Federal Signal Corporation OMNI-B Series User manual
Introduction
This instruction sheet describes how to assemble the OMNI-B Series Antenna Kit. For more information,
see the Yagi and Omni Antennas Installation manual at http://www.fedsig.com (part number 25500445).
INSTALLATION PRECAUTIONS: Installation should be performed by an experienced electrician
or qualied radio technician. Keep antenna away from metal objects and power lines.
BURN HAZARD: Antennas may cause severe burns. Do not touch the antenna while the radio is
transmitting.
INSTALLATION PRECAUTIONS: Radio and antenna installation must conform to the system’s
FCC (or equivalent) license, which species the RF frequency, modulation, RF power, antenna
location, and mounting height. Do not operate the radio system until the installation has been
conrmed to comply with the license.
The following table list the common components included in the kit.
Table 1 Contents
Item Qty Description
1 1 Antenna Base with Gasket
2 1 NMO Mount/Adapter
3 1 O-ring
4 1 Die-cast Antenna Bracket
5 4 8-32 Stainless Steel Socket Self-lock Set Screw
6 4 Radial, GND Plane
7 1 Lockwasher, Internal Tooth
8 1 5/8" Flat Washer
9 1 Lockwasher, Internal Tooth, Thin
10 1 5/8"-24 Hex Nut
11 1 5/16"-18 Stainless Steel Self-lock Set Screw
12 4 Protective Rubber Cap
13 1 Radiator Whip
Not Shown 2 15/16" Heat Shrink Tubing
Not Shown 1 Dielectric Grease Tube
Not Shown 1 5/64" Hex Key
Not Shown 1 5/32" Hex Key
Not Shown 1 3/32” Hex Key
Tools Required
The following tools are required for assembly:
• 3/4 inch or 19 mm deep well socket and wrench
Assembling the OMNI-B Series
Antenna Kit
25500860 Rev A1 0923
Assembling the OMNI-B Series Antenna Kit
2Assembling the OMNI-B Series Antenna Kit
Federal Signal www.fedsig.com
• Flat file or rotary cut-o wheel. (Only needed for shortening the whip on the OMNI-BVH when using
frequencies > 168-174 MHz).
Assembling the Antenna
To assemble the antenna:
1. Open the parts bag and locate the five set screws (Items 5 and 11). Using the supplied hex keys,
thread the set screws into the die-cast bracket with just a couple of turns. You will tighten the screws
fully in a later step.
2. Apply a thin coat of grease to the unpainted surface at the center of the bracket shown in Figure1,
Detail A.
3. Assemble the NMO mount and hardware (Items 2, 3, 7, 8, 9, and 10) to the die-cast bracket, as shown
in Figure 1, Detail B. Tighten the hex nut with a 3/4 inch or 19 mm socket wrench to approximately
50in-lb.
4. Apply a small amount of grease to the threads on the antenna base, as shown in Figure 1, Detail C.
Attach the antenna base to the NMO mount and tighten it securely by hand.
5. See Figure 1, Detail A. Apply a small amount of grease to each of the four radial mounting locations
on the bracket. See Figure 1, Detail D. Slip the rubber caps onto one end of each ground radial. See
Figure 1, Details B and E. Insert the GND radials into the bracket and tighten the 8-32 set screws to
approximately 15in-lb.
NOTE: The OMNI-BUH Model has a mix of long and short length radials. The short radials are located
on the side with the Federal Signal logo.
6. When the OMNI-BVH Model is used for frequencies > 168-174 MHz, the 14-inch whip included in the
kit must be trimmed to 13 inches.
To trim the whip:
• Use a flat file or a rotary cut-o tool to make a nick in the whip 13 inches from the tip of the
ball end. (This should be right at the start of the unpainted part of the whip.)
• Grab the whip on each side of the nick and snap the end o.
• File the end smooth to remove any burrs.
• Scrape the paint from the end of the whip to expose 1 inch of bare metal.
7. See Figure 1, Detail F. Apply a small amount of grease to the end of the whip and then insert it into
the antenna base. Tighten both the set screws to approximately 15in-lb.
8. See Figure 1, Detail A. Apply any remaining grease to the inside surface of the bracket.
The antenna is ready for installation.
Assembling the OMNI-B Series Antenna Kit
3
Assembling the OMNI-B Series Antenna Kit
Federal Signal www.fedsig.com
Figure 1 Exploded View
13
DETAIL B
1
2
3
4
5
11
7
10
8
ANTENNA
GASKET
9
6
ASSEMBLY STEPS:
OPEN PARTS BAG AND LOCATE THE FIVE SET SCREWS (ITEMS 5 AND 11).
1.
USING THE SUPPLIED HEX KEYS, THREAD THE SET SCREWS INTO THE DIE-
CAST BRACKET JUST A COUPLE OF TURNS. THEY WILL BE FULLY
TIGHTENED LATER.
APPLY A THIN COAT OF GREASE TO THE UNPAINTED SURFACE AT THE
2.
CENTER OF THE BRACKET AS SHOWN IN DETAIL A.
ASSEMBLE THE NMO MOUNT & HARDWARE (ITEMS 2, 3, 7, 8, 9, AND 10)
3.
TO THE DIECAST BRACKET AS SHOWN IN DETAIL B. TIGHTEN HEX NUT WITH
3/4" OR 19MM SOCKET WRENCH TO APPROXIMATELY 50 IN-LBS.
APPLY A SMALL AMOUNT OF GREASE TO THE THREADS ON THE ANTENNA
4.
BASE AS SHOWN IN DETAIL C. ATTACH THE ANTENNA BASE TO THE NMO
MOUNT AND TIGHTEN IT SECURELY BY HAND.
SEE DETAIL A. APPLY A SMALL AMOUNT OF GREASE TO EACH OF THE
5.
FOUR RADIAL MOUNTING LOCATIONS ON THE BRACKET.
SEE DETAIL D. SLIP THE RUBBER CAPS ON TO ONE END OF EACH GROUND
RADIAL. SEE DETAIL VIEWS B & E. INSERT THE GND RADIALS INTO THE
BRACKET AND TIGHTEN THE 8-32 SET SCREWS TO APPROXIMATELY 15 IN-
LBS. *NOTE THAT THE OMNI-BUH MODEL HAS A MIX OF LONG AND SHORT
LENGTH RADIALS. THE SHORT RADIALS LOCATED ON THE SIDE WITH THE
FS LOGO.
A SPECIAL STEP IS REQUIRED WHEN THE OMNI-BVH MODEL IS USED FOR
6.
FREQUENCIES >168-174MHz. SKIP THIS STEP FOR ALL OTHER
APPLICATIONS. THE 14" WHIP WILL NEED TO BE TRIMMED TO 13". TO TRIM
THE WHIP, USE A FLAT FILE OR ROTARY CUT OFF TOOL TO MAKE A NICK IN
THE WHIP 13" FROM THE TIP OF THE BALL END (THIS SHOULD BE RIGHT AT
THE START OF THE UNPAINTED SECTION). GRAB HOLD OF THE WHIP ON
EACH SIDE OF THE NICK AND SNAP THE END OFF. FILE THE END SMOOTH
TO REMOVE ANY BURRS. SCRAPE THE PAINT FROM THE END OF THE WHIP
TO EXPOSE 1" OF BARE METAL.
SEE DETAIL F. APPLY A SMALL AMOUNT OF GREASE TO THE END OF THE
7.
THE WHIP AND THEN INSERT IT INTO THE ANTENNA BASE. TIGHTEN BOTH
SET SCREWS TO APPROXIMATELY 15 IN-LBS.
SEE DETAIL A. APPLY ANY REMAINING GREASE TO THE INSIDE SURFACE
8.
OF THE BRACKET. ANTENNA IS READY FOR INSTALLATION.
DETAIL A
THIN COAT OF
GREASE ON
UNPAINTED AREA.
APPLY THIN
COAT OF
GREASE TO
INSIDE
SURFACE.
APPLY SMALL
AMOUNT OF
GREASE
PRIOR TO
INSERTING RADIALS
(4 PLACES).
DETAIL C
APPLY THIN
COAT OF
GREASE TO
THREADS ONLY.
DETAIL D
12
SLIP THE
RUBBER CAPS
ONTO THE
ENDS OF THE
FOUR RADIALS.
DETAIL E
TOP VIEW
*SEE NOTE 5
LONG
RADIAL
SHORT
RADIAL*
LONG
RADIAL
SHORT
RADIAL*
DETAIL F
WHIP
SET
SCREWS
APPLY
GREASE
ITEM
QTY.
DESCRIPTION
1 1
ANTENNA BASE WITH GASKET
2 1
NMO MOUNT/ADAPTER
3 1
O-RING
4 1
DIE-CAST ANTENNA BRACKET
5 4
SCREW, SET, 8-32, SS, SELF-LOCK
6 4
RADIAL, GND PLANE
7 1
LOCKWASHER, INT TOOTH
8 1
FLAT WASHER, 5/8
9 1
LOCKWASHER, INT TOOTH, THIN
10 1
HEX NUT, 5/8-24
11 1
SCREW, SET, 5/16-18, SS, SELF-LOCK
12 4
PROTECTIVE RUBBER CAP
13 1
RADIATOR / WHIP
NOT
SHOWN
2
HEAT SHRINK TUBING, 15/16" ID
NOT
SHOWN
1
DIELECTRIC GREASE TUBE
Assembling the OMNI-B Series Antenna Kit
4Assembling the OMNI-B Series Antenna Kit
Federal Signal www.fedsig.com
© Copyright 2023 Federal Signal Corporation
All product names or trademarks are properties of their respective owners.
Figure 2 Typical Antenna Pole Mount Installation
16" MIN.
LOCATE THE ANTENNA
BRACKET ON THE 1" NPS
(1.31" O.D.) PIPE OF THE
ANTENNA MOUNT.
TIGHTEN THE 5/16"-18 SET SCREW.
TO 50-75 IN-LB TO SECURE THE
ANTENNA BRACKET.
SERVICE
LOOP
SEAL COAX CONNECTION
WITH HEAT SHRINK OR
TAPE AND SEAL WITH
SCOTCH COAT OR
EQUIVALENT.
EARTH GND
CONNECTION
NOTE: THE OMNI-BUH ASSEMBLY HAS SHORT GND RADIALS
LOCATED ON THIS SIDE OF THE ASSEMBLY.
Getting Service
If you are experiencing any diculties, contact Federal Signal Customer Support at 800-548-7229 or
708-534-3400 extension 7511 or Technical Support at 800-524-3021 or 708-534-3400 extension 7329
http://www.fedsig.com.
Limited Warranty
This product is subject to and covered by a limited warranty, a copy of which can be found at
www.fedsig.com/SSG-Warranty. A copy of this limited warranty can also be obtained by written
request to Federal Signal Corporation, 2645 Federal Signal Drive, University Park, IL 60484, email to
This limited warranty is in lieu of all other warranties, express or implied, contractual or statutory,
including, but not limited to the warranty of merchantability, warranty of fitness for a particular purpose
and any warranty against failure of its essential purpose.
2645 Federal Signal Drive
University Park, Illinois 60484
www.fedsig.com
Customer Support 800-548-7229 • +1 708 534-3400
Technical Support 800-524-3021 • +1 708 534-3400
This manual suits for next models
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