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SPECIFICATIONS:

Model ........................................ 40M1L
Frequency Range tune able ...... 6.9-7.3 MHz X 200 kHz
*Gain, (FS) / Over gnd ............... 1.75 dBi / 7.2 dBi @ 70'
Front to side ............................... 15-20 dB Height depend
Beamwidth ............................... E = 84° H = N/A
Feed type ................................... Direct Feed
Feed Impedance........................ 50 Ohms Unbalanced
Maximum VSWR ....................... 2.0:1
Input Connector ......................... SO-239 Others avl.
FEATURES:
This simple antenna combines 15 years of design and field experience with CNC machined parts to become the worlds
best rotatable, reduced size dipole. Everything we have learned about linear loaded dipoles and structural reliability has
been designed into the 40M1L. We just stretched it a bit and broad banded it to cover at least 250 kHz or more. We also
have added an option to make it a dipole on 17 meters as well. The center insulator is a solid 1-1/4 inch fiberglass rod.
There is nothing here to weaken or break from the effects of sun, wind or ice loading.
The linear loading elements have been lifted slightly above the main element to eliminate the tension/compression prob-
lems of other designs. The linear loading also lifts the whole element slightly virtually eliminating droop. Newly designed
shorting bars make assembly and adjustment easier and quicker. If desired, optimizing inside the 40 meter band is done
with 1/2" tip adjustment. A Husky 1:1 balun delivers all your transmit power to the antenna with no feed line radiation or
pickup.
M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722
M2 Antenna Systems, Inc.
Model No: 40M1L
*Subtract 2.14 from dBi for dBd / FS = Free Space
Tel: (559) 432-8873 Fax: (559) 432-3059 Web: www.m2inc.com
©2014 M2 Antenna Systems Incorporated
Power Handling ......................... 3 kW Higher avl.
Boom Length / Dia ..................... N/A
Element Length / Dia. ................ 46' / 1 1/2" to 1/2"
Turning Radius: ......................... 23'
Stacking Distance ...................... 85' Max
Mast Size ................................... 2" to 3 " Nom.
Wind area / Survival .................. 3 Sq. Ft. / 100 MPH
Weight / Ship Wt. ....................... 22 Lbs. / 25 Lbs.
3/21/13
Rev.03

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Summary of Contents for M2 Antenna Systems 40M1L

  • Page 1: Specifications

    Everything we have learned about linear loaded dipoles and structural reliability has been designed into the 40M1L. We just stretched it a bit and broad banded it to cover at least 250 kHz or more. We also have added an option to make it a dipole on 17 meters as well.
  • Page 2 40M1L ASSEMBLY MANUAL A small container of zinc paste (Penetrox, Noalox, or equivalent) 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 other electrical connections are made.
  • Page 3 40M1L ASSEMBLY MANUAL the assembly together and the other two screws and locknuts can be added anytime. String on one cable clip and secure it near the shorting bars. Repeat for the other side of the element. Install the shaft retainers on the 3/16” rod ends beyond the arms using the 3/8 x 3” push tube.
  • Page 4 40M1L ASSEMBLY MANUAL Depending upon the final height of the dipole, the feed impedance can range from about 30 Ohms up to about 75 Ohms. This is normal and will not affect the performance of the antenna. 15. Note the 1/2” tip section has not been drilled. Note also that it is 60” long. You can insert the tip into the desired EXPOSED LENGTH.
  • Page 5 40M1L ASSEMBLY DETAILS...
  • Page 6 HALF ELEMENT W/17 METER ADD-ON KIT...
  • Page 7 GENERIC COMPRESSION CLAMP DETAIL...
  • Page 8 40M1L PARTS & HARDWARE DESCRIPTION ......................... QTY ELEMENT, 1-1/2 X .058 X 60 SOE ..................2 SLEEVE, 1-3/8 X .058 X 23 13/16" ..................2 ELEMENT, 1-1/4 X .058 X 60 SOE ..................2 ELEMENT, 1 X .058 X 24" ....................2 ELEMENT, 1 X .058 X 60 SOE ....................
  • Page 9 (17M KIT) OPTIONAL PARTS & HARDWARE DESCRIPTION ..................QTY ROD ELEMENT, 3/16” X 48” ALUM ..................2 HARDWARE: COUPLING BLOCK 1/2 X 1” ALUM ..................2 STANDOFF, DELRIN 1/2 X 2-1/4” TAPPED FOR 1/4-20 ............ 2 HOSE CLAMP, #12, MODIFIED WITH 1/4” HOLE ............. 2 BOLT, 1/4-20 X 1/2”, SS ......................