cheap 2 Way Radios There are two major formats for two-way radios. they’re Ultra High Frequency (UHF) radio and really High Frequency (VHF) radio. Neither frequency band is inherently higher than the opposite. They each have their pluses and minuses. each formats are effective ways that to communicate with another person. but how do you decide that one will fit your needs? Let’s check the key components of each frequencies to help you opt.Two-way radios communicate with one another through use of radio waves. Radio waves have totally different frequencies, and by tuning a radio receiver to a particular frequency you’ll be able to pick up a particular signal.Radio waves are transmitted as a series of cycles, one once the other. you’ll continually see the “Hz” abbreviation used to indicate the frequency of a radio. Hertz is equal to a minimum of one cycle per second.Radio waves are measured by kilohertz (kHz), that is equal to 1000 cycles per second, or megahertz (MHz), which is equal to 1,000,000 cycles per second–or one thousand kHz. the link between these units is like this: one,000,000 Hertz = 1000 kilohertz = 1 megahertz.You may conjointly hear the term “wavelength” when you hear about radio waves. This term is from the first days of radio when frequencies were measured in terms of the space between the peaks of 2 consecutive cycles of a radio wave instead of the amount of cycles per second. Lower frequencies manufacture a extended wavelength.While wavelength measures distance between the peaks of cycles, frequency refers to how long the measured time is between the “crest” and “trough” of a wave arriving at the source. thus frequency measures time rather than distance, but they are primarily each saying identical factor.What is vital regarding wavelength for two-way radios is that it affects transmission vary below sure conditions. a longer wavelength as a general rule lets a radio signal travel a greater distance.Lower frequencies or wavelengths have greater penetrating power. that’s one of the reasons they’re used for communicating with submarines. VLF radio waves (3-30 kHz) will penetrate sea water to a depth of approximately 20 meters. thus a submarine at shallow depth can use these frequencies.So from what you read on top of you may think VHF is often the better choice for a two-way radio regardless of where you’re using it. that is not essentially true. even though VHF has better penetrating capabilities, that does not necessarily build it the higher alternative for buildings. keep in mind the conversation concerning wavelength above? Wavelength encompasses a massive impact on transmission.To explain this let’s assume we are communicating from one side of an advertisement building to the opposite. In between these two points is a metal wall with a three foot door in it. Metal is an enemy to radio waves and they generally don’t meet up with it.For our example let’s assume that the UHF wavelength the radio uses is a couple of foot and a [*fr1] long and a similar VHF radio is around five feet long. These are in the ballpark of their traditional wavelengths.When the UHF transmits its signal the foot and a half long wave can experience the door since the door is wider than the wavelength. The VHF signal are progressing to be totally mirrored since it is wider than the opening to the door.Your microwave oven is an example of this. The glass front door incorporates a metal mesh with terribly little holes. Microwaves being a really high frequency have wavelengths that are solely many inches long. The mesh keeps the microwaves trapped in the oven but it permits you to envision inside because light-weight waves have a microscopic wavelength.Just imagine walking through the building carrying a 5 foot wide pole. you’ll encounter identical challenges a VHF signal encounters. now imagine walking through the building with a pole that is only a foot and a 0.5 wide sort of a UHF wave. There are heaps fewer doorways you mightn’t get through.The one distinction is that wireless signals will penetrate through drywall, masonry, human bodies, furniture, wall paneling, and different solid objects. all these objects will reduce the signal strength though. The a lot of dense the item, the a lot of it reduces the signal. VHF will penetrate these obstacles better than UHF, however that doesn’t essentially mean that VHF is healthier for indoor applications as we are going to name in the UHF section below.In our example higher than we have a tendency to assumed you had a metal wall with an opening. If you reverse this and you have got a three foot metal object in front of the transmitting radio, then VHF would win. Since the object is 3 foot wide it’ll totally block the UHF signal whereas the VHF signal will get around it. Lower frequencies like VHF diffract around giant smooth obstacles additional easily, and they additionally travel more easily through brick and stone.For most applications, lower radio frequencies are higher for extended vary. A broadcasting TV station illustrates this. A typical VHF station operates at regarding a hundred,000 watts and includes a coverage radius range of about sixty miles. A UHF station with a 60-mile coverage radius needs transmitting at 3,000,000 watts.So there’s no clear alternative for which is best, VHF or UHF. there’s a lot of “black magic” to radio technology so it’s not forever easy to inform which will work higher for your application. to help you choose on the best technology for you, a lot of detail regarding each one is included below.UHF RadioUHF equipment operates between the frequencies of three hundred MHz and 3000 MHz. till recently, it wasn’t widely used. Now, the UHF radio frequency is employed for GPS, Bluetooth, cordless phones, and WiFi.There are additional accessible channels with UHF thus in more populated areas UHF is also less probably to own interference from different systems. If you are in a district where population is thin, VHF should work fine for you. Not too some time past the FCC also opened a replacement VHF frequency known as MURS that is so far not heavily utilized in most areas. there’s more concerning MURS below within the VHF section. If you are in a vicinity where interference from alternative radios may be an issue, UHF transmitters and receivers can be your best option unless you use a MURS VHF radio. UHF is healthier at squeezing through physical barriers like walls, buildings, and rugged landscape. something that obstructs a radio wave, will weaken a radio signal. UHF lessens that result. Though it may not travel as far, UHF radio waves will traverse around obstacles better than VHF.To highlight the differences in indoor range, below is an excerpt from a brochure of a number one two-way radio maker on the predicted range of 1 of their lines of handheld VHF and UHF two-way radios:”Coverage estimates: At full power, line-of-sight, no obstructions the vary is approximately 4+ miles. Indoor coverage at VHF is approximately 270,000 sq ft and three hundred,000 sq ft at UHF. Expect regarding 20 floors vertical coverage at VHF and up to thirty floors at UHF. Note: range and coverage are estimates and aren’t guaranteed.”VHF waves are not excellent at finding their means around walls, buildings and rugged landscape. thus vary are going to be significantly reduced for VHF radios in these environments. which will not essentially be a drag if the vary required is barely a number of hundred feet. you can also add an external antenna to an enclosed VHF base station which will cut back or eliminate this downside.One of the downsides to UHF is that the FCC needs you to get a license to operate in these frequencies. although many frequencies within the VHF business band also need a license. If you choose a radio in the VHF MURS frequencies you’ll be able to operate it while not a license. UHF equipment is typically costlier. The elements have to be compelled to be finely tuned and are costlier to construct. This does not mean it’s necessarily higher, just dearer.One advantage of UHF transmission is that the physically short wave that’s produced by the high frequency. meaning the antenna on the radio can be shorter than the same VHF radio.VHF RadioVHF equipment operates between the frequencies of thirty MHz and three hundred MHz. FM radio, two-way radios, and television broadcasts operate in this range.Both UHF and VHF radios are susceptible to line of sight factors, however VHF a trifle more so. The waves make it through trees and rugged landscapes, but not as well as UHF frequencies do. However, if a VHF wave and a UHF wave were transmitted over a district without barriers, the VHF wave would travel virtually twice as way. This makes VHF easier to broadcast over a protracted vary. If you are operating principally outdoors, a VHF radio is perhaps the simplest choice, especially if you’re employing a base station radio indoors and you add the external antenna.Since VHF has been around longer and isn’t as difficult to make, equipment is sometimes cheaper in comparison to similar UHF equipment. One disadvantage to the current equipment can be its size. Since the frequency waves are larger, an antenna should be larger.VHF radios even have a smaller variety of obtainable frequencies. Interference with other radios might be additional likely to be a tangle. However, the FCC recently created this less of a retardant once they opened up the MURS frequencies. The 150 MHz frequency is a voters Band radio spectrum that’s referred to as the MURS service. MURS stands for Multi-Use Radio Service. This service is for use within the u. s. and Canada. it’s an occasional power, short vary service in the VHF a hundred and fifty MHz voters Band radio spectrum. There are 5 channels in the MURS frequencies with thirty eight privacy codes under each one that enable you to solely acquire conversations on your code. The FCC doesn’t require users of merchandise for MURS to be licensed.With MURS you’ll be able to add a bigger or external antenna to enhance range. If you would like to put an antenna on top of your house or business, you’ll be able to do it with MURS. Some antenna manufacturers claim an external antenna can increase the effective radiated power of a transmitter by a factor of four. These MURS intercoms can transmit up to four miles, and maybe additional with an external antenna depending on the terrain.One good thing about VHF wireless radios is that battery life is almost forever higher than for similar UHF units. For handheld radios this can be a plus.VHF equipment is usually lower cost for those on a budget. Equipment will be additional economical than similar UHF products.In summary, if you’re designing on using your two-way radios mainly within buildings, then UHF is probably going the simplest resolution for you. If you’re mainly using your two-way radios for communication outside, then VHF would be a decent selection. Either radio technology will work for you if you do not very have a protracted vary to hide. In that case you will need to decide on VHF for it’s lower cost.