Radio wave distribution is a very complex method. It is impossible to exactly predict how waves will spread and just what values we will calculate at some certain point. Therefore we involve some mathematical models in order to approximate radio propagation and to calculate discipline strength values according to predefined probability.

Your propagation model, that’s based on electromagnetic idea and on statistical analysis of both terrain features and radio stations measurements, predicts the particular median attenuation of the radio signal as a aim of distance and the variability of the signal with time and in space. Propagation models define shapes and formulas. Basic model we can forecast propagation in haphazard distance from the transmitter.

Using curves and precise formulas manually is definitely a tough task. In order to automate and speed up such calculations several software tools were created. Normally, radio planning software packages are used by tv producers, mobile operators and radio frequency authorities. Due to complexity and small number of potential customers, the price of this kind of software package can be rather high. But there is 1 exception to this tip.

Radio Mobile is a software tool for radio stations propagation calculation. Mcdougal has decided to publish this under the “freeware” license meaning the software is openly available on the web. This software is usually dedicated to amateur radio, however, it can be additionally used in other areas which includes broadcasting and specialist mobile communications.

Calculations are based on the Longley-Rice dissemination model. This is a standard purpose radio distribution model for frequencies between 20 MHz and 20 Ghz. In order to use the software additionally you need terrain design data. This information is needed for calculations involving effective heights that happen to be needed to perform distribution calculations. You can find a few terrain model info sources on the web. They offer free DTM (Digital Terrain Model) data that is enough to start working together with the Radio Mobile.

Radio stations Mobile supports a lot of fancy features like possibility to use DTM in several formats (DTED, SRTM), also in a lot of layers with different resolution, possibility to add map pictures in raster format (BMP, JPEG, GIF, TIFF, PNG), possibility to calculate interference between stereo and lots of functions to customize the view.

Basic means of use consists of coming into radio stations with all guidelines (if they are not moved into yet) and computation of the coverage. Right here you have a lot of options to customize the calculation and consider. Results can be rescued for later use. It is also very easy to define calculation step for coarse computations to save some time.

Pertaining to result display it is almost always not enough to display it on the gray range DTM. You would probably like to see this on some road. For this purpose you can use virtually any map picture along with known coordinates. The application allows you to enter harmonizes for each picture as a way to display it effectively over the DTM.

A very valuable function is the calculation of interference between radio stations. You establish protection ratio and minimum field strength for calculation and the software marks interference area with definite color.

The software is also very useful for micro-wave link planning. It allows you to display surfaces profile between 2 points, display of optical visibility from the point and formula of link guidelines. Although this software is totally free and dedicated regarding amateur radio it could be very useful tool with regard to daily radio communication tasks.

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