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SPECIFICATIONS:
Model ........................................ 20M4DX
Frequency Range / Gain ........... 14.0 To 14.350 / 7.3 dBd
Frequency Range / Gain ........... 14.0 To 14.275 / 7.6 dBd
Front to back .............................. 23 dB
Beamwidth ............................... E=58° / H=78°
Feed type ................................... Hair pin match
Feed Impedance........................ 50 Ohms Unbalanced
Maximum VSWR ....................... 1:1
Input Connector ......................... SO-239
FEATURES:
The 20M4DX is the first in a NEW SERIES of mid-sized, UPS shippable HF antennas for all bands from 20 meters to 10
meters. Computer designed and VERIFIED with NEC, you will soon see the GAIN and other characteristics advertised in
QST magazine. That should separate the players real fast! A very clean pattern makes it ideal for STACKING (3 dB OF
STACKED GAIN!). We now spec FRONT TO REAR which defines the pattern from 90 to 270 degrees. On your request
we can supply E and H patterns in free space or over ground. Careful, computer aided mechanical design for LOW
WIND AREA, yet long term electrical and mechanical integrity are assured with CNC machined element-to-boom ring
clamps and other key components. The Teflon coax 1:1 balun and rugged, low loss hairpin match insure all you power
gets to the airwaves! With a little thought, you WILL choose M
M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722
M2 Antenna Systems, Inc.
Model No: 20M4DX
Tel: (559) 432-8873 Fax: (559) 432-3059 Web: www.m2inc.com
©2014 M2 Antenna Systems Incorporated
Power Handling ......................... 5 kW
Boom Length / Dia ..................... 34' 8" / 2-1/2"
Element Length / Dia. ................ 35 Ft. / 1" To 3/8"
Turning Radius: ......................... 25 Ft.
Stacking Distance ...................... 56 Ft.
Mast Size ................................... 2" to 3" Nom.
Wind area / Survival .................. 6.9 Sq. Ft. / 85 MPH
Weight / Ship Wt. ....................... 56 Lbs. / 61 Lbs.
2
. Contact your favorite dealer for pricing.
08/6/12
Rev.02
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Summary of Contents for M2 Antenna Systems 20M4DX
- Page 1 FEATURES: The 20M4DX is the first in a NEW SERIES of mid-sized, UPS shippable HF antennas for all bands from 20 meters to 10 meters. Computer designed and VERIFIED with NEC, you will soon see the GAIN and other characteristics advertised in QST magazine.
- Page 2 20M4DX ASSEMBLY MANUAL Note: A cup of zinc paste (PENETROX, NOALOX, or equivalent) has been provided to enhance the quality of all the electrical joints and make assembly and disassembly easier. Apply a thin coat wherever two pieces of aluminum come in contact. Use it also to lube the stainless screws and bolts.
- Page 3 20M4DX ASSEMBLY MANUAL 9. Now, if you haven’t already done so, attach the 3/4, 1/2” and 3/8” element sections to the 1” tubes at the correct location. Secure with 8-32 x 1-1/4” screws and locknuts. Repeat for all elements. MAKE SURE TIPS LENGTHS ARE IN THE RIGHT ELEMENT POSITIONS! 10.
- Page 4 20M4DX DIMENSION SHEET...
- Page 5 20M4DX ASSEMBLY DETAIL...
- Page 6 GENERIC COMPRESSION CLAMP DETAIL...
- Page 7 20M4DX VSWR PLOTS Below is the E plane, the H plane and the GAIN and VSWR plots for the FULL BAND tuning adjustments. If LO FONE/CW tuning adjustments are chosen the gain will go up slightly and the VSWR curve will flatten to 1.5: or better at the tuning edges.
- Page 8 20M4DX PARTS & HARDWARE DESCRIPTION Boom section, 2-1/2” x .065 x 55” STR ............1 Boom section, 2-1/2” x .065 x 95” SOE ............4 Element section, 1-1/4” x .058 x 60” SBE ........... 1 Element section, 1” x .049 x 60” TYPE I swaged one end (SOE) ....2 Element section, 1”...
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