User`s guide

Chapter 4 - Antenna Descriptions

driven rain from directly impinging on the connector mating area. This tubing should be secured

to the mounting nut of the antenna assembly and should extend several inches past the mating

N connectors. A product similar to Armstrong’s Armaflex Pipe Insulation Tubing products is

recommended. More information on this product can be found at

www.armaflex.com. Use a

weather resistant cable tie or clamp to secure the tubing material to the mounting nut.

Timing2000 Antenna Cable and Connector Requirements

The antenna module consumes five-volt power diplexed from the interconnecting coaxial cable. A

50 ohm coaxial cable is recommended for proper connection of the antenna module to the

receiver module. Note that for Motorola receivers such as the M12+, signal attenuation along the

cable should not exceed 8 dB at a frequency of 1575.42 MHz (the GPS L1 frequency). For RG-58

cables, the maximum cable length is restricted to approximately 12m to satisfy this 8 dB

requirement.

For long cable runs, cables specifically designed for use at microwave frequencies are

recommended. These cables are typically constructed with a low-loss foam dielectric between the

center conductor and the outer shield.

The Timing2000 antenna uses an industry standard female N connector. Weatherproof mating N-

connectors are required to ensure a water resistant seal. Some suggested cable connector

vendors are:

• AMP

• Amphenol

• Huber + Suhner

Motorola GPS Products - M12+ User's Guide Revision 6.X 09FEB05