Yagi 6M5X User manual

SPECIFICATIONS
Model .........................................6M5X
Frequency...................................50-50.5 + FM dims.
Gain............................................9.4 dBd
Front to back...............................21 dB typ.
Beamwidth ................................E=42o/ H=52o
VSWR.........................................1.1 @ 50.175 MHz
Power Handling ..........................1.5 kW
Match Type.................................'T' Match
Balun...........................................4:1 Coaxial
Turning radius.............................11 ft.
Recommended Stacking............15-21’.High 19-23’. Wide
Feed Impedance / Conn.............50 Ohms / “SO-239
Lightning Protection....................All Elements Grounded
Boom length / Dia.......................18’ / 1-1/2" Dia
Element Type .............................3/8" tube
Mast Size....................................1-1/2 to 2” nom.
Wind area / Survival ...................2.2 sq. ft. / 100 MPH
Weight / Ship wt..........................9 lbs. / 11lbs.
FEATURES
The 6M5X is the latest computer optimized version of our
popular 6M5. The 6M5X is two feet longer but front to back and
gain are noticeably improved. We just made a good thing better
maintaining low wind load and great performance for its size. It
will compliment the rest of your antenna system and not
overload your tower. Quick and easy to assemble, it is also
great for mountain topping, grid expeditions and DXpeditions.
The 6M5X features the same machined aluminum element
mounting blocks, and sealed “T” match block,that all M2‘s use.
The 6M5X is perfect for the Ham trying 6 meters for the first time
or the seasoned vet who may stack them for lower angle of radiation or even some EME use. A tuning chart is included
in the manual for the FM band. An upgrade kit is offered for older 6M5’s.
5-4-99
Rev
7-24-03

TOOLS REQUIRED: Screwdriver, 11/32 wrench, socket or nut driver, a 7/16" wrench and 1/2"
wrench and socket, tape measure.
1. Layout the boom sections as shown on Dimension Sheet and assemble using (6) 8-32 x 1-3/4"
screws, locknuts. Tighten the nuts securely.
2. Use the Dimension Sheet as reference for installing the ELEMENT HALVES on to the ELEMENT
MOUNTING BLOCKS. For each element insert a 1/4 x 10” Element Support Rod from the drilled end.
Secure the rod / element assemblies to the element mounting blocks with (10) 8-32 x 1" screws and
locknuts. Install screws from bottom of blocks.
3. Mount the longest element (REFLECTOR) to the hole at the rear end of the boom using a 8-32 x
2" screw and locknut. Tighten securely.
4. Mount the DRIVEN ELEMENT next, threading the 8-32 x 2” screw into the 'T' MATCH BLOCK held
to the underside of the boom. Orient the match block with the “N” feed connector pointed to the front.
Mount the remaining DIRECTOR ELEMENTS. Carefully note lengths on Dimension Sheet:.
5. Thread the gold SEAL NUTS all the way onto the two small connectors on the 'T' match block with
the black neoprene side out. Then connect the balun connectors and tighten them GENTLY with a
7/16" end wrench. Now run the seal nuts up against the face of the balun connectors and tighten
them about 1/2 turn with a 1/2" end wrench. Secure coiled balun to boom with two nylon ties. The
balun does not need to be coiled. It can be unrolled and fastened to the boom to the front or rear.
6. Install two 8-32 x 1/4” Set screws into each SHORTING BAR. Then slide a SHORTING BAR onto
each DRIVEN ELEMENT HALF and position per the DIMENSION SHEET. Align rods and element
halves parallel and tighten the set screws with the 5/64" Allen wrench provided.
7. Install the feedline or a short section long enough to reach the boom center and on down the mast
and on past the the top of the tower. If the short section is used then the main feedline can be
attached at the time of installation on the tower. Tightening the Male 'N' connector carefully, and route
the cable forward on the boom, securing it with the cable ties provided. Stop about 24" in front of the
first director.
8. Mount the BOOM TO MAST PLATE perpendicular to elements at or near the physical balance
point of the antenna. Secure with the 1-1/2" U-bolts, 5/16” stainless steel lockwashers and nuts. Do
not over-tighten as severe boom distortion and subsequent weakening can occur. 2” U-bolts are
supplied for attaching the plate to your mast.
9. When the antenna is installed in position on the mast, the main feedline can be connected and
sealed at that time. REMEMBER to support the feedline at the antenna boom and on the mast.
Leave an adequate feedline loop for rotation around the tower. When stacking this antenna with other
HF models, maintain a minimum 5’ of separation; more if practical. Mount horizontally polarized VHF
and UHF antennas at least 40” above or below this antenna to minimize interaction.
10. INSTALLATION AND STACKING INFORMATION
A. A mast or cross boom that supports the antenna in the element plane must be non
conductive (fiberglass, etc). The feed line must also always exit the antenna at 90 degrees or
perpendicular to the elements for at least 60 inches.
B. 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 and annoying intermittence.
C. If possible, test the antenna, connectors and feedline BEFORE installing to your mast or tower.
Set antenna on a tall ladder or temporary mast. Check for continuity and match across the
bandwidth. It should be similar to rated specifications.
D. 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 wavelength in order to
maintain equal phasing in the array. Improper phasing can severely deteriorate performance.
If you are unsure about stacking multiple antennas, please call M2and let us help you DO IT
RIGHT THIS COMPLETES THE ANTENNA ASSEMBLY.
Carefully manufactured by:
M2Antenna Systems Inc.
4402 N. Selland Ave.
Fresno, CA 93722
[phone] Fax: [phone] www.m2inc.com Email: [email protected]
TYPICAL HARDWARE ARRANGEMENT
ELEMENT MOUNTING BLOCK
8-32 X 2" SCREW
AND LOCKNUT
DRIVEN ELEMENT
SHORTING
BAR
1/2 WAVE LENGTH
RG6-U BALUN
1-1/2" BOOM
REFLECTOR
ELEMENT
8-32 X 1" SCREW
AND LOCKNUT
FEEDLINE
8-32 X 1/4" SETSCREW
"T" MATCH
BLOCK
NYLON TIE

BOTTOM VIEW
6M5X DIMENSIONS
114.0
8-32 x 1" HDWE
1/4-20 x 2" HDWE
MOUNT DRIVEN ELE.WITH
AN 8-32 X 2" SCREW
TO SCALE THE ANTENNA TO HIGHER FREQUENCIES US THE FOLLOWING:
50.2/52.0 (NEW FREQ) = .9653 (SCALING FACTOR)
THEN MULTIPLY EACH ELEMENT TUBE LENGTH X THE SCALE FACTOR:
58.812 X .9653 = 56.772 & ROUND TO NEAREST 1/16" OR 56.75"
TOP VIEW OF ANTENNA
1/4 x 10" ELEMENT
SUPPORT ROD INSIDE
3/8" ELEMENT
147.125
3/8" ELEMENT
215.0
50.2
1.2:1
50.0
171.0
50.650.4
TYPICAL VSWR CURVES ABOVE 10' IN HEIGHT.
ELEMENT
SPACING
1.5:1
2.0:1
69.25
24.875
0.0
COUPLE BOOM SECTIONS
WITH 8-32 X 1-3/4" SCREWS
AND LOCKNUTS
cw/ssb
57.0
SHORTING BARS
LOCKED WITH
8-32 X 1/4" SET
SCREWS
MOUNT BOOM TO
MAST PLATE AT 93"
or (BALANCE POINT)
DECIMAL TO
FRACTION
CONVERSION
.062 = 1/16
.125 = 1/8
.188 = 3/16
.250 = 1/4
.313 = 5/16
.375 = 3/8
.437 = 7/16
.500 = 1/2
.562 = 9/16
.625 = 5/8
.688 = 11/16
.750 = 3/4
.813 = 13/16
.875 = 7/8
.937 = 15/16
USE 8-32 X 2"
SCREW AND LOCKNUT
TO MOUNT BLOCKS
USE 8-32 X 1"
SCREW AND
LOCKNUTS
52.125"
6M5XDIMS
M. STAAL
6-10-99
REV 9-13-02
52.5"
ALL ELEMENTS 3/8" TUBE.
SECURE BALUN WITH
BLACK NYLON TIES.
8-32 x 1-3/4" SCREW
& LOCKNUT
7.50"
56.50"
53.75"
ELEMENT
TUBE LENGTH
58.812"

6M5X PARTS LIST 5-4-99
REV 9-13-02
DESCRIPTION QTY.
Boom Section #1 1-1/2 x .058 x 60" S.O.E. Alum.....................1
Boom Section #2 1-1/2 x .058 x 60" S.O.E. Alum.....................1
Boom Section #3 1-1/2 x .058 x 60" S.O.E. Alum.....................1
Boom Section #4 1-1/2 x .058 x 45" Alum.................................1
Element halves, 3/8” x see dims...............................................10
Element Support Rod, 1/4 x 10”................................................10
Driven `T' Match Assembly with SO-239 conn. (N optional)......1
Balun, 4:1, 1/2 wave, RG-6U ....................................................1
Boom Plate 4 x 6 x 3/16 Alum...................................................1
U-Bolt 2" ...................................................................................2
U-Bolt 1 1/2" .............................................................................2
Assembly Instructions...............................................................1
HARDWARE BAG
Shorting Bars 3/4 x 1/4 x 2-7/8" machined alum.......................2
Element Mounting Blocks 3/4 x 3/8 x 3" alum...........................5
Screw 8-32 X 2" panhead ss.....................................................5
Screw 8-32 x 1 3/4" panhead ss ...............................................6
Screw 8-32 x 1” panhead ss .....................................................10
Locknut 8-32 ss ........................................................................25
Nuts 5/16-18 ss.........................................................................8
Lockwashers 5/16 Split Ring.....................................................8
Cable Ties 8" Black...................................................................4
Screw Internal Hex Set 8-32 x 1/4 ss........................................4
Allen Wrench 5/64”...................................................................1
Nut Seals..................................................................................2
M2Antenna Systems Inc.
4402 N. Selland Ave.
Fresno, CA 93722
[phone] Fax: [phone]
www.m2inc.com Email: [email protected]