The relationship between wavelength and frequency and conversion tools

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The relationship between wavelength and frequency and conversion tools [Copy link]

Relationship and conversion between frequency and wavelength
Required Data Entry
Input frequency
Frequency Unit	Select Frequency DesignationHertzKilohertzMegahertzGigahertz
Calculation results
The input frequency is Meter band The actual wavelength is aboutrice
Wavelength = feet
Wavelength = Inches
Wavelength = rice
The input frequency is Meter band The actual wavelength is aboutrice
Wavelength = Millimeters
Input frequency unit is
Frequency = Hz
Frequency = KHz
Frequency = MHz
Frequency = GHz
Meter band	Frequency range and usage
160 meters	1800 - 2000 kHz Amateur Radio
120 meters	2300 - 2498 kHz Broadcasting Stations
90 meters	3200 - 3400 kHz Broadcasting Stations
80 meters	3500 - 4000 kHz Amateur Radio
60 meters	4750 - 4995 kHz Broadcasting Stations
49 meters	5950 - 6250 kHz Broadcasting Stations
41 meters	7100 - 7300 kHz Broadcasting Stations
40 meters	7000 - 7300 kHz Amateur Radio
31 meters	9500 - 9900 kHz Broadcasting Stations
30 meters	10100 - 10150 kHz Amateur Radio
25 meters	11650 - 11975 kHz radio stations
22 meters	13600 - 13800 kHz Broadcasting Stations
20 meters	14000 - 14350 kHz Amateur Radio
19 meters	15100 - 15600 kHz Broadcasting Stations
17 meters	18068 - 18168 kHz Amateur Radio
16 meters	17550 - 17900 kHz broadcast stations
15 meters	21000 - 21450 kHz Amateur Radio
13 meters	21450 - 21850 kHz Broadcasting Stations
12 meters	24890 - 24990 Amateur Radio
11 meters	25670 - 27990 kHz broadcast stations, Citizens Band (CB)
10 meters	28000 - 29700 kHz Amateur Radio

Frequency: The transmitter of a radio station is the driving force behind the generation of radio waves. First, the current swings back and forth very quickly, that is, oscillation occurs. After being amplified and processed by the transmitter, the signal is strong enough and is transmitted to the antenna of the transmission tower, where the radio waves are actually generated. See Figure 1, where the curve represents the relationship between intensity and time. Radio waves are generated by electrons flowing along the antenna. Assuming that the left side of the curve is the starting point, we can see that the curve gradually rises from zero and then returns to zero. This means that the current on the antenna runs from one end to the other, generating radio waves. When the current runs back from the other end, a curve below the zero baseline is generated. This back and forth is a cycle. The curve in Figure 1 is the frequency of the radio wave. For example, a MW radio station has a frequency of 1,000,000 cycles/second, but people usually reduce it to 1,000 kilohertz (KHz). KHz is the abbreviation of Kilo Hertz, which means one thousand cycles. However, the frequency in the shortwave band is usually higher (3000-30000 kilohertz). For the convenience of reading and writing, MHz (megahertz) is usually used to represent the shortwave frequency. MHz is the abbreviation of Mega Hertz in English. In many occasions, KHz and MHz are mixed. Therefore, it is best to distinguish the meaning of these two different units and their conversion. To convert KHz to MHz, just move the decimal point forward three places.

For example:

5900 KHz = 5.9MHz 18000KHz = 18 MHz 1 MHz = 1000 KHz = 1000,000 Hz Note: For FM broadcasting, MHz (megahertz) is also used for ease of reading and writing.

Wavelength: Another name often heard in shortwave broadcasting is "meter band" or "meter band" (Meter Band), which refers to the wavelength, that is, the distance between one cycle of the radio wave emitted from the antenna. Assuming that the radio wave in Figure 2 is 15MHz, then its wavelength refers to the distance from point A to point B. If the number of cycles per second is doubled, it becomes 30MHz, which is Figure 3. Observing the waveforms in Figures 2 and 3, it can be found that each cycle of 15MHz contains two cycles of 30MHz, that is, the higher the frequency, the shorter the wavelength.

频率与波长的关系和转换：如何把波长转换成频率，或做相反的转换呢？虽然一个电台以固定的频率广播，但是 "波长"也常被拿来使用。例如，在说明短波传导状況时，使用31米波段，比使用"9500KHz到9900千赫/KHz"（这是在31米波段內规划用做国际短波广播的频率范围）简单多了。把频率换算波长的的公式是波长（米/公尺）＝300,000,000/频率（兆赫/MHz），分子300,000,000米/公尺是无线电波在大气中的传播速度（即光速），所以15兆赫(MHz)的波长是，波长＝300000000/15000000＝20米/公尺。当然短波广播规定有许多的频率范围，要记住这些频率与相对的波长是挺麻烦的，但是只要抓住一个要领，便不成问题了。首先记得一个频率与波长的关系，例如15兆赫(MHz)是20米，然后频率增加一倍，波长便减半，相反的频率减半，波长便加倍。例如15MHz是20米，那么30MHz就是10米，而7.5MHz则是40米，这样就容易多了。

如果上述太复杂，您也可以这样简单地理解：频率是用来表示某电台的精确位置；而波长却是用来表示该电台的大概位置，米波段是用来表示某小段频率范围。

For example, the 19-meter band represents the frequency range of 15.10–15.60 MHz. (Please refer to the international broadcast meter band table below)

Radio spectrum: Usually radio waves refer to the range from extremely low frequency 10KHz to the ultra-high frequency peak 30GHz (Giga Hertz), because the characteristics of the radio spectrum outside this range are very different, such as light, X-rays, etc., and in the above 10KHz to 30GHz, it is usually divided into seven areas, see the table below, among which the high frequency 3~30MHz is the short wave we are discussing.

Division of the radio spectrum:
Very Low Frequency VLF Very Low Frequency Frequency Range 10KHz - 30KHz
Low Frequency LF (commonly known as long wave LW) Low Frequency Frequency Range 30KHz - 300KHz
Medium Frequency MF (commonly known as medium wave MW) Medium Frequency Frequency Range 30KHz - 3000KHz
High Frequency HF (commonly known as short wave SW) High Frequency Frequency Range 3MHz - 30MHz
Very High Frequency VHF (commonly known as ultra-short wave, and civil broadcasting with a frequency in the range of 88-108MHZ is commonly known as FM radio) Very High Frequency Frequency Range 30MHz - 300MHz
Ultra High Frequency UHF Ultra High Frequency Frequency Range 300MHz - 3000MHz
Extremely Ultra High Frequency SHF Super High Frequency Frequency Range 3000MHz - 30000MHz

国际短波广播波段：全世界所有的无线电频率之使用，皆是由国际电信联合会所分配。国际电信联合会（ITU : International Telecommunication Union）是一个隶属于联合国的国际电信管理组织，定期召集各会员国开会决定无线电频率的分配及使用。而ITU所制定的国际短波广播波段共有13个。各米波段都有一定的频率范围，您也许会觉得奇怪，从2.3-26.1MHZ被分成13段，为什么不连贯在一起呢？这是因为：在高频的频谱內（3-30MHz），国际电信管理组织（ITU）有规定，除了国际短波广播外，还有很多其它通讯的用途。您可以很容易地在收音机说明书上找到米波段的划分表。

宋元浩

Thanks for sharing

alan000345

Very useful. Thanks for sharing.