You are missing very important info. Well, although it sounds like a very straightforward question, the answer is a bit complicated. This is a macro form of intervening terrain. It's a no-brainer, and a silly point to argue indeed. Cosmic microwave background radiation (observed by radio telescopes) comes from the edge of the observable universe (over 5 billion light years away). Attenuation due to the curvature of the earch. This equates to an area of almost 1300 NM² blanketed by your signal and preventing any one else the use of that frequency. As a broad rule of thumb, the distance to the radio horizon of a transmitter or receiver, in miles, is 1.34 times the height of the antenna, in feet. Other factors are, the weather, the HAAT which is height above average terrain. When you consider that at 25 watts you may have a transmission radius of 20 NM. General Mobile Radio Service or GMRS are higher powered devices that use systems and repeaters to increase the range of the radio. One of the radios being considered is 65-watts. There are a few variables that determine the range of a CB radio. different. However, the chart was not created to discuss such a comparison, since there are no 50 watt handheld GMRS radios on the market, at … You could have two different people both using a 100 Watt FM transmitter and one of them will be getting 15 miles while the other person is only getting 1 mile. The question came up while discussing a research project and how we could transmit data from a site without reliable cell coverage. Radio Distance Range Comparison of Ham CB FRS MURS GMRS Radios. Sure, a 50 watt system will provide greater range than a .5 watt radio by default. That is, how far will the signals of their CB radio actually reach? (Note: Keep in mind that in our real world, not the smooth, bald, whimsical one, western Kansas is almost 4000 feet above sea level. I don't have a license yet but it's in the works. However, if you bumped up the transmit power substantially, you might be able to hit the repeater from the Sunflower State. Reducing the power of your radio to 1 watt for short distance communications is a simple courtesy. But elevate the antenna on a tower or mountain top and all bets are off. The most important factor of all perhaps is the antenna. FRS radios have a maximum allowable power of 2W. \$\endgroup\$ – SpecialAgent_W436 Jul 26 '11 at 23:53 There is so much more to how far your signal travels than just wattage. A quarter wave at ground level and 15 watts will have a certain reach. Generally, 0.5 watt (o.5W) channels cover less than a half mile while 2W channels work up to two miles. In fact, simply putting a 100 watt linear on a radio is not going to do a whole lot for you. The talk distance is the sum of the radio horizons of the transmitter and the receiver. There is no theoretical limit for the distance to receive a radio signal. There is just not much remaining of a 5 watt HT signal after 171 miles. Covers Ham HF, 11 meters, CB, SSB, VHF FM, 2 meters, 10 meters, UHF walkie talkies, handy talkies, HT, … A 12 Watt transmitter using a high gain antenna like the Aareff 5/8's vertical which as a gain of 4.8 dBi, and using 25 metres of RG213 low loss coax would effectively double the power to … That depends on a number of variables and you have not given me the specifics. People owning a CB radio often have one very common question. The single biggest factor in how far you signal goes is your antenna. So as you can see by the above list there is no one single answer to the question.

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