1 00:00:02,430 --> 00:00:09,780 So in this video, we're going to discuss radio frequency spectrum, which is a part of electromagnetic 2 00:00:09,780 --> 00:00:16,230 spectrum starting from three kilohertz and ending at three hundred gigahertz. 3 00:00:16,680 --> 00:00:25,230 So all the wireless things which you see or hear life between three kilohertz and ending at three hundred 4 00:00:25,230 --> 00:00:26,010 gigahertz. 5 00:00:26,400 --> 00:00:34,740 So this spectrum is divided into further bands, starting from very low frequency, which is VLF. 6 00:00:35,100 --> 00:00:39,060 Then there is a EMF ETF and so on. 7 00:00:39,540 --> 00:00:46,440 So this is a radio frequency spectrum, and you can see almost all the things starting from submarines 8 00:00:47,190 --> 00:00:53,100 to radio stations, satellite telephones, wi fi lies between this spectrum. 9 00:00:54,360 --> 00:00:58,350 So we are going to discuss a little bit about this spectrum. 10 00:00:58,950 --> 00:01:06,540 So over here you can see all the different frequencies and abbreviations and frequency and wavelength. 11 00:01:06,930 --> 00:01:16,350 So very low frequency is abbreviated by VLF and its frequency is three kilohertz and ending at 30 kilohertz, 12 00:01:16,830 --> 00:01:23,760 and its wavelength is starting from 100 kilometers and ending at 10 kilometers. 13 00:01:24,510 --> 00:01:26,850 So this is VLF. 14 00:01:26,850 --> 00:01:33,360 Then there is a level which is low frequency, starting from 30 kilohertz and ending at three hundred 15 00:01:33,360 --> 00:01:39,990 kilohertz, and its wavelength is starting from 10 kilometers and ending at one kilometer. 16 00:01:40,290 --> 00:01:45,300 So for those who don't know about wavelength, let's just discuss the wavelength as well. 17 00:01:46,980 --> 00:01:48,270 So what is wavelength? 18 00:01:48,780 --> 00:01:53,790 Wavelength is a distance between two peaks or two drops, right? 19 00:01:54,090 --> 00:02:02,580 So already here you can see this peak is starting from here or here from the Red Line and ending at 20 00:02:03,780 --> 00:02:05,010 this peak over here. 21 00:02:05,430 --> 00:02:13,980 So starting from here and going down and again, coming at the top peak is up one wavelength. 22 00:02:14,490 --> 00:02:22,080 Similarly, if we see from the trough, start from this trough and and or this drop. 23 00:02:22,230 --> 00:02:24,060 So this is a one wavelength. 24 00:02:24,540 --> 00:02:26,070 So this is a wavelength. 25 00:02:27,520 --> 00:02:36,190 And over here, you can see when the frequency is increasing like an EMF, it's 300 close hertz and 26 00:02:36,190 --> 00:02:37,690 ending a 30 megahertz. 27 00:02:38,110 --> 00:02:45,880 The wavelength is decreasing in low frequency, the wavelength is high or the long wavelength. 28 00:02:45,880 --> 00:02:51,290 What here you can see, I should say it's a long wavelength from one hundred kilometers to 10 kilometers, 29 00:02:51,310 --> 00:02:52,540 a long wavelength. 30 00:02:53,020 --> 00:02:59,860 And if you go at the dome where we get the frequencies increasing like very high frequency and I drive 31 00:02:59,860 --> 00:03:03,500 frequency, the wavelength is getting smaller and smaller, right? 32 00:03:04,570 --> 00:03:07,780 So this is one point which I want to clarify. 33 00:03:08,470 --> 00:03:11,560 And let's just discuss what things lie between these. 34 00:03:12,880 --> 00:03:21,840 Frequencies, so starting from very low frequency, so very low frequencies are used by submarines. 35 00:03:22,030 --> 00:03:26,770 Radio stations to synchronize the clock between two remote locations. 36 00:03:27,280 --> 00:03:34,450 Then there is low frequency, which is alive and it's suitable for long distance communication and it 37 00:03:34,450 --> 00:03:36,700 uses it in broadcasting. 38 00:03:36,970 --> 00:03:44,120 So as I told you before, over here you can see the wavelength is larger. 39 00:03:44,140 --> 00:03:47,140 What here you can see in the wavelength is long. 40 00:03:47,350 --> 00:03:53,830 So that flight used in long distance communication, then there is medium frequency, which is known 41 00:03:53,830 --> 00:04:01,150 as EMF and EMF is a most popular frequency band since the beginning of wireless radio transmission. 42 00:04:01,540 --> 00:04:06,430 And it uses a medium wave broadcasting and immature radio. 43 00:04:06,970 --> 00:04:14,560 Then there is each of which is high frequency, and it's also known as short wavelength or shortwave 44 00:04:14,560 --> 00:04:15,370 broadcasting. 45 00:04:15,550 --> 00:04:19,480 And it's also used in a mature radio and flight communications. 46 00:04:21,380 --> 00:04:28,790 Then there is VHF or very high frequency, very high frequency is used in analogue TV broadcasting, 47 00:04:28,970 --> 00:04:36,230 and it's also used in AM radio broadcasting, starting from 88 megahertz to one of eight megahertz. 48 00:04:38,460 --> 00:04:46,860 Then there is a high frequency, which is UHF, so UHF or ultra high frequency is used in keeps navigation 49 00:04:46,860 --> 00:04:52,410 systems, satellite pagers, Wi-Fi, Bluetooth and television broadcasting. 50 00:04:53,160 --> 00:05:00,000 Then there is, said Jeff, or super high frequency, super high frequency upgrades in line of sight. 51 00:05:00,330 --> 00:05:05,040 That means there should be no obstruction between the transmitter and the receiver. 52 00:05:05,430 --> 00:05:07,170 Otherwise, the communication will break. 53 00:05:07,590 --> 00:05:16,260 So it's also known as point to point communications system, and it uses in satellite digital TV broadcasting 54 00:05:16,560 --> 00:05:18,680 via five four five gigahertz channels. 55 00:05:19,200 --> 00:05:23,220 So this is a use of such RF, which is super high frequency. 56 00:05:23,790 --> 00:05:31,020 Then there is extremely high frequency, which is known as Egypt, and Egypt also uses line of sight. 57 00:05:31,440 --> 00:05:37,470 And that means it also operates on point to point communication and it uses in 5G technology. 58 00:05:38,460 --> 00:05:42,150 So these are all the frequency ranges and our future videos. 59 00:05:42,150 --> 00:05:49,320 We are going to see different things operate on these frequencies, and we will see how to transmit 60 00:05:49,320 --> 00:05:55,200 data and receive data from different things which operate into these frequency ranges. 61 00:05:55,920 --> 00:05:56,370 Thank you.