M2 Antenna Systems 235-11 User manual

M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722
Tel: [phone] Fax: [phone] Web: www.m2inc.com
©2015 M2 Antenna Systems Incorporated 09/30/15
Rev.00
Model .........................................235-11
Frequency Range.......................230 To 240 MHz
*Gain ..........................................15.07 dBi
Front to back ..............................23 dB Typical
Beamwidth ...............................E=30 deg. H=35 deg.
Feed type ...................................“T” Match
Feed Impedance........................50 Ohms Unbalanced
Maximum VSWR........................1.5:1 Max
Input Connector..........................“N” Female
Power Handling..........................1200W
Boom Length / Dia......................141” / 1-1/2”
Maximum Element Length..........25-3/4”
Turning Radius:..........................80”
Stacking Distance.......................84” High & 80” Wide
Mast Size....................................1-1/2” to 2” Nom.
Wind area / Survival...................1.1 Sq. Ft. / 100 MPH
Weight / Ship Wt.........................8 Lbs. / 13 Lbs.
M2 Antenna Systems, Inc.
Model No: 235-11
FEATURES:
Performance has been computer optimized to meet your application. Physical construction
emphasizes long term electrical and mechanical durability. Elements are rod 5/16” 6061-T6 alumi-
num, grounded to the boom. The driven element “T” Match uses a CNC machined central block with
O-ring sealed connectors. Internal connections are encapsulated in a silicone gel with a dielectric
strength 3.7 times greater than air for enhanced power handling. Balun connectors are triple O-ring
sealed to the coax.
SPECIFICATIONS:
*Subtract 2.14 from dBi for dBd

TOOLS REQUIRED: Screwdriver, 11/32 wrench, socket or spintite, a 7/16" and 1/2" wrench
or socket, tape measure. For best results please review instructions before assembly.
1. Assemble the boom (SEE DIMENSION SHEET).
2. Install the boom to mast plate with two 2” U-bolts and cradles, placing it at about 53” from
the rear of the boom.
3. Layout the elements using dimension sheet and Install using 6-32 X 1” screws to hold
elements in place. Note: Leave Driven Element Rod screw lose until shorting bars are
positioned (SEE DRIVEN ELEMENT DETAIL PAGE).
4. Install Driven Element Assembly & Shorting Bars.
(SEE DRIVEN ELEMENT DETAIL PAGE & DIMENSION SHEET).
5. Install the two gold SEAL NUTS on the Driven Element Balun connectors with the black
neoprene face out. Locate the 1/2 wavelength balun cable assembly and form into a large "U"
shaped loop. Tighten up the 7/16" balun connector nuts gently with a 7/16" end wrench first.
Then run the seal nuts up against the face of the connectors and tighten about 1/2 turn more
with a 1/2" end wrench. Tuck Balun into rear of boom and secure.
6. Install the feed line. Route feed line on the underside of boom towards Boom to Mast Plate
and secure with nylon ties.
This completes the assembly.
M2ANTENNA SYSTEMS, INC.
4402 N. Selland Ave.
Fresno, CA 93722
[phone] FAX: [phone]
www.m2inc.com Email: [email protected]
235-11 ASSEMBLY MANUAL

2M4 ASSEMBLY MANUAL
235-11 DIMENSION SHEET

235-11 DRIVEN ELEMENT DETAIL
NOTE:
TUCK BALUN INTO REAR OF BOOM AS SHOWN BELOW.
SECURE WITH TAPE OR NYLON TIES.

235-11 BOOM TO MAST PLATE DETAIL

DESCRIPTION QTY
BOOM SECTION #1, 1-1/2” X .058 X 60” SOE...................................................... 1
BOOM SECTION #2, 1-1/2” X .058 X 60” SOE...................................................... 1
BOOM SECTION #3, 1-1/2” X .058 X 27”............................................................... 1
ELEMENT ROD, 5/16” X SEE DIM SHEET............................................................ 11
DRIVEN ELEMENT ASSEMBLY............................................................................ 1
BALUN CABLE, RG-6U X 22-1/2” .......................................................................... 1
SHORTING BAR, 3/4” X 1/4” X 1-7/8”.................................................................... 2
BOOM TO MAST PLATE, 4 X 6 X 1/4” (M2APT0022) ........................................... 1
U-BOLT AND CRADLE, 2” ..................................................................................... 2
U-BOLT AND CRADLE, 1-1/2” ............................................................................... 2
ASSEMBLY MANUAL............................................................................................. 1
HARDWARE
NUT, 5/16-18 SS..................................................................................................... 8
LOCKWASHER 5/16 SS......................................................................................... 8
SCREW, 8-32 X 1-3/4”, SS..................................................................................... 5
SET SCREW, 8-32 X 1/4”,SS................................................................................. 4
LOCKNUT, 8-32, SS............................................................................................... 4
SCREW, 6-32 X 1”,SS............................................................................................ 15
SEAL NUT, 3/8-32 .................................................................................................. 2
ALLEN WRENCH 5/64 ........................................................................................... 1
NYLON TIES LARGE ............................................................................................. 5
Carefully designed and manufactured by:
M2ANTENNA SYSTEMS, INC.
4402 N. Selland Ave.
Fresno, CA 93722
[phone] FAX: [phone]
www.m2inc.com Email: [email protected]
2M4 ASSEMBLY MANUAL
235-11 PARTS & HARDWARE