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You may have seen radios at a discount store or the local sporting goods store that advertise two way radios with a range of 10, 20 or even more miles. This is purely bogus. If bogus sounds too harsh to you...just ask the seller to demonstrate the advertised two way radio range. He will not be able to do it.
Two way radio range is determined by three factors:
1. Frequency
2. Power (wattage)
3. Obstacles
Radios operating in the VHF band travel the furthest but have little penetrating ability. Radios operating in the UHF band do not travel quite as far but have greater ability to penetrate buildings and forests.
Commercial grade hand held two way radios are limited to no more than 5 watts of power. Some radios have as little as a quarter or a half a watt. This is usually expresses as milli watts...250 mWatts or 500 mWatts. The greater the wattage the greater the two way radio range.
Obstacles include any solid object like building and hills or other radio waves or electrical interference.
A good rule of thumb for determining two way radio range is 1 watt of power will provide 1 mile of coverage in an open area. By doubling the wattage the two way radio range is increased by one third. For example a two watt radio should provide about one and a third miles of coverage. A four watt radio should provide about 2 miles of two way radio range.
Two way radio range can be increased with the use of a better antenna, a repeater or more power.
Get your free copy of our “Little Green Radio Book” for more detailed information or give us a call at 1-239-572-2811.
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