Saturday, January 31, 2015

Radio Frequencies

Radios and Frequencies Todays post is about radios in general.

There are so many radios out there to choose from, from very cheap to extemely expensive, plus all sorts of different uses, features.  It can be difficult to understand.  At current, I am not a licensed amatuer radio operator, therefore I do not transmit on the bands that require a license.

The different "services" that most people know of, are the FRS, GMRS and MURS.

There are different classifications of radio frequencies, from 0 hertz (hz) to ranging in Gigahertz (one ghz is equal to one billion hertz).  They are generally classified from in low, medium, high, very high, and ultra high frequencies.  There are classifications below low frequency, but for the sake of simplicity, I will include them in low frequency, or LF.   I also won't include above UHF, for the sake of a short article


Low Frequency LF 0 Hz TO 300 KHz
Medium Frequency MF 300  KHz to 3000 KHz
High Frequency HF 3 MHz to 30 MHz
Very High Frequency VHF 30 MHz to 300 MHz
Ultru High Frequency UHF 300 MHz to 3000 MHz

Generally, those in the HF range, have much further distances than do those in the VHF and UHF frequency ranges.  You will see in bands mentioned and measure in meters and smaller measuremets.  They are measuring the wavelength of the radio frequency.  Similar to that of electricity of waves of water.


FRS/GMRS

Radios and Frequencies The family radio service, or FRS, and GMRS, general mobile radio service operate between 462 to just below 468 MHz.  They are all limited in range, by many factors, including frequency and regulation.  The FRS is limited to .5 watt

Todays post is about radios in general.

There are so many radios out there to choose from, from very cheap to extemely expensive, plus all sorts of different uses, features.  It can be difficult to understand.  At current, I am not a licensed amatuer radio operator, therefore I do not transmit on the bands that require a license.

The different "services" that most people know of, are the FRS, GMRS and MURS.

There are different classifications of radio frequencies, from 0 hertz (hz) to ranging in Gigahertz (one ghz is equal to one billion hertz).  They are generally classified from in low, medium, high, very high, and ultra high frequencies.  There are classifications below low frequency, but for the sake of simplicity, I will include them in low frequency, or LF.   I also won't include above UHF, for the sake of a short article


Low Frequency LF 0 Hz TO 300 KHz
Medium Frequency MF 300  KHz to 3000 KHz
High Frequency HF 3 MHz to 30 MHz
Very High Frequency VHF 30 MHz to 300 MHz
Ultru High Frequency UHF 300 MHz to 3000 MHz

Generally, those in the HF range, have much further distances than do those in the VHF and UHF frequency ranges.  You will see in bands mentioned and measure in meters and smaller measuremets.  They are measuring the wavelength of the radio frequency.  Similar to that of electricity of waves of water.


FRS/GMRS

The family radio service, or FRS, and GMRS, general mobile radio service operate between 462 to just below 468 MHz.  They are all limited in range, by many factors, including frequency and regulation.  The FRS is limited to .5 watts of transmittion power are required to have a non detachable antenna, and do not require a license to transmit.  The GMRS requires a license, but can be operated at high transmittion power, possibly up to 5 watts.  The FRS and GMRS shart close frequencies, if you operate on the shared FRS/GMRS frequencies at no more than .5 watts, then you don't need a license.  If you do operate higher than .5 on the shared frequencies, then you are legally required to have a license.

MURS

The multi use radio service, or MURS, operates in channels between 151 MHz and just above 154 MHz.  It is the least regulated overall.  It can have a detachable antenna, is limited to 2 watts of transmittion power and does not require a license to operate in.  A lot of business still use these frequencies.  They used to be used by business almost exclusively.  I prefer these frequencies for use by non licensed individuals.  I do, however, suggest highly that you do get your amatuer license, its cheap and no one will talk to you on amatuer frequencies if you do not have a license.

Amatuer/HAM radio

A big subject to get into.  There are multiple levels of licensing.  Do your research and study for this.  It would be a very good idea to get your license.  If you wish to discuss further, please message me, or speek with your local amatuer radio operator.  They aren't as weird as they may be portrayed or seem.  Their hobby is just more technical.

In the next segment will be different radios, accessories and others of the like.  Stay tuned for more.


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