Assembling the OMNI-B Series Antenna Kit
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Assembling the OMNI-B Series Antenna Kit
Federal Signal www.fedsig.com
• Flat file or rotary cut-off 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 Figure 1,
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
50 in-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 15 in-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-off 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 off.
• 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 15 in-lb.
8. See Figure 1, Detail A. Apply any remaining grease to the inside surface of the bracket.
The antenna is ready for installation.
