100 ' ********************************* 110 ' * IBM PC BASIC VERSION A3.30 * 120 ' * FILE NAME "ROUT" * 130 ' * PLANNING RELAY ROUTE * 140 ' * 1987/10 I.KATO * 150 ' ********************************* 160 KEY OFF:CLS:SCREEN 9 170 COLOR 14 180 LOCATE 1,1:PRINT "[ITEM 7] PLANNING OF RELAY ROUTE":COLOR 7 190 PRINT "The work begins with the study of a map. The selection of sites should be care-fully examined in view of not only propagation features but also construction " 200 PRINT "and maintenance conveniences including future expantion capabilities. There are many fundamental considerations as mentioned below." 220 COLOR 3:PRINT "(1) Relay distance":COLOR 7 230 PRINT "All spans should be as equal as possible in distance. By doing so, a well bal- anced noise budget will be expected between thermal and interference noises." 240 COLOR 3:PRINT "(2) Path clearance":COLOR 7 245 PRINT "Path clearance to pass larger than 2/3 of the radius of the first Fresnel zoneshould be protected from possible variation in the value of k." 250 COLOR 3:PRINT "(3) Ground reflection":COLOR 7 260 PRINT "A ground-reflected wave is a cause of serious fading and propagation distortion."; 270 PRINT "So, the utmost effect should be firstly tried to intercept a ground-reflected wave by means of a shielding-ridge. If not, means should be examined to shift" 280 PRINT "the reflection point onto undulate hills, mountains or urban area, away from the water surface and paddy fields." 290 COLOR 3:PRINT "(4) Relay angle":COLOR 7 300 PRINT "Alignment of all the relay stations could from the shortest relay route, which may be, however, inevitably subject to over-reach interference within the same" 310 PRINT "route insofar as the two frequency repetition system is employed." 315 PRINT "Over a plane earth a zig-zag formation will make a good use of the directivity of antenna to minimize over-reach interferences." 320 COLOR 6:LOCATE 23,50:PRINT "--To proceed: Hit space key--" 330 COLOR 7:Q$=INKEY$:IF Q$<>" " THEN 330 340 CLS:GOSUB 1000:GOSUB 2000 350 COLOR 3:LOCATE 1,1:PRINT "(5) Frequency coincidence":COLOR 7 360 PRINT "The two frequency repetition system is preferred for " 370 PRINT "an ordinary frequency planning in view of spectrum " 380 PRINT "economy." 390 PRINT "In this system, a pair of frequencies, f1 and f2, are" 400 PRINT "bidirectionally assigned one after the other for the " 410 PRINT "same both-way radio bearer." 420 PRINT "The adoption of this system, however, requires " 430 PRINT "particular frequency planning arrangement for a later" 440 PRINT "stage, upon new installation of other routes." 450 PRINT "For instance, a 6GHz band terminal station has been " 460 PRINT "once installed in certain city, any newly-planned " 470 PRINT "6GHz band terminal station in the same city should be" 480 PRINT "allocated with the same transmitting and receiving " 490 PRINT "point frequencies, in order to facilitate nationwide " 500 PRINT "frequency planning." 510 PRINT "This is defined as frequency coincidence, in which " 520 PRINT "new routes might be enforced to adjust the number of relay hops: for instance, when No. 1 route is composed of 4 relay hops, No. 2 route should then contain an even number of hops." 540 COLOR 6:LOCATE 23,20:PRINT "----- menu: Hit space key -----" 550 COLOR 7:Q$=INKEY$:IF Q$<>" " THEN 550 560 SCREEN 0:CLS:RUN "ME" 1000 ' ******************** 1010 ' * graph draw sub * 1020 ' ******************** 1030 WINDOW SCREEN(0,0)-(116,100) 1040 VIEW(435, 7)-(635,77),,5 1050 LINE(18,20)-(30,80),7,B 1060 LINE(52,20)-(64,80),7,B 1070 LINE(86,20)-(98,80),7,B 1080 LINE( 0,30)-(18,30),7:LINE(15,25)-(18,30),7:LINE(15,35)-(18,30),7 1090 LINE( 0,70)-(18,70),7:LINE( 5,65)-( 0,70),7:LINE( 5,75)-( 0,70),7 1100 LINE(18,30)-(30,70),7:LINE(18,70)-(30,30),7 1110 LINE(30,30)-(52,30),7:LINE(35,25)-(30,30),7:LINE(35,35)-(30,30),7 1120 LINE(30,70)-(52,70),7:LINE(47,65)-(52,70),7:LINE(47,75)-(52,70),7 1130 LINE(52,30)-(64,70),7:LINE(52,70)-(64,30),7 1140 LINE(64,30)-(86,30),7:LINE(81,25)-(86,30),7:LINE(81,35)-(86,30),7 1150 LINE(64,70)-(86,70),7:LINE(69,65)-(64,70),7:LINE(69,75)-(64,70),7 1160 LINE(86,30)-(98,70),7:LINE(86,70)-(98,30),7 1170 LINE(98,30)-(116,30),7:LINE(103,25)-(98,30),7:LINE(103,35)-(98,30),7 1180 LINE(98,70)-(116,70),7:LINE(111,65)-(116,70),7:LINE(111,75)-(116,70),7 1190 LOCATE 2,56:PRINT "f1":LOCATE 2,64:PRINT "f1":LOCATE 2,70:PRINT "f1": LOCATE 2,78:PRINT "f1" 1200 LOCATE 5,57:PRINT "f2":LOCATE 5,63:PRINT "f2":LOCATE 5,71:PRINT "f2": LOCATE 5,77:PRINT "f2" 1210 RETURN 2000 ' ******************** 2010 ' * graph draw sub * 2020 ' ******************** 2030 WINDOW SCREEN(0,0)-(100,100) 2040 VIEW(435,84)-(635,224),,5 2050 CIRCLE( 5,45),3,4:PAINT( 4,45),4,4 2060 CIRCLE(20,25),2,7:PAINT(20,25),7,7 2070 CIRCLE(50,25),2,7:PAINT(50,25),7,7 2080 CIRCLE(77,15),2,7:PAINT(77,15),7,7 2090 CIRCLE(95,54),3,4:PAINT(95,54),4,4 2100 LINE( 5,45)-(20,25),2 2110 LINE(20,25)-(50,25),2 2120 LINE(50,25)-(77,15),2 2130 LINE(77,15)-(95,54),2 2140 ' 2150 CIRCLE(11,75),2,7:PAINT(11,75),7,7 2160 CIRCLE(32,75),2,7:PAINT(32,75),7,7 2170 CIRCLE(50,85),2,7:PAINT(50,85),7,7 2180 CIRCLE(65,70),2,7:PAINT(65,70),7,7 2190 CIRCLE(80,77),2,7:PAINT(80,77),7,7 2200 LINE( 5,45)-(11,75),9 2210 LINE(11,75)-(32,75),9 2220 LINE(32,75)-(50,85),9 2230 LINE(50,85)-(65,70),9 2240 LINE(65,70)-(80,77),9 2250 LINE(80,77)-(95,54),9 2260 COLOR 2:LOCATE 7,57:PRINT "No.1 route (existing)": COLOR 9:LOCATE 16,57:PRINT "No.2 route (new)" 2270 COLOR 7:RETURN