1. Improve the transmission power
Almost all the radios have high, middle and low three block transmission power can be adjusted. For ChiJi in hand, the transmit power are generally in 0.5 ~ 5 W choice between; And automotive sets can be in 10 W ~ 40 W choice between. If using low power communication have obvious influence noise communication, then switch to higher transmit power, can improve the quality of communications and extend certain communication distance. The study as long as the transmit power doubled, radio communication distance can be extended to the original distance approximately 1.4 times. But if the transmit power without aim at will increase also can bring increased power consumption, electromagnetic radiation and interference negative effects such as the increase.
2. Improve the rx sensitivity
The intercom rx sensitivity to communication distance of the influence. General handheld radios out, according to related technical requirements sensitivity has transferred to the best condition, in no professional instruments and technical personnel, must not to adjust the radio receiver sensitivity. As for the user, in addition to adjust the radio static noise outside que value, but also through the change of the antenna with high gain ways to increase the intercom rx sensitivity. For example, for the hand of the ChiJi antenna gain the highest lever type; R / 4 whip shape is the second smallest, and spring spiral minimum. Machines outdoor antenna gain while out of the factory has clearly marked, the higher the general gain antennas, the physical size is also more long, receive the ability of the weak signal is stronger also. Change the antenna, attention shall be paid to change with frequency band with antenna (different frequency band antenna is not interchangeable use). Otherwise, will not only improve the rx sensitivity, and may even for antenna don't match and have a great standing wave, and damage rf power amplifier.
3. Try to choose open place on the phone
Manufacturer of theory are given on the communication distance, is actually in the open field barrier-free condition of the inspection. This communication environment with minimal loss of radio waves propagation, and reinforced concrete building in the city of waves absorption is serious. A team of nominal open areas communication 3 kilometers interphone, in this building used in only a few hundred meters of communication often distance. So in indoor use brand should choose as far as possible on the window position, outdoor use is to avoid high buildings or trees around the block.
4. Try to rack high antenna
The increase of the antenna height for expanding communication distance is very effective. Without any increase in transmission power, under the premise of collection, transmission aerials each additional times, also can make communication distance to expand the original 1.4 times or so, already economy, and environmentally friendly. General in urban areas outdoor communication in 3 ~ 5 km from the hand ChiJi, if one of them on the shelves in the 5 top connect the outside antenna, May 20 kilometers apart and the other one of outdoor use to keep on the scout. The author once test; In the urban district outdoor communication about 4 km distance of an opponent ChiJi, will carry only one from downtown to about 100 miles (kilometers) of the top of the hill, the machine can still keep and urban radio can scout. Strongly suggest the scout in the car use the antenna friends. You know, every 3 DBi gain equivalent to the radio transmission power will you a fourfold increase. At the same time avoid you hand in the car, the signal shield machine and the radiation of the car body.
Set in the home of a classmate recommend using great bar antenna, he gain high, strength, and ease of installation.
5. Choose communication environment and the direction is important, sometimes will make much difference between the quality of scout happened
Generally we should follow the following principles:
A, try to choose A higher point dedicated terrain, such as if you can scout in the second floor is not on the first floor.
B, choose as far as possible in the outdoor, scout, because the building wall of 70 to of the reflection and attenuation performance is very severe.
C, try to avoid arms of the buildings in the district, the density of the old buildings are large, thick trees, where the high buildings, surrounded by large sections of car surrounded, tunnels and Bridges, large metal billboard in front.
D, use urban canyon: that is very important, our big cities with tall buildings, building intensive, it's hard to find the real spread beyond opportunity, so we will make good use of existing environment. The city is building lined canyon dense, lofty, the road wide bend small trunk pass. Even in its at the intersection of the same on travelling scout (such as vertical, diagonal section), then general is also good scout effect. If both parties are dedicated in the complicated path or complex, scout effect will is poor. So we offer, if you're ready to drive.. please into wide road again after the start.
E, choosing the right direction, with you in the scout between point, try to avoid tall buildings and metal body keep out. If you put it at the back of the direction you scout, still can rise to signal reflector role.
F, the night than during the day, scout, scout the effect is good.
G, scout than moving dot scout the effect is good.
6. A good use
Always check the intercom usually pay attention to the battery power is enough, the antenna and connection are strong, antennas are completely out bars, etc, these factors are directly influence the radio transmission power and receive sensitivity, affect communication distance. In addition, can't use damaged and deformation of the antenna. Especially the Taiwan users, the antenna on the roof position very easily with driving the turbulence or scrape ceng because trees and damage the antenna, lead to communication distance obviously reduced.
