{"id":4276,"date":"2021-12-29T21:00:30","date_gmt":"2021-12-29T12:00:30","guid":{"rendered":"https:\/\/www.skyer9.pe.kr\/wordpress\/?p=4276"},"modified":"2023-09-21T15:49:48","modified_gmt":"2023-09-21T06:49:48","slug":"rfradio-frequency-%ec%9a%a9%ec%96%b4%ec%a0%95%eb%a6%ac","status":"publish","type":"post","link":"https:\/\/www.skyer9.pe.kr\/wordpress\/?p=4276","title":{"rendered":"RF(Radio Frequency) \uc6a9\uc5b4\uc815\ub9ac"},"content":{"rendered":"

RF(Radio Frequency) \uc6a9\uc5b4\uc815\ub9ac<\/h1>\n

RF \uae30\ucd08\uac15\uc758\uc2e4<\/a> : \uc544\uc8fc \uc88b\ub2e4.<\/p>\n

\ucc38\uc870<\/a><\/p>\n

\ubcc0\uc870\ubc29\uc2dd<\/a><\/p>\n

\uc8fc\ud30c\uc218\ub300\uc5ed<\/a><\/p>\n

\uae30\ucd08\uc6a9\uc5b4<\/h2>\n

RF(Radio Frequency)<\/h3>\n

Radio \ub294 \uacf5\uc911\ud30c \ub77c\ub514\uc624\ub97c \uc758\ubbf8\ud558\ub294 \uac83\uc774 \uc544\ub2c8\ub77c,
\nwireless \ub97c \uc758\ubbf8\ud569\ub2c8\ub2e4.<\/p>\n

\uc8fd, \ud569\uccd0\uc11c \ubb34\uc120 \uc8fc\ud30c\uc218\ub97c \uc758\ubbf8\ud569\ub2c8\ub2e4.<\/p>\n

SDR(Software-Defined Radio)<\/h3>\n

\uc77c\ubc18\uc801\uc778 RF \uc7a5\ube44\ub294 \ud2b9\uc815 \uae30\ub2a5(\ubb34\uc804\uae30 \ub610\ub294 \ub77c\ub514\uc624 \ub4f1\ub4f1)\uc73c\ub85c\ub9cc \uc791\ub3d9\ud569\ub2c8\ub2e4.<\/p>\n

\uc774\uc640 \ubc18\ub300\ub85c, SDR \uc740 \ud558\ub4dc\uc6e8\uc5b4\uac00 \uc544\ub2cc \uc18c\ud504\ud2b8\uc6e8\uc5b4\ub97c \uc774\uc6a9\ud574 RF \ub97c \uad6c\ud604\ud569\ub2c8\ub2e4.
\nCPU \ub97c \uc774\uc6a9\ud574 \ud558\ub4dc\uc6e8\uc5b4\uac00 \ud558\ub358 \uae30\ub2a5\ub4e4\uc744 \ud504\ub85c\uadf8\ub7a8\uc73c\ub85c \uad6c\ud604\ud558\uae30\uc5d0,
\n\uc6d0\ud558\ub294 \uae30\ub2a5\uc758 \uc7a5\ube44\ub97c \ud504\ub85c\uadf8\ub798\ubc0d\ub9cc\uc73c\ub85c \ub9cc\ub4e4\uc5b4 \ub0bc \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

\ub610, \ud558\ub4dc\uc6e8\uc5b4 \uad50\uccb4\uc5c6\uc774 \uc18c\ud504\ud2b8\uc6e8\uc5b4 \uc5c5\uadf8\ub798\uc774\ub4dc\ub9cc\uc73c\ub85c \uae30\ub2a5\uc744 \uc218\uc815\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

\ubc18\uc1a1\ud30c(Carrier)<\/h3>\n

\uc5ec\uae30\uc11c \ubc18<\/code> \uc740 \ubc18\ub300 \ubc18\uc0ac\ub97c \uc758\ubbf8\ud558\ub294 \uac83\uc774 \uc544\ub2c8\ub77c,
\n\uc6b4\ubc18\uc744 \uc758\ubbf8\ud569\ub2c8\ub2e4.<\/p>\n

\uc74c\uc131\uc758 \uacbd\uc6b0 \uc218Khz, \uc601\uc0c1\uc774\ub098 \ub370\uc774\ud130\uc758 \uacbd\uc6b0 \uc218Mhz \uc815\ub3c4\uc758 \uc8fc\ud30c\uc218\ub85c,
\n\uc804\ud30c\ub97c \uba40\ub9ac \uc804\uc1a1\ud560 \uc218 \uc5c6\uc2b5\ub2c8\ub2e4.<\/p>\n

\uc774\ub7f0 \uc804\ud30c\ub97c \uace0\uc8fc\ud30c\uc218\uc5d0 \uc62c\ub824\uc11c \uc6b4\ubc18\ud558\uba74 \uba3c \uac70\ub9ac\uc5d0 \uc804\uc1a1\uc774 \uac00\ub2a5\ud558\uace0,
\n\uc774\ub7f0 \ubc29\uc2dd\uc758 \uc804\ud30c\ub97c \ubc18\uc1a1\ud30c\ub77c\uace0 \ud569\ub2c8\ub2e4.<\/p>\n

\ubcc0\uc870(Modulation)<\/h3>\n

\uc6d0\ubcf8 \uc2e0\ud638\ub97c \ubc18\uc1a1\ud30c\ub85c \ubcc0\ud658\ud558\ub294 \uac83.<\/p>\n

\ubcf5\uc870(Demodulation)<\/h3>\n

\ubcc0\uc870\ub41c \uc2e0\ud638\ub97c \uc6d0\ubcf8 \uc2e0\ud638\ub85c \ubcf5\uc6d0\uc2dc\ud0a4\ub294 \uac83.
\n\ubcc0\uc870\ubc29\uc2dd \uadf8\ub300\ub85c \uc5ed\uc73c\ub85c \ubcf5\uc6d0\ud569\ub2c8\ub2e4.<\/p>\n

\ub370\uc2dc\ubca8(dB)<\/h3>\n

\ucc38\uc870<\/a><\/p>\n

\uc608\ub97c \ub4e4\uc5b4, \uc804\ud30c\ub97c \uc99d\ud3ed\uc2dc\ucf1c\uc57c \ud55c\ub2e4\uace0 \ud560 \ub54c,
\n2\ubc30 3\ubc30 \uc99d\ud3ed\uc2dc\ud0a4\ub294\uac8c \uc544\ub2c8\ub77c,
\n100\ubc30 1000\ubc30 10000\ubc30 \uc99d\ud3ed\uc2dc\ud0a4\ub294 \uacbd\uc6b0\uac00 \ub9ce\uc2b5\ub2c8\ub2e4.<\/p>\n

\uc774\ub807\uac8c \uc22b\uc790\uac00 \ucee4\uc9c0\ub294 \uac83\uc744 \ub9c9\uae30 \uc704\ud574,
\n\uc544\ub798\ucc98\ub7fc \uce21\uc815\uce58(\uc804\ub958 \uc804\uc555 \ub4f1)\uc5d0 log \ub97c \uc801\uc6a9\ud558\uac8c \ub429\ub2c8\ub2e4.<\/p>\n

10 *<\/code> log 10 = 10 dB
\n10 *<\/code> log 100 = 20 dB
\n10 *<\/code> log 1000 = 30 dB
\n10 *<\/code> log 10000 = 40 dB<\/p>\n

\uc989, 20 dB \uc99d\ud3ed\uc774\ub77c\uba74 100\ubc30\ub97c \uc99d\ud3ed\ud588\ub2e4\ub294 \uc758\ubbf8\uac00 \ub429\ub2c8\ub2e4.<\/p>\n

10 \uc744 \uacf1\ud558\ub294 \uac74 \ubb58\uae4c\uc694?
\n150\ubc30 \uc99d\ud3ed\ud55c\ub2e4\ub77c\uace0 \ud558\uba74 \uc18c\uc218\uc810\uc774 \ub098\uc624\uac8c \ub429\ub2c8\ub2e4.
\n\uc18c\uc218\uc810 \ub098\uc624\ub294\uac78 \uc904\uc774\uae30 \uc704\ud574 10 \uc744 \uacf1\ud574\uc90d\ub2c8\ub2e4.<\/p>\n

\uc774\ub4dd(gain)<\/h3>\n

\ucc38\uc870<\/a><\/p>\n

\uc774\ub4dd(gain) \uc774\ub780 \uc785\ub825\uc2e0\ud638\ub97c \uba87\ubc30\ub85c \uc99d\ud3ed\uc2dc\ud0a4\ub0d0\ub97c \uc758\ubbf8\ud569\ub2c8\ub2e4.
\n\uc2e0\ud638\uac00 100\ubc30 \uc99d\ud3ed\ub418\uba74 Gain \uc740 20dB \uc774 \ub429\ub2c8\ub2e4.<\/p>\n

RF(Radio Frequency) \/ IF(Intermediate Frequency) \/ BB(Base Band)<\/h3>\n

\ucc38\uc870<\/a><\/p>\n

BB \uc6d0\ubcf8 \uc2e0\ud638(\uc74c\uc131, \uc601\uc0c1, \ub370\uc774\ud0c0) \uc790\uccb4\ub97c \ub9d0\ud569\ub2c8\ub2e4.
\nRF \ub294 \uc790\uc720\uacf5\uac04(\uacf5\uae30\uc911 \ub610\ub294 \uc6b0\uc8fc\uacf5\uac04)\uc744 \uc9c0\ub098\ub2e4\ub2c8\ub294 \uc8fc\ud30c\uc218 \uc2e0\ud638\ub97c \ub9d0\ud569\ub2c8\ub2e4.<\/p>\n

IF(\uc911\uac04 \uc8fc\ud30c\uc218) \ub294 BB \uc5d0\uc11c RF \ub85c \ubcc0\ud658\ub420 \ub54c(\ub610\ub294 RF -> BB),
\n\uc911\uac04\uc5d0 \uac70\uccd0\uac00\ub294 \uc8fc\ud30c\uc218\uc785\ub2c8\ub2e4.<\/p>\n

\ucc38\uc870\uc5d0 \uc65c \uc911\uac04 \uc8fc\ud30c\uc218\uac00 \ud544\uc694\ud55c\uac00\uc5d0 \ub300\ud574 \ub9ce\uc774 \uc124\uba85\ud558\uace0 \uc788\uc9c0\ub9cc…
\n\uc5ec\uae30\uc11c\ub294 \uadf8\ub0e5 \uac04\ub2e8\ud788 \uc911\uac04\ub2e8\uacc4 \ub450\ub294\uac8c \uc88b\uc544\uc11c<\/code> \uc815\ub3c4\ub85c \uc815\ub9ac\ud569\ub2c8\ub2e4.<\/p>\n

\uc5ec\ud30c\uae30(Filter)<\/h3>\n

\ucc38\uc870<\/a><\/p>\n

\ud544\ud130\ub77c\ub294 \uc774\ub984 \uadf8\ub300\ub85c \ud2b9\uc815 \uc8fc\ud30c\uc218\ub9cc \uac78\ub7ec\uc11c \ud1b5\uacfc\uc2dc\ud0a4\ub294 \uac83\uc785\ub2c8\ub2e4.<\/p>\n

LPF(Low Pass Filter)<\/h4>\n

\uace0\uc8fc\ud30c \uc7a1\uc2e0\ud638\ub97c \uc81c\uac70\ud558\uace0 \ub098\uba38\uc9c0\ub97c \ud1b5\uacfc\uc2dc\ud0a4\ub294 \ud544\ud130\uc785\ub2c8\ub2e4.
\n\uac00\uc7a5 \uae30\ubcf8\uc801\uc778 \ud544\ud130\uc774\uae30\ub3c4 \ud569\ub2c8\ub2e4.<\/p>\n

\ub2e4\uc6b4\uc0d8\ud50c\ub9c1(Downsampling, Decimation)<\/h5>\n

sample rate \ub97c \uc904\uc785\ub2c8\ub2e4.<\/p>\n

\ucc28\ub2e8\uc8fc\ud30c\uc218(Cut off frequency)<\/h5>\n

\uc81c\uac70\ub418\ub294 \uace0\uc8fc\ud30c \uc7a1\uc2e0\ud638\uc758 \ubc94\uc704\ub97c \uc9c0\uc815\ud569\ub2c8\ub2e4.<\/p>\n

BPF(Band Pass Filter)<\/h4>\n

\uc6d0\ud558\ub294 \uc8fc\ud30c\uc218\ub300\uc5ed\ub9cc \uace8\ub77c\uc11c \ud1b5\uacfc\uc2dc\ud0a4\ub294 \ud544\ud130\uc785\ub2c8\ub2e4.
\n\uac00\uc7a5 \ub9ce\uc774 \uc4f0\uc774\uc9c0\ub9cc \ub610 \ub9cc\ub4e4\uae30\ub3c4 \uc5b4\ub835\uc2b5\ub2c8\ub2e4.<\/p>\n

HPF(High Pass Filter)<\/h4>\n

\uace0\uc8fc\ud30c\ub9cc \ud1b5\uacfc\uc2dc\ud0a4\ub294 \ud544\ud130\uc785\ub2c8\ub2e4.
\n\ud2b9\uc218\ud55c \uacbd\uc6b0\uc5d0\ub9cc \uc0ac\uc6a9\ub429\ub2c8\ub2e4.<\/p>\n

\uc0d8\ud50c\ub9c1(sampling)<\/h3>\n

\uc2e0\ud638\ucc98\ub9ac\uc5d0\uc11c \uc0d8\ud50c\ub9c1\uc740 \uc544\ub0a0\ub85c\uadf8 \ub370\uc774\ud130\ub97c \ub514\uc9c0\ud138 \ub370\uc774\ud130\ub85c \ucd94\ucd9c\ud558\ub294 \uac83\uc744 \uc758\ubbf8\ud569\ub2c8\ub2e4.<\/p>\n

\uc0d8\ud50c\ub9c1 \ub808\uc774\ud2b8(sampling rate)<\/h3>\n

\uc5f0\uc18d\uc801 \uc2e0\ud638\uc5d0\uc11c \uc5bb\uc5b4\uc9c4 \ub2e8\uc704\uc2dc\uac04(\uc8fc\ub85c \ucd08)\ub2f9 \uc0d8\ud50c\ub9c1 \ud69f\uc218\ub97c \ub9d0\ud569\ub2c8\ub2e4.
\n\ub2e8\uc704\ub294 \ud5e4\ub974\uce20(Hz) \uc785\ub2c8\ub2e4.<\/p>\n

\uc608\ub97c\ub4e4\uc5b4, \uc624\ub514\uc624 \ud45c\uc900 sampling rate \ub294 44.1khz \uc778\ub370,
\n\uc774 \ub9d0\uc740 \uace7 1sec \ub2f9 44100\ubc88\uc758 samples \uc744 \uae30\ub85d\ud588\ub2e4\uace0 \ubcfc\uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

\ub098\uc774\ud034\uc2a4\ud2b8 \uc774\ub860(Nyquist Theorem) \uc5d0 \uc758\ud558\uba74,<\/p>\n

\n

\uc5b4\ub5a4 \uc624\ub514\uc624 \ud30c\ud615\uc774\ub4e0 peak(+) to peak (-) \ub97c \ud45c\ud604\ud558\ub294 2\uac1c\uc758 \uac12\ub9cc \uc788\ub2e4\uba74 \ud45c\ud604 \uac00\ub2a5\ud558\ub2e4.<\/p>\n<\/blockquote>\n

\uc989, \uce21\uc815\ud558\ub824\ub294 \uc8fc\ud30c\uc218\uc758 \ub450\ubc30 \uc774\uc0c1\uc5d0 \ud574\ub2f9\ud558\ub294 sampling rate \ub85c,
\n\uae30\ub85d\uc744 \ud574\uc57c \uc2e0\ud638\ub97c \ubcf5\uc6d0\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

\uc774\uc0b0\ud654(discretization)<\/h3>\n

\uc0d8\ud50c\ub9c1\uc5d0 \uc758\ud574 \uc218\uce58\ud654\ud55c \ub370\uc774\ud0c0\ub97c \uc774\uc0b0\ud654 \ub370\uc774\ud0c0\ub77c\uace0 \ud569\ub2c8\ub2e4.<\/p>\n

DFT (discrete Fourier transform, \uc774\uc0b0 \ud478\ub9ac\uc5d0 \ubcc0\ud658)<\/h3>\n

DFT \ub780 \uc774\uc0b0\ud654 \ub370\uc774\ud130\ub97c \ub514\uc9c0\ud138 \uc8fc\ud30c\uc218\ub85c \ubcc0\ud658\ud574\uc8fc\ub294 \uc54c\uace0\ub9ac\uc998\uc785\ub2c8\ub2e4.<\/p>\n

FFT(Fast Fourier transform, \uace0\uc18d \ud478\ub9ac\uc5d0 \ubcc0\ud658)<\/h3>\n

\uc774\uc0b0 \ud478\ub9ac\uc5d0 \ubcc0\ud658\uc744 \ube60\ub974\uac8c \uc2e4\ud589\ud574\uc8fc\ub294 \uc54c\uace0\ub9ac\uc998\uc744 \ub9d0\ud569\ub2c8\ub2e4.
\n\uc77c\ubc18\uc801\uc73c\ub85c \uc0ac\uc6a9\ub418\ub294 FFT \uc54c\uace0\ub9ac\uc998\uc740,
\n\ucfe8\ub9ac-\ud29c\ud0a4 \uc54c\uace0\ub9ac\uc998(Cooley-Tukey algorithm) \uc785\ub2c8\ub2e4.<\/p>\n

\uc804\uc790\uae30\ud30c, \uc804\uc790\ud30c, \uc804\ud30c(Electromagnetic wave)<\/h3>\n

\ubaa8\ub450 \uac19\uc740 \uc758\ubbf8\ub85c,
\n\uc804\uae30\uc7a5\uacfc \uc790\uae30\uc7a5 \ud55c \uc30d\uc774 \ud30c\ub3d9\uc744 \uc774\ub8e8\uba70 \uacf5\uac04 \uc18d\uc73c\ub85c \uc804\ud30c\ub418\ub294 \uac83\uc744 \uc758\ubbf8\ud569\ub2c8\ub2e4.<\/p>\n

\ubcf5\uc18c\uc2e0\ud638(Quadrature signal)<\/h3>\n

Quadrature signal\uc740 \ud2b9\uc815 \uc2dc\uac04\uc5d0\uc11c\uc758 \uac12\uc744 \ud558\ub098\uc758 \ubcf5\uc18c\uc218\ub85c \ud45c\ud604\ud560 \uc218 \uc788\ub294 2\ucc28\uc6d0 \uc2e0\ud638<\/code>\ub77c\uace0 \uc218\ud559\uc801 \uc73c\ub85c \uc815\uc758\ud569\ub2c8\ub2e4.<\/p>\n

\uc804\uc790\uae30\ud30c\ub294 \uc804\uae30\uc7a5\uacfc \uc790\uae30\uc7a5\uc774 \uacf5\uc874\ud558\ub294\ub370,
\n\uc774\ub97c \ud558\ub098\uc758 \uac12\uc73c\ub85c \ucc98\ub9ac\ud558\uae30 \uc704\ud574 \ub4f1\uc7a5\ud558\ub294 \uac83\uc774 \ubcf5\uc18c\uc218\uc785\ub2c8\ub2e4.<\/p>\n

\ubcf5\uc18c\uc218\ub294 \uc2e4\uc218\ubd80 (real part) \uc640 \ud5c8\uc218\ubd80 (imaginary part) \uc758 2\uac1c\ub85c \ub098\ub258\uc5b4\uc9d1\ub2c8\ub2e4.
\nquadrature signal \uc5d0\uc11c \uc2e4\uc218\ubd80(real part) \ub97c in-phase \ub77c \ud558\uace0,
\n\ud5c8\uc218\ubd80(imaginary part) \ub97c quadrature-phase \ub77c \ud569\ub2c8\ub2e4.
\n\uc774 \ub2e8\uc5b4\uc758 \uc55e \uae00\uc790\ub97c \ub530\uc11c \uac01\uac01 I, Q \ub77c \ud569\ub2c8\ub2e4.<\/p>\n

\ubcf5\uc18c\uc218 \uccb4\uacc4\ub97c \uae30\ubc18\uc73c\ub85c \ud558\uae30\uc5d0 complex signal \uc774\ub77c\uace0\ub3c4 \ubd88\ub9ac\uba70,
\nI \uc640 Q 2\uac1c\ub85c \uc774\ub8e8\uc5b4\uc838 \uc788\uc73c\ubbc0\ub85c I\/Q \uc2e0\ud638\ub77c\uace0\ub3c4 \uc790\uc8fc \ubd88\ub9bd\ub2c8\ub2e4.
\nQuadrature signal \uc774 \uc0ac\uc6a9\ub418\ub294 \uc2e0\ud638\ucc98\ub9ac\ub97c quadrature processing\uc774\ub77c\uace0 \ud569\ub2c8\ub2e4.<\/p>\n

spurious<\/h3>\n

\uc6d0\uc8fc\ud30c\uc218\uc5d0 \ub530\ub77c\uc624\ub294 \uc7a1\uc8fc\ud30c\uc218.<\/p>\n

harmonic, subharmonic, sampling spurious, random spurious \uac00 \uc788\ub2e4.<\/p>\n

dBc<\/h3>\n

\uc6d0\uc8fc\ud30c\uc218 \ub300\ube44 spurious \uac00 \uc5bc\ub9c8\ub098 \uc57d\ud55c dBm \uc778\uc9c0\ub97c \ub098\ud0c0\ub0b4\ub294 \ub2e8\uc704.<\/p>\n

\uc6d0\uc8fc\ud30c\uc218\uac00 -20 dBm \uc774\uace0, spurious \uac00 -60dBm \uc774\uba74 -40 dBc \ub77c\uace0 \ud55c\ub2e4.<\/p>\n

LNA<\/h3>\n

Low Noise Amplifier \uc800\uc7a1\uc74c \uc99d\ud3ed\uae30
\n\uc7a1\uc74c\uc758 \uc99d\ud3ed\uc744 \ucd5c\uc18c\ud654\ud55c \uc99d\ud3ed\uae30.<\/p>\n

VGA<\/h3>\n

Variable Gain Amplifier \ucd9c\ub825 \uc99d\ud3ed\uae30
\n\ucd9c\ub825\uc744 \uc99d\ud3ed\ud55c\ub2e4. \uc7a1\uc74c\ub3c4 \ud3ec\ud568\ud574\uc11c \ubaa8\ub450 \uc99d\ud3ed\ud55c\ub2e4.<\/p>\n

\ubcc0\uc870\ubc29\uc2dd<\/h2>\n

AM(Amplitude Modulation, \uc99d\ud3ed \ubcc0\uc870)<\/h3>\n

\uc2e0\ud638\ub97c \ubc18\uc1a1\ud30c \ub300\uc5ed\uc73c\ub85c \uc99d\ud3ed\ud574\uc11c \uc804\uc1a1\ud558\ub294 \ubc29\uc2dd.
\n\uad6c\ud604\uc774 \uac04\ub2e8\ud558\uc9c0\ub9cc \uc7a1\uc74c\uc5d0 \ucde8\uc57d\ud569\ub2c8\ub2e4.<\/p>\n

SSB(Single Side Band transmission)<\/h4>\n

\ub2e8\uce21\ud30c\ub300 \uc804\uc1a1.<\/p>\n

FM(Frequency Modulation, \uc8fc\ud30c\uc218 \ubcc0\uc870)<\/h3>\n

\uad6c\ud604\uc774 \ubcf5\uc7a1\ud558\uc9c0\ub9cc, \uc7a1\uc74c\uc5d0 \uac15\ud569\ub2c8\ub2e4.<\/p>\n

\uc704\uc0c1\ubcc0\uc870(Phase Modulation)<\/h3>\n

\ubc18\uc1a1\ud30c\uc758 \uc704\uc0c1\uc744 \ubcc0\uacbd\ud558\ub294 \ubcc0\uc870 \ubc29\uc2dd.<\/p>\n

\uc8fc\ud30c\uc218 \ub300\uc5ed<\/h2>\n

AC(Audio Frequency)<\/h3>\n

\uc74c\uc131 \uc8fc\ud30c\uc218\ub300\uc5ed, 0~150khz \ub300\uc5ed\uc744 \ub9d0\ud569\ub2c8\ub2e4.<\/p>\n

UHF(Ultra High Frequency)<\/h3>\n

\uc8fc\ud30c\uc218\uac00 300MHz \uc5d0\uc11c 3.0GHz \uc0ac\uc774\uc5d0 \ud560\ub2f9\ub41c \uc804\uc790\uae30\ud30c\ub97c \ub9d0\ud569\ub2c8\ub2e4.<\/p>\n

CB (Citizen Band)<\/h3>\n

\uc81c 1\ud615 \uc0dd\ud65c\ubb34\uc120\uad6d\uc774\ub77c \ubd88\ub9ac\uba70,
\n\ud5c8\uac00\ub098 \uc2e0\uace0 \ub610\ub294 \uc804\ud30c\uc0ac\uc6a9\ub8cc \uc5c6\uc774 \ub204\uad6c\ub098 \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 \ub300\uc5ed\uc744 \ub9d0\ud569\ub2c8\ub2e4.
\n27MHz \ub300\uc5ed\uc5d0\uc11c 40\uac1c\uc758 \ucc44\ub110\uc744 \uc774\uc6a9\ud560 \uc218 \uc788\uc2b5\ub2c8\ub2e4.<\/p>\n

FRS (Familly Radio Service)<\/h3>\n

\uc81c2\ud615 \uc0dd\ud65c \ubb34\uc120\uad6d\uc73c\ub85c\uc11c, \ud5c8\uac00\ub098 \uc2e0\uace0 \uc5c6\uc774 UHF \ub300\uc5ed \uc804\ud30c\ub97c \uc774\uc6a9\ud558\uc5ec \uac1c\uc778\uc774 \uc27d\uac8c \uc0ac\uc6a9\ud560 \uc218 \uc788\ub294 \uc0dd\ud65c\uc6a9 \ubb34\uc804\uae30\ub97c \ub9d0\ud569\ub2c8\ub2e4<\/p>\n

LMR (Land Mobile Radio ; \uc0b0\uc5c5\uc6a9 \ubb34\uc804\uae30\/\ubb34\uc120\uad6d)<\/h3>\n

\ucd9c\ub825\uc774 \ud06c\uae30 \ub54c\ubb38\uc5d0 \uc77c\ubc18 FRS\ub098 GMRS\uc5d0 \ube44\ud574 \uc1a1\uc218\uc2e0 \uac70\ub9ac\uac00 \uae38\ub2e4. \uc8fc\ud30c\uc218\ub294 146\/222\/444 MHz\ub300\uc5d0\uc11c \ucd5c\ub300 128\ucc44\ub110\uc744 \uc0ac\uc6a9\ud558\uba70, \ubd84\uae30\ub2f9 \uc8fc\ud30c\uc218 \uc0ac\uc6a9\ub8cc\ub3c4 \ub0b4\uac8c \ub41c\ub2e4.<\/p>\n","protected":false},"excerpt":{"rendered":"

RF(Radio Frequency) \uc6a9\uc5b4\uc815\ub9ac RF \uae30\ucd08\uac15\uc758\uc2e4 : \uc544\uc8fc \uc88b\ub2e4. \ucc38\uc870 \ubcc0\uc870\ubc29\uc2dd \uc8fc\ud30c\uc218\ub300\uc5ed \uae30\ucd08\uc6a9\uc5b4 RF(Radio Frequency) Radio \ub294 \uacf5\uc911\ud30c \ub77c\ub514\uc624\ub97c \uc758\ubbf8\ud558\ub294 \uac83\uc774 \uc544\ub2c8\ub77c, wireless \ub97c \uc758\ubbf8\ud569\ub2c8\ub2e4. \uc8fd, \ud569\uccd0\uc11c \ubb34\uc120 \uc8fc\ud30c\uc218\ub97c \uc758\ubbf8\ud569\ub2c8\ub2e4. SDR(Software-Defined Radio) \uc77c\ubc18\uc801\uc778 RF \uc7a5\ube44\ub294 \ud2b9\uc815 \uae30\ub2a5(\ubb34\uc804\uae30 \ub610\ub294 \ub77c\ub514\uc624 \ub4f1\ub4f1)\uc73c\ub85c\ub9cc \uc791\ub3d9\ud569\ub2c8\ub2e4. \uc774\uc640 \ubc18\ub300\ub85c, SDR \uc740 \ud558\ub4dc\uc6e8\uc5b4\uac00 \uc544\ub2cc \uc18c\ud504\ud2b8\uc6e8\uc5b4\ub97c \uc774\uc6a9\ud574 RF \ub97c \uad6c\ud604\ud569\ub2c8\ub2e4. CPU \ub97c \uc774\uc6a9\ud574 \ud558\ub4dc\uc6e8\uc5b4\uac00\u2026 Read More »<\/a><\/span><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[],"class_list":["post-4276","post","type-post","status-publish","format-standard","hentry","category-rf-sdr"],"_links":{"self":[{"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4276","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4276"}],"version-history":[{"count":38,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4276\/revisions"}],"predecessor-version":[{"id":7995,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=\/wp\/v2\/posts\/4276\/revisions\/7995"}],"wp:attachment":[{"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4276"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4276"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.skyer9.pe.kr\/wordpress\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4276"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}