M2 Antenna Systems 6.9-4CDD-125 Bedienungsanleitung

M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722

Tel: (559) 432-8873 Fax: (559) 432-3059 Web: www.m2inc.com

9/28/20

REV 1

M2 Antenna Systems, Inc.

Model No: 6.9-4CDD-125

SPECIFICATIONS:

*Subtract 2.14 from dBi for dBd / FS = Free Space

Model .........................................6.9-4CDD-125

Frequency Range.......................6.8 –6.980 MHz cont.

Typical gain ................................12.3 @ 100’ dBi typical

Front to back ratio ......................21 dB typical

Beamwidth ...............................75°

Feed type / Balun .......................SO-239,1:4 Balun

Feed Impedance. .......................200 Ohms

VSWR.........................................1.2:1 typical, 2.0:1 max

Connector ...................................SO-239, Other avl.

Power Handling ..........................3 Kw, Higher avl.

Boom Length / Dia......................42’ / 3” X .125

Maximum Element Length..........49’

Turning Radius: ..........................34’

Mast Size....................................2” or 3” Nom.

Wind area / Survival ...................13.0 Sq. Ft. / 100 MPH

Weight / Ship Wt.........................450 Lbs. / 500 Lbs.

FEATURES:

Recently, M2 engineers developed a new way to make coils using CNC tooling. The result is a precision inductor

increasing Q and lowering loss to new levels. A coil loaded Yagi design was computer optimized, and not one single

change was required on the finished Yagi. This design gets the bandwidth and maintains performance across the band

like no other Yagi. Gain, Front to Back and VSWR are maintained nearly flat across the 6.8 to 6.980 MHz band section.

Mechanically it is easy to assemble. Only the tips of each element are different as all the coils are the same for each

element. The coils themselves float in air minimizing dielectric loss. They are fully covered with a polyethylene cover. This

antenna has been designed to meet your needs and give you years of reliability.

6.9-4CDD-125 ANTENNA OVERVIEW

BEFORE YOU BEGIN: Look over all the DRAWINGS to get familiar with the various parts and assem-

blies in the system. Tools handy for assembly process: screwdriver, 11/32”, 7/16”, 1/2”, 9/16” and 5/8”

spin-tites, end wrenches and/or sockets, and a measuring tape.

Note:

All installations are unique in some way, which means it's OK to preassemble certain hardware, or

rearrange the assembly process to meet specific site requirements. A quick review of the assembly

drawings should help firm up the appropriate strategy. Please remember to double-check all hard-

ware for tightness BEFORE it becomes inaccessible.

One container of zinc paste (Penetrox, Noalox, or equiv.) has been provided to enhance and

maintain the quality of all mechanical and electrical junctions on this system. Apply a thin coat

wherever two pieces of aluminum come in contact or any other electrical connections are made.

It is also useful on screws and bolt threads as an ANTI SEIZE compound.

REFLECTOR

REAR DRIVEN

ELEMENT

FRONT DRIVEN

ELEMENT

DIRECTOR

6.9 COIL OVERVIEW

COIL

(M2ACA1550)

COIL SUPPORT

(M2ACA1554)

COIL INSULATOR

(M2AFG0050)

COIL POST

(M2ACA1575)

(QTY 2)

COIL END CAP

(M2ACA1576)

(QTY 2)

NOTE: COVER REMOVED FOR ILLUSTRATION PURPOSES.

BOOM ELEMENT TIP

6.9 COIL ASSEMBLY

INSTRUCTIONS

STEP 1:

The coil comes wound tight with 16 total turns from the factory. The excess

material will be trimmed off after the coil is in its final position. Using a permanent

marker, draw a straight line from one end of the coil to the other. This will help later

to determine if your coil has grown in diameter during assembly. After final position-

ing of the coil no more 3/4 of an inch of line tilt is allowed. A larger coil will cause the

inductance to change which can cause your antenna to be off frequency.

STEP 2:

The COIL is wound tight at the factory to prevent damage during shipping. Use the

COIL SPREADING TOOL provided, and carefully insert it into the first turn of the

COIL. Now gently push or roll the tool through all 16 turns of the COIL. Now the

COIL is nearly in its final shape and is ready to be threaded onto the COIL SUP-

PORT. Note the reference line drawn earlier, it will have a slight tilt after spreading.

STEP 3:

On one end, use pliers to gently straighten the last 1/2” of the COIL and file

off any burrs.

STEP 4:

Begin threading the COIL onto one end of the COIL SUPPORT. BE CAREFUL to not deform the COIL during this

process. The COIL should thread smoothly. Continue until about 5-1/2 turns are past the COIL SUPPORT or close to the

center. Exact centering is not important. Again, note your reference line.

NOTE: PENETROX PASTE FOR LUBRICATING SCREW THREADS AND TUBING JOINTS HAS BEEN SUPPLIED. USE A VERY SMALL AMOUNT ON

EACH SCREW THREAD AND UNDER THE COIL POSTS DURING THE NEXT OPERATION.

STEP 5:

Insert the COIL INSULATOR (M2AFG0050) into your COIL SUPPORT (M2ACA1554). Rotate the COIL and the

COIL SUPPORT so the leading end of the COIL goes over and just past the inner hole in the COIL INSULATOR. Now slide

on one COIL POST on to one end of the COIL so it is right over the first hole. Next, carefully slide on the ELEMENT SEC-

TION #6 (M2AEP40MC-6) and align it so both holes in the tube match the two holes in the COIL INSULATOR.

STEP 6:

Insert hardware through the ELEMENT SECTION #6 and the COIL INSULATOR and begin threading it into the

COIL POST. Tighten hardware. Thread the SET SCREW into the top of the COIL POST and with about 1/2” of wire protrud-

ing past the COIL POST, tighten the SET SCREW gently. Use supplied ALLEN WRENCH to tighten the SET SCREW.

STEP 7:

The second COIL POST is mounted on the OPPOSITE SIDE of the COIL INSULATOR so 15 1/2 turns of the COIL

are used. The extra 1/2 turn COIL should pass over the COIL INSULATOR hole. Slide on the second COIL POST and align

1/2” TO 3/4”

TILT

6.9 COIL ASSEMBLY

INSTRUCTIONS

it over the hole. Slide on ELEMENT SECTION #4

(M2AEP40MC-4) and fasten the COIL POST to the tubing

assembling using the supplied hardware. Use you refer-

ence line and adjust the coil so the line has no more tilt

than 3/4”

STEP 8:

Insert the SET SCREW into the COIL POST and

tighten gently. Adjust the COIL and COIL SUPPORT loca-

tion for equally spaced turns. The distance between each

turn should be the same as the COIL wire diameter. Once

the COIL is straight and aligned, tighten the final SET

SCREW securely.

STEP 9:

Slide COIL COVER and COIL END CAPS onto

COIL ASSEMBLY. Secure COIL END CAPS into position

by securing hardware through TUBE ASSEMBLIES on

both ends of the COIL ASSEMBLY. Slide ELEMENT

OVERHEAD SUPPORT onto ELEMENT SECTION until it

reaches the head of the screw holding on the COIL COV-

ER. Clamp ELEMENT OVERHEAD SUPPORT in place with screw and locknut.

STEP 10:

Assemble all the remaining COIL ASSEMBLIES by repeating steps 1-9. Set COIL ASSEMBLIES aside for future use.

COIL (15.5 TURNS)

(M2ACA1550)

COIL INSULATOR

(M2AFG0050)

COIL SUPPORT

(M2ACA1554)

ELEMENT SEC-

TION #4

ELEMENT SECTION #6

(M2AEP40MC-6))

COIL POST

(M2ACA1551)

SCREW, 8-32 X 1-1/4”

SET SCREW, 1/4-20 X 1/4”

STEP 11:

At this point it will be helpful to perform the remaining assembly steps with the BOOM ASSEMBLY

elevated off the ground (about 3 feet). This can be accomplished by using sawhorses or something similar.

Wipe off the ends of each BOOM SECTION and apply a small amount of PENTROX. Refer to the drawing be-

low and assemble BOOM SECTIONS as shown. Insert hardware and tighten.

STEP 12:

Add the guy clamps to boom sections 1 # 3, see dimension sheet for location.

6.9-4CDD-125 BOOM ASSEMBLY

INSTRUCTIONS

3” SCHED 40 PIPE X 20’

BOOM SECTION #2

(QTY 1)

GUY CLAMP

(2) BOLT, 3/8-24 X 1.5 SS

(2) LOCK WASHER SS

3.0 X .125 X 145”

BOOM SECTION #1 & 2

(QTY 1)

(2) BOLT, 3/8-16 X 4.0 SS

(2) 3/8-16 NUTS SS

(2) LOCK WASHER SS

THE BOOM SECTIONS ARE LINE

DRILLED AT THE FACTORY. EACH END

WILL HAVE MARKINGS AT THE JOINTS

INDICATING ORIENTATION.

STEP 13:

Assemble the ELEMENT MOUNT

assemblies for the reflector and front director

element. Refer to the assembly drawing to aid in

assembly. Be sure to center the ELEMENT

CENTER SPLICE and the holes are in the

vertical position.

STEP 14:

Assemble the DRIVEN ELEMENT

MOUNT assembly for the DRIVEN ELEMENTS.

Refer to the assembly drawing to aid in assembly.

Be sure to center the INSULATOR and that the

holes are in the vertical position. The DISC

INSULATORS are a press fit. Heating them with

a heat gun or hot water will help in assembly.

6.9-4CDD-125 ELEMENT MOUNT ASSEMBLY

INSTRUCTIONS

BOLT, 1/4-20 X 2-3/4”

LOCKNUT, 1/4-20

(QTY 4)

ELEMENT MOUNTING

PLATE

(M2AEC0040)

(QTY 2)

ELEMENT CENTER SPLICE

(M2ASR0050)

ELEMENT MOUNT ASSEMBLY

REFECTOR OR DIRECTOR

BOLT, 1/4-20 X 2-1/2”

LOCKNUT, 1/4-20

(QTY 4)

CRADLE 3”

(M2AMC0136)

(QTY 2)

VERTICAL RISER

ASSEMBLY

(M2AVR0010)

BOLT, 1/4-20 X 3-1/2”

AND LOCKNUT

(QTY 2)

CRADLE 3-1/2”

(M2AMC0175)

(QTY 2)

ELEMENT MOUNTING

PLATE

(M2AEC0059)

(QTY 2)

BOLT, 1/4-20 X 2-1/2”

LOCKNUT, 1/4-20

(QTY 4)

INSULATOR

(M2AFG0034)

VERTICAL RISER

ASSEMBLY

(M2AVR0010)

BALUN BRACKET

(M2APT0016)

DISC INSULATOR

(M2ADI0020)

(QTY 2)

ELEMENT MOUNT ASSEMBLY

DRIVEN ELEMENT

BOLT, 1/4-20 X 3-1/2”

LOCKNUT, 1/4-20

(QTY 4)

BOLT, 1/4-20 X 3-1/2”

AND LOCKNUT

(QTY 2)

6.9-4CDD-125 ELEMENT ASSEMBLY DETAIL

2 (QTY) SCREW,

8-32 X 1-1/2”

& LOCK NUT

1 1/4 X .058 X 85.5”

1 3/8 X .058 X 56”

1 1/2 X .058 X 60”

1 3/8 X .058 X 53”

1 1/2 X .058 X 60”

1 5/8 X .058 X 56” 1 1/4 X .058 X 60”

1 1/4 X .058 X 24”

1 1/8 X .058 X 24”

1 X .058 X 24”

1 1/8 X .058 X 24”

1 X .058 X 26”

1 X .058 X 27”

3/4 X .049 X 27”

2 (QTY) SCREW,

8-32 X 1-1/4”

& LOCK NUT

IN SOME CASES THE COILS MAY BE PRE ASSEMBLED. IF YOUR COILS ARE PRE-

ASSEMBLED, SKIP THE COIL ASSEMBLY STEPS.

3 (QTY) SCREW

8-32 X 2”

& LOCK NUT

2 (QTY) SCREW,

8-32 X 1-3/4”

& LOCK NUT

NOTE: For the final assembly on all the elements, it is best to perform the next steps on the ground or long flat surface.

This will aid during final adjustment of the ELEMENT OVER HEAD SUPPORT. The ELEMENT HALVES are symmetrical

on both sides EXCEPT FOR THE ELEMENT TIP.

STEP 15:

Use the ELEMENT ASSEMBLY DETAIL to assemble each element half. Add the element halves to the to the pre-

assembled element mount assemblies.

STEP 16:

To adjust the ELEMENT TIP, a COMPRESSION CLAMP is supplied for use during tune up. First thread on the

hex nut to capture the screw in the CLAMP. Then slide the COMPRESSION CLAMP so that the screw is lined up with the

hole in ELEMENT SECTION #5. Use the DIMENSION SHEET and set the proper exposed length of the 1/2” ELEMENT

TIP for the appropriate element, then mark the element assembly to avoid confusion later. See GENERIC COMPRES-

SION CLAMP DETAIL page for more detail.

STEP 17:

Tensioning the element overhead guys: Start at the VERTICAL RISER and bend the thimbles open and insert

them into the holes on the top plate of the VERTICAL RISER, then bend them back to there original shape. Cut the HPTG-

1200 in half and Loop the Philystran cord thru the thimble, add qty (2) 1/8 wire clip and leave 3” of excess Philyistran past

the wire clip and tighten, finalize by taping the short tail of Philystran cord down to the main portion of Philystran. Thread

the opposite end of the cord through the ELEMENT OVERHEAD SUPPORT (M2APL0211) (See the LOCK BLOCK DE-

TAIL page) and tension the rope so the element is in a level or neutral position. It is always best to have the element in a

level or neutral position or with a slight sag downward. Over tensioning can lead to a upward bowed element causing in-

stability. This finalizes the element construction.

ELEMENT FINAL

ASSEMBLY INSTRUCTIONS

GROUND OR FLAT SURFACE

ADD THE

APPROPRIATE

ELEMENT TIP

SEE DIMENSION

SHEET

(1) 3/16 THIMBLE

(2) 1/8 WIRE CLIPS

6.9-4CDD-125 ASSEMBLY DETAIL

BOLT, 1/4-20 X 3-1/2”

LOCKNUT, 1/4-20

(QTY 2)

BOLT, 1/4-20 X 3-12”

AND LOCKNUT

(QTY 2)

CRADLE 3.5”

(M2AMC0175)

(QTY 2)

BOLT, 1/4-20 X 2”

LOCKNUT, 1/4-20

(QTY 4)

PHASE LINE CLAMP

BLOCK

(M2APL0035)

(QTY )

USE 3/16 THIMBLE

& 1/8 WIRE CLIPS

VERTICAL RISER

ASSEMBLY

(M2AVR0010)

ELEMENT MOUNTING PLATE

(M2AEC0059)

(QTY 2)

ELEMENT ASSEMBLY

FRONT DRIVEN ELEMENT

VERTICAL RISER

ASSEMBLY

(M2AVR0010)

BOLT, 1/4-20 X 2-1/2”

LOCKNUT, 1/4-20

(QTY 4)

ELEMENT MOUNTING PLATE

(M2AEC0040)

(QTY 2)

BOLT, 1/4-20 X 2-3/4”

AND LOCKNUT

(QTY 2)

CRADLE 3.5”

(M2AMC0136)

(QTY 2)

BOLT, 1/4-20 X 2”

AND LOCKNUT

(QTY 2)

USE 3/16 THIMBLE

& 1/8 WIRE CLIPS

ELEMENT ASSEMBLY

REFLECTOR OR DIRECTOR

ELEMENT

BOLT, 1/4-20 X 3-1/2”

LOCKNUT, 1/4-20

(QTY 2)

BALUN CONNECTS

TO BOTH

PHASE LINE CLAMP

BLOCKS

ON THE FRONT

DRIVEN ELEMENT

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