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Figure 3-24 Microwave path pro le
i 8m ht 1 B f sig 144 d o Line th loss Pa
3
ft Voice data in/out Multiplexer demultiplexer
13 GHz Transceiver Transceiver Multiplexer demultiplexer Voice data in/out
groups of frequencies: C, D, E, and F Note that group F can handle only 32 VHF carriers (2-M) This AML system used by cable operators is called community-antenna radio service (CARS) band and is in the frequency band of 127 to 1295 GHz Of the groups in Table 3-3 from D33 to F32 use is speci ed for studio transmitter link (STL) service This AML service is used for connecting the studio facilities, usually in a city, to the transmitter or uplink site outside of the city The antenna systems used at these frequencies are usually dish type (parabolic) from 4 to 10 ft in diameter The transmitting antenna may be 10 ft, and the receiving antenna size may be 6 ft in diameter As in satellite antennas, the larger the diameter the greater the antenna gain A diagram of the basics is shown in Figure 3-24 Now, several other factors that add to this loss have to be considered
352 Telephone Microwave Radio Link Applications
The microwave-radio link has been used by the telephone industry to transmit and receive telephone traf c for many years Early systems used the carrier method of single-sideband suppressed-carrier modulation for transmission of a one-way (half-duplex) telephone call A carrier operating on another carrier going the other direction carried the other half of the call This technique is known as frequency division multiplexing (FDM) Later, telephone voice signals were converted to nonreturn to zero (NRZ) digital pulse streams, referred to as time-division multiplexing (TDM) Both methods were used to stack voice channels on one RF microwave carrier This carrier is a major concern and should be received at the
Headends and Signal Processing
receiving site in the best possible condition The basic microwave link for one path is shown in Figure 3-24 Path length L 18 miles path loss (366 366 366 14398 144 dB This loss assumes nothing is in the pathway and there is no signal refraction 3521 The wave front from the transmitting antenna expands as it travels through space, which results in re ections and phase changes as the wave passes over obstacles and obstructions Extra height of the transmitting and receiving sites should be allowed The beam cross section shows rst, second, and third Fresnel zones as concentric bands around the beam center axis, as shown in Figure 3-25 These formulas are used to adjust tower heights and site elevations so objects or obstructions do not penetrate the rst Fresnel zone 3522 The procedure of path pro ling is to make sure that the transmitting and receiving site is clear of obstructions and that the path or beam, taking into account the Fresnel zones, is far enough above the Earth s 20 log L 20 log 18 251 823 20 log ft) dB 20 log 13,000
Figure 3-25 Fresnel zones
Fr3 Fr2 Fr1 1st 2nd 3rd Obstruction d1 Transmitter site d2 Receiving site
3
surface to be unaffected This procedure might require some on-site work with surveying instruments However, reasonable estimates can be made using 75-minute topographical maps and appropriate graph paper Also, sea-level refractivity contour charts as well as K factor versus refractivity might be helpful in estimating the K factor for the area A short example illustrates this procedure as shown in Figure 3-26 To correct this gure for points x and y, we can use the formula or the graph in Figure 3-27 At point y, Fresnel radius is 090 of mid-span value of 424 ft So, 090 424 ft 38 ft At this point, the bulge of the Earth penetrates
Example 3-4
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