Jan.2021 05
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Explanation of Intercom Distance
Explanation of Intercom Distance
In the wireless communication industry, the concept of distance is generally not mentioned, because radio propagates signals by electromagnetic waves, and there are many factors affect the propagation distance of wireless signals. The internal influencing factors include the transmission power of the equipment, receiving sensitivity, antenna gain and height. External influence factors include obstruction and interference by buildings, hills, trees, electromagnetic fields, etc., which affect the actual communication distance and quality.
Although the communication distance of walkie-talkies is difficult to identify, people are still very concerned about it. GPCOMM Technology is a professional manufacturer of walkie-talkie accessories and communication noise reduction headsets. Based on customer feedback and industry experience, it is An approximate effective range of the walkie-talkie is provided for your reference:
1Handheld walkie-talkie
7W transmitting power: 2-4 kms in urban area, 4-7 kms in open area;

5W/4W transmitting power: 1-3 kms in urban area, 3-5 kms in open area;
3W/2W transmitting power: 500m-2kms in urban area, 1-3kms in open area;
1W/0.5W transmitting power: 200-800ms in urban area, 500m-1.5kms in open area.

This is AG-10 of GPCOMM, it provide hands-free solution
2Mobile Wakie Talkie
50W/40W transmitting power: 5-15 kms in urban area, 10-25 kms in open area;
25W/20W transmitting power: 3-10 kms in urban area, 5-15 kms in open area;
10W/5W transmitting power: 1-5 kms in urban area, 3-8 kms in open area;
3Short Wave Walkie Talkie
With the support of external environmental factors, short-wave walkie talkie makes inter-provincial or even cross-border communication possible, but short-wave walkie-talkies require an amateur radio operation certificate of level 3 or higher, otherwise it will be regarded as illegal operation.
4Truncked Walkie Talkie
The communication distance is very long, and it can basically communicate in the whole city. It is generally used in public security networks and requires high cluster networking costs.
5 Install Repeater
The cost of repeater is relatively high, but handheld walkie-talkie and mobile walkie-talkie can increase the effective communication distance by connecting the repeater.
Note for walkie-talkie:
In the world, wireless walkie-talkies usually use frequency bands of 136-174MHZ and 400-470MHZ. These two frequency bands are also the frequency bands allowed by the law to be used by individuals or units. Under normal circumstances, these two bands propagate in a straight line. The sea is an ideal communication environment for radio walkie-talkies on the earth. There are generally no obstacles and minimal interference. However, in fact, the mobile phone can only communicate with 20. Around the sea, that is because the earth is round. If the distance is too far, the middle will be blocked by the sea. If the antenna is installed higher, the communication distance will be farther. Usually when use in cities, obstacles are the factor that has the greatest impact on the signal propagation distance. The actual talking distance of professional walkie-talkies with a power of 5W in urban areas is generally only within the range of 2-4 kilometers. In depressions, many buildings or sealed rooms, the communication distance will be shorter. And the distance will be farther if the two walkie-talkies are at a high enough height.

                                                                                                                                                                                           Refer to the product's manual