# Line of sight (LOS)

The line of sight (LOS) is the direct optical path between an observer and a point of interest. In radio wave propagation, line of sight is the distance over which the wave can travel directly from the transmitter to the receiver, without being obstructed by intervening objects. In order to establish line of sight between two points, both the transmitter and receiver must have a clear view of each other. This is usually accomplished by placing the transmitter and receiver at high elevation, such as on top of a hill or tall building.

In wireless and mobile communications, line of sight is often used to determine the maximum range over which a signal can be transmitted. For example, a mobile phone typically has a range of about 10 kilometers (6 miles) when used in an urban environment, and about 30 kilometers (19 miles) when used in a rural environment. The range of a signal can be increased by using a higher-powered transmitter, or by placing the transmitter and receiver at higher elevation.

#### What is line of sight range?

The line of sight range is the distance at which a wireless signal can travel directly between two points without being interrupted by any physical objects. This range can be affected by factors such as the height of the antenna, the type of terrain, and the weather conditions.

### What is the difference between LOS and NLOS?

LOS (line of sight) and NLOS (non-line of sight) are two different types of communication between two points. LOS communication requires a direct, unobstructed path between the two points, while NLOS communication does not require a direct path and can work around obstacles. NLOS is typically used in urban areas, where there are many obstacles that can block a direct LOS path.

#### Why VHF is line of sight?

The answer to this question has two parts. First, let's define what we mean by "line of sight." In general, line of sight means that there is a direct, unobstructed path between two points. In the context of radio waves, line of sight means that there is a direct, unobstructed path between the transmitter and the receiver.

Now that we've defined line of sight, let's talk about why VHF is line of sight. The answer has to do with the wavelength of VHF waves. VHF waves have a wavelength that is much shorter than the wavelength of HF waves. As a result, VHF waves are much more directional than HF waves. That is, VHF waves are more likely to travel in a straight line from the transmitter to the receiver, without being scattered or diffracted by obstacles in the environment.

One final note: it is possible for VHF waves to be scattered or diffracted by obstacles in the environment, which can result in non-line-of-sight (NLOS) transmission. However, this is generally less common for VHF than for HF.

#### How do I fix los in WiFi?

There are a number of things that could be causing loss of WiFi signal. Here are some potential solutions:

1. Check for interference from other devices. If there are other devices in the area that are using the same frequency as your WiFi router, they can cause interference and cause your signal to drop.

2. Check the physical connection between your router and your computer. If the connection is loose or there are any breaks in the cable, that can cause signal loss.

3. Check your router's settings. If your router is not set up properly, it can cause signal loss.

5. Move your router to a different location. If your router is in a location where there are walls or other obstacles between it and your computer, that can cause signal loss. Try moving your router to a different location and see if that improves your signal.

### Why is my Los blinking red?

There are a few reasons why your Los might be blinking red. The most common reason is that the battery is low and needs to be charged. Other reasons include a loose connection, an error in the software, or a problem with the hardware.

If the battery is low, you'll need to charge it before using your Los again. To do this, simply connect the Los to a power source using the included charging cable.

If there is a loose connection, you'll need to check the connections between the Los and the charging cable, as well as the connections between the Los and any other devices it's connected to. Make sure that all of the connections are secure and there are no loose wires.

If there is an error in the software, you'll need to update the software on your Los. To do this, connect the Los to a computer and follow the instructions on the screen.

If there is a problem with the hardware, you'll need to take the Los to a qualified technician for repairs.