M2 Antenna Systems FD35.5 User manual

M2 Antenna Systems, Inc. 4402 N. Selland Ave. Fresno, CA 93722
Tel: [phone] Fax: [phone] Web: www.m2inc.com
©2022 M2 Antenna Systems Incorporated 08/16/22
Model .........................................FD35.5
Frequency Range.......................35-36 MHz
Gain............................................6.5 dBi / 4.36 dBd
Front to back ..............................10 dB Typical
Beamwidth ...............................E=130° (Azimuth)
Feed type ...................................“T” Match
Feed Impedance. .......................50 Ohms
Maximum VSWR........................< 1.5:1
Polarity........................................Vertical
Input Connector..........................“N” Female
Power Handling ..........................1 kW
Element Length ..........................131”
Mounting.....................................2” Mast
Wind Survival .............................100 MPH
Weight / Ship Wt.........................45 Lbs. / 55 Lbs.
M2 Antenna Systems, Inc.
Model No: FD35.5
FEATURES:
The FD35.5 Dipole antenna offers performance characteristics for specialized operations within the 46-36 MHz region.
The FD35.5 Dipole produces a smooth, vertically polarized pattern. No rotation or steering is required. The FD35.5
Dipole’s rugged, weatherproof construction suits mobile and marine applications as well as fixed, land based installations
in hostile environments.
SPECIFICATIONS:
*Subtract 2.14 from dBi for dBd

35.5 MHz Dipole Assembly Manual
TYPICAL TOOLS REQUIRED: 7/16, 1/2 spin-tight, end wrenches and or sockets and large adjustable wrench.
NOTE, ZINC PASTE HAS BEEN SUPPLIED TO ADD LIFE TO THE CONNECTIONS IN THIS ANTENNA. IT
CAN ALSO BE USED ON ALL THREADS AS ANTI-SEIZE COMPOUND.
1. Assemble the DIPOLE AND OPTIONAL REFLECTOR referring to the ASSEMBLY DETAIL drawing. Bolt
sizes and other details should make assembly very straight forward. Tighten all 1/4-20 hardware to 10 inch
pounds of torque except on the balun. Hold the bottom nut on each balun stud while tightening the top nut
securely.
2. Use good quality 50 Ohm coax such as Times Wire and Cable LMR-400 or larger.
3. The Mast or Tower leg clamp assembly will accommodate up to 6” diameter tube. It can also be tilted
DOWN as much as 15 degrees to accommodate a tapered tower leg configuration. Install the 2” machined
saddles for the antenna boom. Use bolts, 5/16-18 x 3-1/2” with flat washers on each side and 5/16-18 lock
nuts. Slide in the boom so it just protrudes past the second saddle set, align the dipole vertically (or
horizontally) and tighten the 5/16” nuts. Now position the plate so the antenna boom is at the bottom of the
plate. The large saddles for the mast / tower leg attach on the opposite side of the plate. Mount the
assembly on the tower leg or mast and adjust the dipole perpendicular to the horizon. Then tighten the 1/2”
bolt assemblies. Add the two extra nuts to “jam” the assembly for sever vibrations.

35.5 MHz DIPOLE WITH OPTIONAL REFLECTOR
BALUN LEADS
INSTALLATION DETAIL
FORM BALUN LEADS
AS SHOWN IN PICTURE

PARTS LIST 35.5 MHz DIPOLE AND OPTIONAL REFLECTOR
DESCRIPTION QTY
Boom, 2” x .125 x 84” ...................................................................... 1
Dipole Element, 1” x .058 x 72” ....................................................... 2
Reflector Element, 1” x .058 x 82” ................................................... 2
Center Insulator, 7/8 x 30” Fiberglass Rod ...................................... 1
Ring Clamp, 2” Machined ................................................................ 2
Balun, 330 (38” wires) 30-100 MHz ................................................. 2
Balun Leads, 1/2” x 4-3/8” x .062..................................................... 1
Mounting Plate, Balun Aluminum..................................................... 1
U-Bolt and Saddle, 2” ...................................................................... 1
U-Bolt and Saddle, 2-1/2” (Balun).................................................... 1
Mast Plate, Steel (Plated with Slot) ................................................. 1
Saddle, 2” Machined ....................................................................... 4
Large Saddle Clamp (for mast or tower leg mounting) .................... 2
Assembly Instructions...................................................................... 1
HARDWARE
Threaded Rod, 1/2-13 x 12” Zinc..................................................... 2
Nut, 1/2-13 SS ................................................................................. 6
Lock Washer, 1/2” Split Ring ........................................................... 4
Flat Washer, 1/2” SS ....................................................................... 4
Bolt, 5/16-18 x 3-1/2” SS ................................................................. 4
Lock Nut, 5/16-18 SS....................................................................... 4
Nut, 5/16-18 SS ............................................................................... 4
Lock Washer, 5/16” SS.................................................................... 4
Flat Washer, 5/16” SS ..................................................................... 8
Bolt, 1/4-20 x 2” SS.......................................................................... 4
Bolt, 1/4-20 x 1-3/4” SS ................................................................... 2
Bolt, 1/4-20 x 1” SS.......................................................................... 2
Lock Nut, 1/4-20 SS......................................................................... 4
Lock Washer, 1/4” Split Ring SS ..................................................... 2
Flat Washer, 1/4” SS ....................................................................... 2
Penetrox Paste, Cup........................................................................ 1
M2 Antenna Systems, Inc.
4402 N. Selland Ave.
Fresno, CA 93722
[phone] FAX: [phone]
www.m2inc.com Email: [email protected]