Question about Uniden GMR638-2CK (22 Channels) 2-Way Radio

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Two way radio how to make them talk far 18 miles i am get a mile 1/2 only

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Eighteen miles will never happen unless you're transmitting between two hilltops with a lake between them. The UHF band that GMRS radios operate in is strictly line-of-sight -- if you can't see the other party, he can't hear you. Mileage claims by the radio manufacturers are unrealistic pipe dreams, and the 1/2 mile range you're getting now is very typical..

Posted on Aug 07, 2010

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As a general rule handheld radios will talk up to 2 miles line-of-sight. Anything you place between the two radios will reduce range. Talking from inside a building to outside, you can expect 1/4 to 1/2 mile. This being said, a radio can talk as far as it can see, so if you were on a mountain top, you could conceivably talk many miles into a valley below. Height and placement of your antenna determines range. Holding your antenna upright perpendicular to the earth will give you the best range.

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Motorola mj270r no range


Handheld radios talking line-of-sight with no obstacles will communicate approx. 2 miles. When talking from inside a building to outside, you can expect 1/4 to 1/2 miles range. Holding the antenna perpendicular to the ground gives you the best range. Height and placement of the antenna determines range. If you were on a mountain you could talk many miles into the valley below. However, in real world applications, range is limited. It can even be limited by the body fluid of the person wearing the radio on their hip, or blocked somewhat by the metal of the automobile one is riding in.

Channels 18-22 are listed as GMRS channels and may have more power than 1-17. The FRS channels are limited to 1/2 watt. But don't be fooled wattage doesn't equal distance. Higher wattage may give you a little more distance, but mostly it will give you clarity in the fringe areas.

Here is a link to the user guide: http://www.motorola.com/web/Business/Products/ConsumerTwo-WayRadios/Talkabout-MJ270R-Two-Way-Radio/_Documents/MJ270.pdf

A link to Motorola's page about the radio: http://www.motorola.com/Business/US-EN/Business+Product+and+Services/Two-Way+Radios+-+Consumers/MJ270R_Talkabout_Two-Way-Radio_B2B_US-EN

And I see where they are quoting 27 miles*, and go on to say:
*How far can I expect my radios to communicate? The communication range quoted is calculated under optimum conditions, with an unobstructed line of sight. Actual range will vary depending on terrain and conditions, and is often less than the maximum possible. Your actual range will be limited by several factors including, but not limited to, terrain, weather conditions, electromagnetic interference and obstructions.

Unfortunately, we are seldom in idea conditions. Radio-to-radio is going to get you 1/4 mile to 2 miles in real conditions.

Best regards.

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1 Answer

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Line-of-sight you can talk as far as the radio can 'see'. In the real world, with obstacles and curvature of the Earth, this will vary according to your location. General rule of thumb, outdoors with few obstacles, you can talk line-of-sight up to 2 miles. Talking in and out of a building might reduce your range to 1/4-1/2 mile. There will be circumstances when you could achieve great range such as talking from a mountaintop into a valley, you could potentially talk 25 miles.

Height and placement of the antenna determines range. Holding the antenna perpendicular to the ground will give you the most range. Tilting the radio can reduce your range by as much as 2/3s.

Best regards.

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Sorry to say, to talk 5 miles conditions would need to be ideal. A handheld two-way radio talking radio-to-radio can talk as far as it can see line-of-sight. If you were on a mountain top you might be able to talk many miles into a valley below. However, in real world conditions you would have many obstacles: hills, building, trees, and even the body of the person wearing the radio. Realistically you could talk up to 2 miles line-of-sight, or 1/4 to 1/2 mile if you are talking in and out of a building.

For best range, you can achieve maximum range by holding the radio upright with the antenna perpendicular to the ground, face the direction you are talking and have fully charged or new batteries installed.

Best regards.

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1 Answer

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CB radios are limited to 4 watts input to the 'final'. CB is suppose to be 'line of sight' or about 20 miles. Variables include where you are using the radio ... in the city or in the country ... signal is blocked by buildings and other environmental conditions. A full wave is 36 feet ... is your antenna some number that will multiply to 36 feet? 1/2 wave antenna = 18 feet ... max allowed in the US ... max hight is 20 feet above the mount. If you have an 'old' CB, they were limited to 5 watts to the final. On a good night, one might talk 100 miles away ... but is of course not legal.

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1 Answer

HOW FAR IS THE DISTANCE THAT YOU CAN HEAR ON THE MOTOROLA TR50? I LOST MY OLD MANUAL


Typically handheld radios will talk line-of-sight up to 2 miles. Obstacles you put between the two radios can absorb part of the range. Talking from inside to outside of a building you may only get 1/4 to 1/2 mile. Height and placement of the antenna determines range, so the higher you are the further you will talk. If you were on a mountain top and talking to the valley below, you could talk as far as you could see, which might be significantly more than the 2 miles you would get in normal terrain. (I think the box advertises up to 5 miles, but this would be under ideal conditions, and is not realistic.)

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1 Answer

1/2 mile range max


Advertising on these models is much like reading about a car's MPG, it must be in perfect conditions. Handheld radios generally will talk "radio-to-radio", "line-of-sight" up to 2 miles. Once you start putting obstacles in between the radios you will shorten your range. Even the body fluid of the person wearing the radio on their hip will absorb some of the range. Talking from inside of a building to outside you might expect 1/4 to 1/2 mile. Good rule of thumb: Height and placement of your antenna determines range. The higher the antenna, the further you can talk. If you are talking from on a mountain top to a valley below you can talk as far as you can see. Increasing Range: Hold your radio perpendicular to the ground, not slanted like you would hold a phone. This problem alone could decrease your range 2/3s. Face the direction you are wanting to communicate. Don't shout CB-style, shouting reduces talk-range. Lastly, use good batteries. This will ensure your transmit capability.

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1 Answer

Wanting to know how far this radio will communicate


In reality, handheld radios will talk line-of-sight up to 2 miles. When talking in and around buildings, the range can be reduced to as low as 1/4 to 1/2 mile. For optimal range, be certain to hold your radio with the antenna pointing straight up (perpendicular) to the ground. Height and placement of antenna determines range.

All that being said, many radio manufactures make claims of 5, 10, 18, 25 miles. These claims would be true if one radio can see another, such as talking from a mountain top to a valley. In the real world, we deal with curvature of the earth, hills, buildings, etc.

TalkAbout radios and the other FRS radios operate on 1/2 watt FRS, and 1-2 watt GMRS frequencies. Business radios on the other hand operate on up to 4 to 5 watts of power. The power does not always equate into extra range, it does however, provide much greater clarity in the fringe areas.

Hope this answers your question.

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1 Answer

Tranmitting distance


Generally speaking a 2-way radio will talk as far as it can see. Height and placement of antenna determines range. So if you were talking from a Mountain to a valley you could talk a great distance. However, in the real world there are obstacles, such as trees, houses, varied terrain. You generally would expect a radio to talk line-of-sight up to two miles. Or 1/4 to 1/2 mile if talking from inside a building to outside. The quote of 5 miles in literature is referencing ideal conditions. (Much like when the new car you are looking at quotes the MPG.)

Jul 29, 2008 | Motorola Talkabout T5720 (7 Channels)...

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