YDI Link CX-24 User Manual
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Contents
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Link CX-24 User’s ManualVersion 1.0 Page 13 February 2004direct signal path. The Fresnel zone surrounds the direct signal path, so it affects objects to the side ofthe path as well as objects directly in the path.For a calculation of the Fresnel Clearance Zone, please refer to:http://www.ydi.com/calculation/fresnel-zone.php.Multipath Fading: See Figure 2.1. Because a Link CX-24 terminal typically transmits its strongest signalsin a cone-shaped pattern, some of the signal may be reflected from a nearby building, from water underthe signal path, or from other RF reflectors. This reflected signal can then be received by the far-end LinkCX-24 and superimposed on the main signal, usually degrading the signal strength. To avoid multi-pathfading, YDI recommends that you install the Link CX-24 antenna on the back, rather than the front, ofbuildings to avoid multi-path fading from water or other ground-level surfaces, and that you plan radiolinks away from nearby buildings.Figure 2.1 – Preventing Multi-path Fading from Ground-Level SurfacesExternal Interference: Because the Link CX-24 operates in an unlicensed band, YDI stronglyrecommends that you use a spectrum analyzer at both ends of planned radio links, with the receivingantenna as close to the proposed Link CX-24 antenna mounting spot as possible. Use a polarizedantenna, and scan for both horizontally- and vertically-polarized interfering radiation. If you find externalinterference in either of the two (High or Low) bands, configure the Link CX-24 for the least-impactedband. Refer to Table 2.2 for the High and Low bands for the Link CX-24 radio.2.3 Site PlanningEach proposed Link CX-24 terminal site requires a site survey and plan for the following:Power: The Link CX-24 radio requires a +/-21 to +/-60 VDC power source. Make sure required powersupply is available before installing the Link CX-24.Mounting Point: The Link CX-24 is usually mounted on a vertical mast or pole mounted on a building ora tower. The Link CX-24 mounting bracket can accommodate a 4.5 to 7.6cm (1.75” to 3” OD) diametermast or pole.Grounding and Lightning Protection: The Link CX-24 radio requires adequate grounding and lightning |
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