M2 Antenna Systems 2M18 series Assembly Manual
M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722
Tel: (559) 432-8873 Fax: (559) 432-3059 Web: www.m2inc.com
©2015 M2 Antenna Systems Incoporated
05/26/15
Rev.00
Model ......................................... 2M18XXX
Frequency Range ....................... 144 To 146 MHz
*
Gain for 1 / 2 / 4 ........................ 17.14 / 20.14 / 23.14 dBi
Front to back .............................. 26 dB Typical
Beamwidth ............................... E=26° H=28°
Feed type ................................... “T” Match
Feed Impedance. ....................... 50 Ohms Unbalanced
Maximum VSWR ........................ 1.2:1
Input Connector .......................... “N” Female
Power Handling .......................... 1.5 kW
Boom Length / Dia ...................... 36.5’ / 1-1/2” to 3/4”
Maximum Element Length .......... 41”
Turning Radius: .......................... 19’ 6”
Stacking Distance ....................... 14’ High & 14.5’ Wide
Mast Size .................................... 2” Nom.
Wind area / Survival ................... 2.9 Sq. Ft. / ?? MPH
Weight / Ship Wt. ........................ 14 Lbs. / 16 Lbs.
M2 Antenna Systems, Inc.
Model No: 2M18XXX
FEATURES:
The 2M18XXX has been extensively used by many moonbouncers and other weak signal enthusiasts for
the last eight years. The clean, sharp pattern yields a very good G/T (gain/temperature in K) which, in everyday
language, means you
hear more signal and less noise.
It is ideal as a single antenna or in stacked arrays of 24 or
more antennas, yielding a
full 6 dB
of stacking gain for four antennas! Mechanically, the boom is strong in the mid-
dle and tapered in 1/4” steps to reduce weight and wind area. M
2
has integrated the computer optimized design
with the unique driven element module. The aluminum CNC machined housing features “O” ring seals on all three
connectors and internal connections are potted in silicon gel than enhances the power handling capability. That is
important to those who feel life is too short for QRP (Low power)! All hardware is stainless except the U-bolts. By all
standards the “18XXX” is a true thoroughbred among VHF antennas!
SPECIFICATIONS:
*Subtract 2.14 from dBi for dBd
Gain for single antenna
Gain for two atennas
stacked vertically as pictured
Gain for 4 antennas
stacked 2 x 2