Hello Octave,
Thank you for contacting the Sales Acceleration Center (SAC) regarding your recent inquiry, Case Number 80713
Case Description:
Radio Range
Case Solution:
On the Calculator will be giving you number related to the lost of the signal (Radio Wave) base on obstructed or unobstructed / Urban and Suburban.
You need to input the number or estimate that you will get 70% to 80% accurate... and you could do a sample Survey on the area...
To help you lets go with basic... Terms
LOS: Loss of Signal
Loss of signal (LOS) is a condition where the received signal drops below threshold due to a terrain obstruction or other phenomenon increasing the link budget loss beyond design parameters.
LOS: Line of Sight
Line of Sight (LOS) describes an unobstructed radio path or link between the transmitting and receiving antennas of a communications system. The opposite to LOS is NLOS, or Non Line of Sight.
NLOS: Non Line of Sight
Non Line of Sight (NLOS), also known as near-line-of-sight or obstructed path/pathway, is a term used to describe radio transmission across a path that is partially obstructed, usually by a physical object in the Fresnel zone. Many types of radio transmissions depend, to varying degrees, on line of sight between the transmitter and receiver. Obstacles that commonly cause NLOS conditions include buildings, trees, hills, mountains, and, in some cases, high voltage electric power lines.
PLE (Path Loss Exponents or Path Attenuation )
Path loss normally includes propagation losses caused by the natural expansion of the radio wave front in free space (which usually takes the shape of an ever-increasing sphere), absorption losses (sometimes called penetration losses), when the signal passes through media not transparent to electromagnetic waves, diffraction losses when part of the radiowave front is obstructed by an opaque obstacle, and losses caused by other phenomena.
The signal radiated by a transmitter may also travel along many and different paths to a receiver simultaneously; this effect is called multipath. Multipath waves combine at the receiver antenna, resulting in a received signal that may vary widely, depending on the distribution of the intensity and relative propagation time of the waves and bandwidth of the transmitted signal. The total power of interfering waves in a Rayleigh fading scenario vary quickly as a function of space (which is known as small scale fading). Small-scale fading refers to the rapid changes in radio signal amplitude in a short period of time or travel distance
Fresnel zones
If unobstructed, radio waves will travel in a straight line from the transmitter to the receiver. But if there are obstacles near the path, the radio waves reflecting off those objects may arrive out of phase with the signals that travel directly and reduce the power of the received signal. On the other hand, the reflection can enhance the power of the received signal if the reflection and the direct signals arrive in phase. Sometimes this results in the counterintuitive finding that reducing the height of an antenna increases the SNR.
Fresnel provided a means to calculate where the zones are, where a given obstacle will cause mostly in phase or mostly out of phase reflections between the transmitter and the receiver. Obstacles in the first Fresnel zone will create signals with a path-length phase shift of 0 to 180 degrees, in the second zone they will be 180 to 360 degrees out of phase, and so on. Even numbered zones have the maximum phase cancelling effect and odd numbered zones may actually add to the signal power
I HOPE THIS HELP.... PLEASE ADVISE IF YOU NEED MORE INFO
I am going to close the case for this specific inquiry. We strive to provide you with excellent service. Please feel free to reach out to me or any member of the SAC team if we can be of any further assistance or if you have any other related questions in the future. We value your input and look forward to serving you moving forward.
