, stainless......................................................................27
Allen wrench, 1/8” .......................................................................................1
BAG #9
5/8” Compression clamp.............................................................................6
Screw, 8-32 x 1-3/4” panhead, stainless ....................................................12
Screw, 8-32 x 1-1/2" panhead, stainless ....................................................30
Screw, 8-32 x 1-1/4" panhead, stainless ....................................................36
Screw, 8-32 x 1.0" panhead, stainless........................................................42
Screw, 8-32 x 1/2" panhead, stainless........................................................6
Set screw, 8-32 x 1/4” stainless .................................................................24
Nut, 8-32, stainless .....................................................................................6
Nut, 8-32 locking, stainless.........................................................................120
Shaft retainer, 3/16” stainless.....................................................................24
Push tube 3/8” x 3" alum.............................................................................1
Allen wrench 5/64” ......................................................................................2
Cable Clips, 1/8”..........................................................................................18
Small Cable Eyes, 1/8” ...............................................................................6
Carefully designed and manufactured in the USA by:
M2ANTENNA SYSTEMS, INC.
4402 N. SELLAND AVE.
FRESNO, CA 93722
[phone] FAX [phone]
www.m2inc.com Email: [email protected]
40M3L PARTS & HARDWARE