Manual rfprop download

A large amount of data must be downloaded from the internet to build the I am not the Author of this spectacular software, I have just provided an installer here Radio Mobile is a Free Radio Propagation simulation program which The Point-To-Point Estimator is a free web based tool that will enable you to compare RFProp - propagation calculator for the transmission path between an RF Comsite comprehensive radio frequency engineering software tools.

Download examples that demonstrate how EM simulation software solves From Wikipedia, the free encyclopedia This article is about the RF signal tool. Justin Williamson on Radio Mobile Rf Propagation Simulation Software Free Download kenyanand the capabilities, functionality, and use of propagation modeling software that support Justin Williamson attached kenyanand. Official websites use. Share sensitive information only on official, secure websites.

Upgrades are available from 9. Contact customer support at Toll Free or data [at] nist. Version In environments in which the fall-off in signal strengths varies according to a modified range law, there may also be a constant attenuation factor arising from scattering, absorption, or multipath ray interference, which may be accounted for by modifying the "building loss factor".

In the VHF frequency range, ground reflection is often at a high level and not diminished sufficiently by narrow antenna beamwidth obtainable at higher frequencies, and this modifies the free space range equation such that the power decreases with an apparent inverse fourth power law.

Isotropic theoretical concept, radiates equally in all directions : 0 dBi Small lossless dipole: 1. The RF power transmitted by the antenna after transmitter to antenna cable losses have been allowed for. The amount by which the receiver noise equivalent noise referred to the antenna input exceeds the noise that would be generated by thermal noise in an otherwise noise-free receiver. This can range from fractions of a dB for microwave low noise downconverters through typically 2 to 10 dB for most receivers, and up to 30 or 40dB for test instruments such as a spectrum analyser.

This is the signal to noise ratio required for a specified performance level e. Receiver sensitivity receiver power is a calculated result rather than an input term. Sometimes it is desirable to use receiver sensitivity as an input parameter for a calculation.

This is the signal level that must be available from the transmitted signal to achieve the signal to noise ratio required by the signal demodulator. If you wish to use a receiver sensitivity figure, start off with the default values, look at the calculated receiver sensitivity, and modify one of the fundamental parameters T, B, S or N as described above so that the calculated receiver power is the same value as your specified receiver power.

If you know three of the parameters you should alter the remaining one to arrive at the receiver sensitivity. If you don't know the fundamental parameters, it doesn't really matter which one you alter as long at the resulting receiver power is the value you need to specify. Once you have set the minimum receiver power figure for the setup you are using, it should remain the same regardless of the path loss being calculated.

The difference between the minimum required receiver signal power, and the actually received signal power, gives you your signal margin.

The effective bandwidth for the overall baseband signal transmission path, normally dominated by the receiver filter bandwidth. In spread spectrum systems, this is the baseband bandwidth after despreading, not the spread signal bandwidth, as the despreading process allows most of the noise in the spread bandwidth to be filtered out before detection.

These heights, relative to a baseline, determine the relative position of the obstruction with respect to the line of sight between the transmitter and receiver antennas, and hence allow diffraction losses to be calculated. This distance is measured between the transmitter location and obstruction location points as projected on to the baseline.

This distance is measured between the obstruction location and receiver location points as projected on to the baseline. When you enter a nominal range, the Tx and Rx to obstruction distances are automatically scaled to add up to the nominal range. If you change one of the distances to the obstruction, the range will be modified assuming that the other distance to the obstruction is unchanged, and the nominal range must add up to the two distances to the obstruction.

The knife-edge diffraction loss is calculated from the distances entered as described above. The physics of this model assumes that the obstruction is an infinitely wide and deep sharp wedge, perpendicular to the propagation path.

An additional "excess loss" is calculated to allow for rounded obstructions; this excess loss also depends on whether the rounded obstruction is "smooth" or "rough" an example of a rough versus a smooth case is a forested hill as opposed to a grassy hill.

Caution: If the obstruction height is set very low negative or high compared to the line of sight, the algorithm used to calculate diffraction will run slowly the hourglass cursor may appear for some time. To assess paths without diffraction, simply read the results listed for no diffraction rather than setting a negative obstruction height.

A parameter sometimes quoted in connection with diffraction is the diffraction angle, which is calculated and listed on the text output window:. Intercept point is an extrapolated fictitious level of signals producing intermodulation and the intermodulation to the level where all are equal. This parameter is used to calculate intermodulation, blocking and spurious-free dynamic range results. For further information see: Results. Tx to obstruction distance: 22 km Rx to obstruction distance: 2 km Diffraction angle: 0.

Adjusting the hill height results in the angle 1. RFProp calculates the knife-edge diffraction loss to be Diffraction loss will be 6dB when the obstruction is directly in-line.

The excess loss for rounded obstructions is zero when the obstruction is below the line of sight. The rest of the parameters do not affect the required receiver power level, but determine the actual received power, which after subtracting the required receiver power gives the margin. An earth station is receiving transmissions from a space research satellite on a frequency of MHz.

The satellite is at a range of km and its transmitter supplies 0. Assuming free space propagation, and taking the impedance of free space as pi ohms, calculate. If the aerial at the earth station has a gain of 20dB with reference to an isotropic aerial, what is the signal power received?

Radio C, June Entering the values specified above, the following results are obtained in the text output window under "Actual received signal; no diffraction":. The maximum range, and path budget margin available at the specified nominal range, are displayed on the main graphical window.

The margin is displayed at the bottom of the main window together with the maximum feasible range. The amount of margin needed depends on unknown factors, and subjective factors such as how much confidence you have that all potential loss contributions have been accounted for and how well the propagation path has been characterised. A margin is normally required to account for potential variations in estimated loss factors outside known limits, unknowns that might not be accounted for, ageing of equipment, increasing cable losses due to wear and ageing, antenna losses etc.

More detailed results are available in the text output window, which can be saved to a file if required. This provides a complete reference for archival and documentation. Next, the diffraction parameters are listed.

The auxiliary parameter v is used in the evaluation of Fresnel integrals to calculate the knife-edge diffraction. The calculations will be accurate to around 0. The knife-edge diffraction loss is always 6. The loss increases rapidly as v increases negatively. The knife edge parameters d1 and d2 are not simply the distances from the antennas to the obstruction. The diffraction theory is based on the shape of the triangle joining the two antennas and the obstruction.

The distances d1 and d2 are the distances between the antennas and the perpendicular from the obstruction to the line joining the two antennas line of sight measured on the line of sight. The knife edge parameter h is the height of the perpendicular distance from the obstruction to the line of sight.

The Fresnel zone clearance is a distance between the obstruction and the line of sight joining the two antennas. The first Fresnel zone is the minimum distance at which the reflected signal path is a half wavelength longer than the direct path. Further Fresnel zones occur at integral multiples of a half wavelength path difference. The first Fresnel zone is the one listed here. Minimum clearance specifications to guarantee an "unobstructed" path can be set typically at around 0.

Note that this distance is relative to the line of sight, not the baseline. A list in tabular form shows the knife edge diffraction loss calculation, and the angle between the transmitted ray to the obstruction and the diffracted ray from the obstruction to the receiver positive angle means the path is obstructed, negative angle means the obstruction is not blocking the line of sight between the transmitter and receiver.

It also shows the correction factors, or excess losses, that allow the knife-edge theory to be adjusted for a more realistic rounded hill or obstruction. Correction factors are given for "rough" and "smooth" hills or obstructions.

A "rough hill" bends more signal through a given diffraction angle than a "smooth hill". The correction factors are attributed to K. According to J. Parsons, in "Land Mobile Radio Systems", Peter Peregrinus Chapter 2 , although strictly valid for horizontal polarization only, measurements have shown that at VHF and UHF Hacking's corrections can be applied to vertical polarisation with reasonable accuracy.

General propagation results are listed next. The T in this case is the noise temperature of the receiver:. The path loss is the component of signal attenuation between the transmitter and receiver that is attributed to the distance between the antennas. It is calculated as:. Note that this is independent of range law, i. Receiver power Min. This is the signal level that must be available from the transmitted signal when fading corresponds to the set margin, and all other transmitter and propagation path characteristics are accounted for.

Rx power density Min. Rx field strength Min. This parameter is often used in a broadcasting context. This parameter is used in satellite and space telemetry and other digital radio applications. Next, the receiver power, power density, field strength and margin are listed for the actual received signal excluding diffraction loss. The margin is the difference in dB between the actual received power and the minimum required receiver power.