User Manual Part 1

User Guide to Q4000/QPRO

Document Number 1135-4713 Rev G

THIS DOCUMENT CONTAINS CONFIDENTIAL AND PROPRIETARY INFORMATION OF QUAKE GLOBAL CORPORATION. IT MAY BE USED BY

RECIPIENT ONLY FOR THE PURPOSE FOR WHICH IT WAS TRANSMITTED AND WILL BE RETURNED UPON REQUEST OR WHEN NO LONGER NEEDED

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Page 28

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Figure 3-3: Ground Plane

Table 3-2: Antenna wavelength and gain

Antenna Gain (dB)

Whip

¼, 1/2 , 5/8

Unity

(0)

1/8

4dB

Low Profile

2 to

Quad

Helix

Dipole *

+3 to +6

3.1.2 GPS

The GPS antenna should be 3.3 VDC active. For long cable lengths, we recommend gain of 25

dB in the Low Noise Amplifier. Ensure that the GPS antenna is located so it has an unobstructed

view of the sky. Active antennas are usually low-profile patch types.

Frequency

λλ

137-138 MHz 2.2 m 85.9 in 42.9 in 21.5 in

148-150 MHz 2 m 79.3 in 39.6 in 19.8 in

λλ