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
BY RECIPIENT. DISCLOSURE TO UNAUTHORIZED THIRD PARTIES OR DUPLICATION WITHOUT THE EXPRESS WRITTEN PERMISSION OF QUAKE
GLOBAL IS PROHIBITED.
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3.3 Noise problems
To locate noise problems, start with a visual inspection of RF connectors. Look for water leakage
or corrosion. A spectrum analyzer, VSWR meter or noise detector is helpful for locating
problems. Noise sources for broadband may be electric power lines, electric motors or
generators, switching power sources or microprocessors. Noise sources for narrowband may be
radio/TV towers, pager transmitters or cell phones.
Figure 3-6: Noise - radiated and conducted
Noise suppression parts include ferrite beads, EMI cores and RF filters. Techniques include
twisting power lines, separating power from signal, using right angles, covering the band of
interest and double wrapping wire and placing it near the noise source.