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SPECIFICATIONS:

Model ........................................ 20M6-125
Frequency Range ...................... 14.0– 14.350 MHz
*Gain, (FS) / Over gnd ............... 11.19dBi / 16.6dBi @70'
Front to back .............................. 25 dB Typical
Beamwidth ............................... E=46° / H=60°
Feed type ................................... Hair pin match
Feed Impedance........................ 50 Ohms Unbalanced
Maximum VSWR ....................... 1.2:1
Input Connector ......................... SO-239, Others avl.
FEATURES:
The 20M6-125 is a medium spaced, high performance, full band coverage 6 element Yagi, computer optimized to
squeeze the last drop of performance from this boom length. The design provides virtually flat gain, exceptional front to
back and excellent VSWR never exceeding 2:1 at the upper band edge. Larger, sleeved elements and boom provide the
125 MPH wind survival factor. Construction includes machined boom to element mounting plates and a rugged hairpin
match. This antenna will be in the air for many years, keeping you on the top of the pileup in spite of Mother Nature!
There is no finer, stronger antenna available today.
M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722
M2 Antenna Systems, Inc.
Model No: 20M6-125
*Subtract 2.14 from dBi for dBd / FS = Free Space
Tel: (559) 432-8873 Fax: (559) 432-3059 Web: www.m2inc.com
©2016 M2 Antenna Systems Incorporated
Power Handling ......................... 3 Kw, Higher avl.
Boom Length / Dia ..................... 59' / 3.0 x .125 Wall
Element Length / Dia. ................ 36.5' / 1 1/4" –1/2"
Turning Radius: ......................... 40'
Stacking Distance ...................... 65' -70'
Mast Size ................................... 2" to 3 " Nom.
Wind area / Survival .................. 16 Sq. Ft. / 125 MPH
Weight / Ship Wt. ....................... 240 Lbs. / 270 Lbs.
01/20/16
Rev.03

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Summary of Contents for M2 Antenna Systems 20M6-125

  • Page 1: Specifications

    *Subtract 2.14 from dBi for dBd / FS = Free Space FEATURES: The 20M6-125 is a medium spaced, high performance, full band coverage 6 element Yagi, computer optimized to squeeze the last drop of performance from this boom length. The design provides virtually flat gain, exceptional front to back and excellent VSWR never exceeding 2:1 at the upper band edge.
  • Page 2 20M6-125 DIMENSION SHEET NOTE: HAIRPIN HAS BEEN ROUTED TO THE REAR OF ANTENNA. (SEE HAIRPIN ADDENDUM FOR MORE INFORMATION).
  • Page 3 20M6-125 ASSEMBLY DETAILS...
  • Page 4 20M6-125 HAIRPIN ADDENDUM NOTE: HAIRPIN HAS BEEN ROUTED TO THE REAR OF ANTENNA TO AVOID INTERFEARENCE WITH OVERHEAD SUPPORT EYEBOLT...
  • Page 5 20M6-125 ASSEMBLY MANUAL NOTE: THE “DIMENSION SHEET” AND THE “HARDWARE ARRANGEMENT” DRAWINGS ARE QUITE COMPLETE WITH ASSEMBLY INFORMATION. EXPERIENCED BUILDERS MAY NOT REQUIRE THE WRITTEN INSTRUCTIONS. WHEN IN DOUBT, USE THE WRITTEN WORD. ANTI- SEIZE PASTE (PENETROX OR NOALOX) IS RECOMMENDED ON ALL HARDWARE THREADS AND ALUMINUM JOINTS.
  • Page 6 20M6-125 ASSEMBLY MANUAL 7. HAIRPIN MATCH ASSEMBLY: Refer to the HARDWARE ARRANGEMENT drawing. Insert a 1/4- 20 X 2-1/4” bolt from inside the band clamp and Install the band clamp loosely positioned about 30” inches in front of the driven element. Mount the BALUN using the 2-1/2” U-bolt and cradle but do not over tighten.
  • Page 7 WIRE ROPE ASSEMBLY DETAIL Wire rope assembly half is pre-assembled at factory as shown above. Complete the other end of the assembly using the supplied wire nuts, cable eye and turnbuckle as shown below. In some Note: Picture below is used only to show overhead support wire rope assembly detail.
  • Page 8 GENERIC COMPRESSION CLAMP DETAIL...
  • Page 9 20M6-125 PARTS & HARDWARE DESCRIPTION BOOM SECTIONS, 3" X .125 X 180” SOE ALUM. TUBE ....... 2 BOOM SECTIONS, 3" X .125 X 180” STRAIGHT ALUM. TUBE ....2 BOOM SPLICE ASSEMBLY, 2-1/2 X 120" W/SPLICE RINGS ....... 1 SIDE GUY TUBE, 1.5 X .058 X 60" ..............2 BOOM TO MAST PLATE, 3/8 X 12 X 12"...
  • Page 10 20M6-125 PARTS & HARDWARE HARDWARE BAGS BOLT, 1/4-20 X 3-1/2" SS ................8 BOLT, 1/4-20 X 3" SS ................... 24 BOLT, 1/4-20 X 2-3/4” SS ................36 BOLT, 1/4-20 X 2-1/2” SS ................2 BOLT, 1/4-20 X 2-1/4” SS ................1 BOLT, 1/4-20 X 2"...