无线电委员会的1200道考题.txt

棬12002004 1 1.1 1 1.2 14 1.3 43 1.4 55 59 2.1 59 2.2 62 2.3 69 72 3.1 72 3.2 75 3.3 78 3.4 79 80 4.1 80 4.2 86 4.3 99 塢 106 -1 1.1 1 1864_ 2 1887 3 4 v/ma/mw/m2 5 6 粨 7 粨vhf 30mhz 300mhz 8 cdma825-835mhz 870-880mhz 9 is-95cdma 1.23mhz 10 phs1900-1915mhz 11 17851805mhzscdma 12 108-137mhz絼 108117.975mhz 117.975137mhz 13 2.4ghz5.8ghz 14 f1f1f2以f2 f2+2ff=f2- f1 63 64 400mhz书 0.5w 5 65 66 , 67 68 gsm gmsk 69 70 71 72 粨 沨 73 74 75 wcdmacdma2000fddtd-scdma tdd 76 77 z0=e/h 迹 z0=120377 78 , 79 80 l2 81 82 83 84 85 86 87 rf 88 (fdm) 89 (gmsk)fsk壬 90 . 91 92 tdma gsm 93 800mhz25khz 94 仯 95 96 97 98 tstutstu/tsfgfufgfu/fg 99 gps24 100 101 fmfc fc+fmfc-fmm=1fc+fm-102 103 16db 104 105 粨 106 1db1.261.12 107 150mhz10.7mhz 108 3g 3th generation ,gsmglobal system for mobile communications 109 eglieglip p=40lgd c 20lg(hthr) + 20lgf + 88.1hthr 110 汱 111 112 113 114 115 , c=blog2(1+s/n) 116 v/m糡eh = e/377 117 迹迹 118 16k0g3e16 k016.0khzg3e 绰 119 99%x-db 120 121 122 粨/ 123 124 _ 125 _ 126 2 khz_4_khz 127 _ 128 棬0-fmfs_ fs2fm_ 129 任_ 130 糣_1_ 131 粨_ _ 132 7m25c3f_7.25mhz _ 133 _ 134 5db4 -7 db 135 1000dbc 70 db 136 任_仯 137 _ 138 _ 139 _ 140 _棬askfsk 141 2psk01_180_ 142 psk_s/n_ 143 itu-r sm.182-4飬_ 144 _ 145 豸_ 146 _ 147 10.7mhz200mhz148 10.7mhz100mhz_121.4_mhz 149 _ 150 _ 151 粨 152 153 154 155 itur sm.378涨30mhz2 db30mhz2700mhz3 db 156 涨“ 1 _8h_6min _sar_0.1w/kg _ 2 _24h _6min _sar_0.02w/kg _ 157 _36000_24_1/3_ 158 vhf/uhf26 dbv/m 159 vhf/uhf 17 db 15 db 160 ch16绰 156.8 mhz 161 162 绰书 20 mw 16 khz 163 书 2 5w 书 50w 2000 hz, 书50w 3000 hz 167 涨168 1-5糡 125 dbv/m 169 170 r =3.57( + ) km (h h ) 171 172 173 174 u = 175 3 176 177 178 800mhz cdma_283_878.490 mhz 179 180 洫粨 浼 181 uhf 300 3000 mhz tv 182 183 pim=2pa+py-k k 184 漰 185 186 lmds24.45 27 ghz 1250 mhz 187 10 db 188 118ghz豸189 30 db 190 书 100 w -70 dbc -70 dbc 191 糡eh 192 193 gsm900 45 mhzdcs1800 95 mhz_200_ khz 194 195 196 涨涨 197 108-137mhz 108-117.975 mhz絼 am 1.2 1uhfd a4002000mhz b3002000mhz c4003000mhz d3003000mhz 2impb a b c d 310wdbmd a10dbm b20dbm c30dbm d40dbm 4a 粨 a3000ghz b3000mhz c300mhz d300ghz 530300mhz粨 a a b c d 6dbuvdbmdbmc a b c d 7gsmb afdma btdma ccdma dsdma 8phs a a288khz b200khz c25khz d30khz 9cdma a a1.23mhz b1.5mhz c1.75mhz d1.85mhz 100dbw= cdbm. a0 b3 c30 112.5w50db bw a2.5 b25 c250 12rbwb a b c 13gb1204689涨1.5mhza a1m50 b15m0 c150m 1490%a ac 15书10w10db5db书 b a25dbw b15dbw c5dbw 16 a a b c 17sc c a12ghz4/6ghz b1840ghz8/12ghz c2.5ghz4/6ghz d4.8ghz4/8ghz 18cdmagsma mhz a5 b10 c15 19a aask bfsk cpsk ddam 20abcd a b c d 21shf c a 101 b 101 c 101 22书b a0.1 b0.5 c1 23, b a. b 24, c a.30khz30mhz b30mhz100mhz c100mhz1000mhz 25 a a b c d 26( d ) a5dbi b4.25dbi c3dbi d2.15dbi 27400mhz( b ) a460.5460.6mhz b460.0460.1mhz c460.1460.2mhz d460.2460.3mhz 28 a a b c d 29 c a粨粨 b粨粨 c粨 d 30 a ar bor cr dor 31 d ar bor cr dor 32(a c d) a b c d 3325khz绰(c)(b),(d) a.25khz b3khz c 5khz d16khz 34, 粨a b c d a. bc d 35绮abcd a b c d 36绮ad a b c d 37绮abcd a b c d 38涨(c) a8m6m b5m6m c250m9m 39gb 6364-86絼涨vor(c)db a 20 b272430 c373440 41, gbj 20093-92vhf/uhf涨1kw1kw(b) m a1000600 b2000012000 c100006000 41, gjb 2081-9487-108mhz108-137mhz涨( b )dbv/m a121918 b323938 c424948 42, ( a ) a b c 43phsgsmcdma( a) atdd/tdmafdd/tdmafdd/cdma bfdd/tdmafdd/tdmacdma ctdd/tdmatdd/tdmafdd/cdma 44phs_3g_3gphs_( b) a1900mhz c 1915mhz b1900mhz c 1920mhz c1895mhz c 1918mhz 45 a aw0 = 1/lc1/2 bw0 = 1/lc cw0 = 1/2 lc1/2 dw0 = 1/2 lc 46 b a b c 47豸a b c d 48 a a b c 49fmaxfmin b afmax/ fmin bfmaxfmin/2 cfmax+fmin/2 dfmaxfmin/fmax+fmin 50uwbb a b c d 51itu滮3g d a825835/870-880 mhz b930960 /885-915mhz c17101755/1805-1850mhz d1885-2025/2110-2200 mhz 52prsa a b c dabc 53ab a b c d 54(abc) a b c d 55巴( a ) a b c d 56(b) a b c d 57( c ) a b c d书 58涨 b ab cd 59d a2w103kmb2w104km c2w105kmd2w106km 60( d ) a b c d 61fmmf10%b ab=2fm bb=2mf+1fm cb=2mf+2fm db=2mffm 62cdmais-95( a ) a b c dtdma 63( a b ) a絼 bc d 64( abcd ) a b c d 65( abc ) a b c d 66abcd a b c d 67 abc a b c d 68 ad am+100 % bm+100 % c d 69(abcd) a b c d 70(abcd) a b c d 71(a) av ka k ku bka v k ku c v k ka ku d v ka ku k 72涨lmdsb a1.5ghz b26ghz c15ghz d24ghz 73itu(a) a b c d 74緢bcd a