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SPECIFICATIONS:
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
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.
M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722
M2 Antenna Systems, Inc.
Model No: 6.9-4CDD-125
*Subtract 2.14 from dBi for dBd / FS = Free Space
Tel: (559) 432-8873 Fax: (559) 432-3059 Web: www.m2inc.com
©2018 M2 Antenna Systems Incorporated
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.
9/28/20
REV 1
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Summary of Contents for M2 Antenna Systems 6.9-4CDD-125
- Page 1 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. M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722 Tel: (559) 432-8873 Fax: (559) 432-3059 Web: www.m2inc.com...
- Page 2 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.
- Page 3 6.9 COIL OVERVIEW BOOM ELEMENT TIP COIL COIL INSULATOR (M2ACA1550) (M2AFG0050) COIL POST COIL END CAP COIL SUPPORT (M2ACA1575) (M2ACA1576) (M2ACA1554) (QTY 2) (QTY 2) NOTE: COVER REMOVED FOR ILLUSTRATION PURPOSES.
- Page 4 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.
- Page 5 6.9 COIL ASSEMBLY INSTRUCTIONS it over the hole. Slide on ELEMENT SECTION #4 COIL POST ELEMENT SEC- (M2AEP40MC-4) and fasten the COIL POST to the tubing (M2ACA1551) TION #4 assembling using the supplied hardware. Use you refer- SCREW, 8-32 X 1-1/4” ence line and adjust the coil so the line has no more tilt SET SCREW, 1/4-20 X 1/4”...
- Page 6 6.9-4CDD-125 BOOM ASSEMBLY INSTRUCTIONS 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.
- Page 7 6.9-4CDD-125 ELEMENT MOUNT ASSEMBLY INSTRUCTIONS ELEMENT MOUNT ASSEMBLY REFECTOR OR DIRECTOR VERTICAL RISER ASSEMBLY STEP 13: (M2AVR0010) ELEMENT CENTER SPLICE Assemble the ELEMENT MOUNT (M2ASR0050) assemblies for the reflector and front director element. Refer to the assembly drawing to aid in BOLT, 1/4-20 X 3-1/2”...
- Page 8 6.9-4CDD-125 ELEMENT ASSEMBLY DETAIL 2 (QTY) SCREW, 8-32 X 1-3/4” & LOCK NUT 3 (QTY) SCREW 8-32 X 2” & LOCK NUT 1 1/4 X .058 X 85.5” 1 3/8 X .058 X 56” 1 3/8 X .058 X 53”...
- Page 9 ELEMENT FINAL ASSEMBLY INSTRUCTIONS (1) 3/16 THIMBLE (2) 1/8 WIRE CLIPS ADD THE APPROPRIATE ELEMENT TIP SEE DIMENSION SHEET GROUND OR FLAT SURFACE 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.
- Page 10 6.9-4CDD-125 ASSEMBLY DETAIL ELEMENT ASSEMBLY REFLECTOR OR DIRECTOR ELEMENT VERTICAL RISER USE 3/16 THIMBLE ASSEMBLY & 1/8 WIRE CLIPS (M2AVR0010) BOLT, 1/4-20 X 2-1/2” LOCKNUT, 1/4-20 (QTY 4) ELEMENT MOUNTING PLATE BOLT, 1/4-20 X 2” (M2AEC0040) AND LOCKNUT (QTY 2) (QTY 2) BOLT, 1/4-20 X 3-1/2”...
- Page 11 6.9-4CDD-125 PHASING LINE AND BALUN ASSEMBLY INSTRUCTIONS STEP 18: Refer to the dimension sheet for element placement. With the boom elevated on sawhorses or equivalent, using a long tape measure and a permanent marker lay the boom out by marking the centers of each element. Equalize the amount of extra boom at both ends on the antenna.
- Page 12 6.9-4CDD-125 ASSEMBLY INSTRUCTIONS STEP 24 Insert PHASING LINES into THE PHASE LINE CLAMP 4:1 BALUN LEADS BLOCK. Attach the balun leads to each side under the nuts that tight- ATTACH TO en the phase line clamps. EACH SIDE OF THE...
- Page 13 6.9-4CDD-125 DIMENSION SHEET REFLECTOR ELEMENT EXPOSED 1/2 TIP 57.00” 48.00” FROM CLAMP BOTH ENDS 176.00” REAR DRIVEN ELEMENT EXPOSED 1/2 TIP 54.50” THE NOTED EXPOSED DIMENSIONS ARE AN ATTACH PHASE APPROXIMATION. IF YOU WOULD LIKE TO SLIDE LINE STAND OFF...
- Page 14 GENERIC COMPRESSION CLAMP DETAIL...
- Page 15 LOCK BLOCK DETAIL LOCK BLOCK ROPE ROUTE DETAIL...
- Page 16 6.9-4CDD-125 PARTS & HARDWARE DESCRIPTION BOOM SECTION #1-3, 3.0” X .125” X 145”, (M2ABS6.94CDD125-1-3) ......... 2 BOOM SECTION #2, 3” SCHED 40 X 240” (M2ABS6.94CDD125-2) ..........1 ELEMENT SECTION #1: 1-5/8” X .058” X 56” (M2AEP7915KT9-1) ..........8 ELEMENT SECTION #1: 1-1/2” X .058” X 60”, SOE (M2AEP7915KT9-2) ........8 ELEMENT SECTION #1: 1-1/2”...
- Page 17 LOCKNUT, 8-32, SS .......................... 100 ALLEN HEAD WRENCH, 1/8” ......................1 NYLON TIE 12” ..........................10 40MCDD-42 DIMENSION SHEET M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722 Tel: (559) 432-8873 Fax: (559) 432-3059 Web: www.m2inc.com ©2020 M2 Antenna Systems Incorporated...
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