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For example, at a frequency of 615 GHz (l = 0048 m) and a = 1 , h = 14 m (for n = 0), and h = 419 m (for n = 1) The distance between antennas will depend on their diameter 38 Repeaters
In cases where a direct microwave path cannot be established (ie, there is no line of sight) between two points, it is possible to establish a path by using a repeater The function of such a repeater is to redirect the beam so as to pass the microwave beam around or over the obstacle (eg, a building or hill) The main requirement is that there should be a clear line of sight between the repeater and both sides of the microwave link This could be an active repeater (two microwave radios connected back to back) if distances are long, or a passive repeater if distances are relatively short
381 Active Repeaters
An active MW repeater site contains two complete microwave radio terminals (connected back to back), antennas, waveguides or coax cables, and other components, and it is a much more costly solution than the passive repeater described in the next section It requires an enclosure for the equipment, power plant, an antenna-mounting structure of some kind, and so on The best way to avoid use of active microwave repeater sites is to carefully plan and execute the microwave network design and strategically place sites in such a way that they all have a LOS with at least one other site Active repeaters are used not only in the case of obstructed LOS but also when terminal stations are too far for one microwave hop Two sites that are 100 mi apart can be typically connected using three, four, five, or even more active microwave repeater stations, depending on the frequency, terrain (LOS), type of equipment (radios and antennas) used, and so forth
382 Passive Repeaters
There are two types of passive repeaters in use One consists of two parabolic antennas connected back to back through a short piece of transmission line The other, more commonly used, is a plane reflector, flat billboard-type metal reflector that acts as a microwave mirror
Microwave Link Design
Passive repeaters are used to change the direction of the radio-relay signal so as to overcome obstacles in an otherwise direct line of sight between two microwave (radio-relay) stations13 They are also employed when the cost as compared with an active repeater is too high A passive repeater is not only less expensive to build than an active repeater, but the operation cost is also substantially reduced Passive repeaters have a major advantage over active repeaters from the ecology standpoint since it is not necessary to provide access roads and power line rights of way to the repeater site They require minimal maintenance and can be visited by horseback, foot, or helicopter when necessary In addition, passive repeaters are almost always less expensive to install and operate, while offering high reliability
3821 Billboard Repeater Plane reflectors reflect the microwave signal
in the same way mirrors reflect light A single-plane reflector (single billboard) consists of a flat reflexive surface that changes the ray direction to avoid the obstacle (see Figure 314) The performance of this setup is given by the reflector surface (height and width) and the angle formed between the incident and reflected ray Although historically used for low-frequency bands 2-11 GHz, today some manufacturers are actually producing high-performance passive repeaters for frequencies above 11 GHz The size of the passive plane (billboard) repeaters can vary from 8 10 ft (2,300 lb) to 40 60 ft (45,000 lb) in size Passive repeaters are typically designed to withstand wind speed of 125 mph High-wind models based on 240 mph wind survival can be ordered in areas known to have severe wind conditions Cold climate models are designed for radial ice in addition to required wind speed
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