However, each time a radio signal passes through an object the signal strength is reduced. Well in reality, what they are saying, is "if the horizon is not a factor, say you are on top of a mountain, and there are no obstructions (clear line-of-sight), then there is enough signal strength for the signal to carry for 36 miles. A mobile radio, which has between 25 and 50 watts of output power, is hooked up to the mains or to a car battery and is a pretty substantial radio. Although microwaves are small, they are still bigger than the tiny holes in the metal mesh. If you are using the radio in or around buildings, in urban areas, or heavily wooded areas, then UHF is a better choice because it's signal will navigate around obstacles better. For any given antenna height use this formula: Horizon at Ground Level (in kilometers) = 3.569 multiply by the square root of the Antenna Height (in meters). The two most commonly used frequency ranges for two-way radios are VHF (Very High Frequency 130-174MHz), and UHF (Ultra High Frequency 400-520MHz). Neither is inherently better, they each have strong points and weaknesses. The two frequency ranges (also called "frequency bands") used in most two-way radios are VHF (Very High Frequency), and UHF (Ultra High Frequency). The stronger the signal strength, the more it can withstand weakening when it passes through obstacles. VHF signals are often blocked by metal within the building. It's because of the difference between how VHF vs UHF signals react around structures. Raising the receiving antenna's height would extend the line-of-site even more. That's because the type of equipment and terrain can greatly affect your range. "Why?" So if range is important to you, look for a radio with a whip antenna, or at the very least, one where you can remove the stubby antenna and replace it with a whip antenna. Radios featuring the advantages of basic digital, plus advanced features like bluetooth, gps, trunking, and intrinsically safe options. Commercial radio stations typically broadcast at 50,000 or 100,000 watts. Also, mount your antenna in a straight-up position, not at an angle. Even though VHF can pass through obstacles better and travel farther, that doesn’t mean it's always the better choice. But marine radios have a big advantage, there are no obstacles on the open water! Not all antennas on handheld radios are the same. you ask. Mobile radios usually broadcast from 25 to 100 watts maximum. "Why?" What can you do to make it more like 6 miles than 4 miles? Horn alert capability enables base station operator to issue a 2-Tone, 5-Tone or DTMF signal remotely to activate the car’s horn to go off as an additional emergency alert to draw attention to the vehicle. First, not all radio signals are the same. It's because of the difference between how VHF vs UHF signals react around structures. Mobile radios usually broadcast from 25 to 100 watts maximum. The key words in the advertisement are \"up to\". So according to our rule-of-thumb, 2 people around 6 feet tall using a 5 watt handheld two-way radio, used on flat ground with no obstacles, will have a maximum range of approximately 6 miles. Thus, two people carrying a handheld two-way radio, the maximum communication distance on flat ground with no obstructions is approximately 6 miles. x 8.66in. Installed in vehicles, they run off the vehicle's battery. If you have offices on the same computer network, radios from one office can talk to the other locations, even if these offices are thousands of miles apart. In other words, the exact distance to the horizon varies depending on your antenna height. No single factor is a silver-bullet to extend your communication range. Communication distance can be somewhat improved (25%to 50% further) over this on VHF and UHF by the use of a gain antenna.The distance can be adversely affected by interference from the vehicle engine; further distance can be achieved by parking on a hilltop or open area and shutting off … is one of the most common questions people ask when buying a two-way radio. One last thing we didn't mention is the weather, and other atmospheric conditions can affect radio transmissions. So if the antenna height is at 6 feet tall (1.82880 meters), times the horizon (3.569), equals 4.83 kilometers, or 2.99 miles away. Their biggest advantage is to extend the communication range beyond the capabilities of an RF system, but it's important to understand the differences, advantages, and disadvantages of each. The base station can then alert the field unit to move back into range. So how far can you really expect to talk? When we said "the distance to the horizon is the maximum communication range" we didn't mention one key factor, your antenna. Also, the denser an object, the more it reduces the signal strength. Remember, UHF signals are shorter than VHF, this is important when you're in or around buildings. See what a difference antenna height can make? Unfortunately there isn't a quick answer. Even though VHF can pass through obstacles better and travel farther, that doesn’t mean it's always the better choice. Orders placed before 3:00 p.m. EST for in-stock items will be processed the same day. Remember we said you might only get 4 miles range or less? Enter your email and we'll email you instructions on how to reset your password. Please. Unlike frequencies below 2MHz, radio waves in these higher frequencies travel in straight lines (called "line-of-sight" signals), and generally cannot travel beyond the horizon. Assume you are trying to communicate from one side of a commercial building to the other. You often see ads for two-way radios saying \"up to 36 miles\" or more. The UHF wavelength is roughly one and a half feet wide, the VHF wavelength is roughly five feet wide. Either VHF or UHF radio technology can work for you if you don’t really have a long range to cover. But keep reading, there are other things to consider as well, such as power and obstructions. Satellite radios communicate through an array of satellites know as the Iridium satellite constellation. Yaesu FT-8900R Quad Band Hi Power FM Amateur Ham Radio Transceiver. However, when communicating on SSB channels, both the sending and receiving radios must have SSB channels. Antenna type can have a significant effect on range. you ask. A stronger signal is capable of withstanding successive passes through obstacles, allowing it to travel farther. Compatible with other analog radios within the same frequency band. Perfect for those looking for the longest range possible and easy setup, such as companies operating vehicle fleets in large metropolitan areas. Ever wonder why microwaves don't pass through the glass door? For mounted antennas, mount your antenna standing straight-up on the highest point possible. Metal is not your friend when it comes to radio communications. Antennas on boats are much the same. Most companies already have IT departments, which will readily understand these products. If you are at the edge of your communication range and your signal is weak, One of the easiest ways to increase your range is to increase your height. No worries. We have the largest in-house inventory in our industry so that we can provide the fastest delivery for our valued customers. JavaScript seems to be disabled in your browser. So the distance to the horizon is the maximum communication range for these two way radios, without the aide of additional equipment to "boost" the signal. For handheld radios, instead of a stubby antenna, get a whip antenna to maximize your range. Microwaves are extremely high frequency with small signal waves. Uniden PRO401HH Professional Series 40 Channel Handheld CB Radio, 4 Watts Power with Hi/Low Power Switch, Auto noise cancellation, Belt Clip And Strap Included, 2.75in. Base station antennas are located on the roof of a building, and commercial broadcast antennas are usually located on mountain tops or very high towers. New Technologies for Long Range Communication. From the air it gets even better. Other handheld radios such as marine, aviation, and licensed land-based radios such as: LMR, Ham, & GRMS are limited to 5 watts, again radios with SSB can have 12 watts. The key words in the advertisement are "up to". For mounted antennas, it's important to mount your antenna on the highest point possible. Remember the higher your antenna the father the horizon is. But marine radios have a big advantage, there are no obstacles on the open water! A stronger signal is capable of withstanding successive passes through obstacles, allowing it to travel farther. We place orders daily with our partners and in many cases have equipment already in route to our warehouse. 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