Installation of the GPS Antenna. Symmetricom GPS Antenna

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Installation of the GPS Antenna. Symmetricom GPS Antenna | Manualzz

GPS Antenna Sets

Installation of the

GPS Antenna

4. Installation of the GPS Antenna

This chapter provides procedures to be performed when installing a GPS antenna

4.1. Selection of a Suitable Location

GPS signals don’t penetrate walls, roofs, solid metal structures or dense foliage. Tracking more satellites improves the GPS system performance. Typically at least 4 satellites are needed for start-up and at least 1 satellite continuously. For best results select an outdoor location providing as much unobstructed view to the sky as possible. Obstructions not rising more than 10° above the horizon can be ignored. Since the moving GPS satellites don’t cross the polar regions view towards the earth’s equator is preferable. Hence, in the northern hemisphere (Europe, North America, most of Asia) the sector E-S-W must be considered while in the southern hemisphere (Australia, South America) it’s W-N-E.

Rooftop mounting is ideal. Wall mounting may be acceptable, particulary at higher levels.

The figure shows different location options and their pros and cons are discussed below.

Position 1: Few obstructions towards the important region. Potential to track up to 8 satellites.

Best results.

Position 2: Some obstructions. Potential to track 4 to 6 satellites. Reasonable results.

Position 3: Many obstructions. Potential to track 1 to 4 satellites. Depending on time of day

(satellite constellation) start-up may be delayed significantly. Marginal results.

Position 4: GPS satellite signal blocked almost completely. Potential to track up to 2 satellites. No performance.

Lightning protection may be important. If the desired location is not within the area protected against direct strikes the building’s protection system must be modified accordingly. Local building codes may apply.

001023AD – July 2003 9

Installation of the

GPS Antenna

GPS Antenna Sets

4.2.1.

4.2.2.

Pre-Assembly of the Mounting Fixture

Install the mounting fixture at the upper end of the mast by putting two mounting brackets around the mast.

Fix it by using four plain washers and four nuts. (see sketch beside)

Fixing of the Mounting Tube

mounting fixture mounting bracket mast diameter

28 mm ... 60 mm

Install the mounting tube at the mounting fixture by using the clamp putting the other two mounting brackets around the mounting tube. Fix it by using four spacers and four nuts. (see sketch beside) mounting-tube mounting

brackets antenna-mast

(from customer) clamps

2 x spacer

10 001023AD – July 2003

GPS Antenna Sets

4.3.1. Pre-Assembly of the Mounting Fixture

Fix the mounting fixture with four suitable screws on the wall.

(see sketch beside)

mounting fixture

4.3.2. Fixing of the Mounting Tube

Fix the mounting tube with clamps by means of suitable long screws on the mounting fixture/wall.

(see sketch beside)

clamps wall mounting tube

Installation of the

GPS Antenna

001023AD – July 2003 11

Installation of the

GPS Antenna

4.4.

GPS Antenna Sets

Assembly of the GPS Antenna

Install the antenna base on the mounting tube and fasten it.

Feed the antenna cable through the mounting tube (bottom to top).

Assemble the connector according chapter 5. of this manual.

Connect the antenna cable to the GPS antenna.

Assemble the GPS antenna to the antenna base by fastening the four screws. antenna-top

N-connector antenna-base mounting-tube antenna-cable

12 001023AD – July 2003

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